# $Id: 73_PRESENCE.pm 20782 2019-12-19 10:51:06Z markusbloch $
##############################################################################
#
#     73_PRESENCE.pm
#     Checks for the presence of a mobile phone or tablet by network ping or bluetooth detection.
#     It reports the presence of this device as state.
#
#     Copyright by Markus Bloch
#     e-mail: Notausstieg0309@googlemail.com
#
#     This file is part of fhem.
#
#     Fhem is free software: you can redistribute it and/or modify
#     it under the terms of the GNU General Public License as published by
#     the Free Software Foundation, either version 2 of the License, or
#     (at your option) any later version.
#
#     Fhem is distributed in the hope that it will be useful,
#     but WITHOUT ANY WARRANTY; without even the implied warranty of
#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#     GNU General Public License for more details.
#
#     You should have received a copy of the GNU General Public License
#     along with fhem.  If not, see <http://www.gnu.org/licenses/>.
#
##############################################################################

package main;

use strict;
use warnings;
use Blocking;
use Time::HiRes qw(gettimeofday usleep sleep);
use DevIo;

sub
PRESENCE_Initialize($)
{
    my ($hash) = @_;

    # Provider
    $hash->{ReadFn}   = "PRESENCE_Read";
    $hash->{ReadyFn}  = "PRESENCE_Ready";
    $hash->{SetFn}    = "PRESENCE_Set";
    $hash->{DefFn}    = "PRESENCE_Define";
    $hash->{NotifyFn} = "PRESENCE_Notify";
    $hash->{UndefFn}  = "PRESENCE_Undef";
    $hash->{AttrFn}   = "PRESENCE_Attr";
    $hash->{AttrList} = "do_not_notify:0,1 ".
                        "disable:0,1 ".
                        "disabledForIntervals ".
                        "fritzboxCheckSpeed:0,1 ".
                        "pingCount:1,2,3,4,5,6,7,8,9,10 ".
                        "bluetoothHciDevice ".
                        "absenceThreshold ".
                        "presenceThreshold ".
                        "absenceTimeout ".
                        "presenceTimeout ".
                        "powerCmd ".
                        "retryInterval ".
                        "retryCount ".
                        $readingFnAttributes;

    $hash->{AttrRenameMap} = { "ping_count" => "pingCount",
                               "bluetooth_hci_device" => "bluetoothHciDevice",
                               "fritzbox_speed" => "fritzboxCheckSpeed"
                             };

}

#####################################
sub
PRESENCE_Define($$)
{
    my ($hash, $def) = @_;
    my @a = split("[ \t]+", $def);
    my $dev;
    my $username =  getlogin || getpwuid($<) || "[unknown]";
    my $name = $hash->{NAME};

    $hash->{NOTIFYDEV} = "global";

    if(defined($a[2]) and defined($a[3]))
    {
        if($a[2] eq "local-bluetooth")
        {
            unless($a[3] =~ /^\s*([0-9a-fA-F]{2}:){5}[0-9a-fA-F]{2}\s*$/)
            {
                my $msg = "given address is not a bluetooth hardware address";
                Log 2, "PRESENCE ($name) - ".$msg;
                return $msg
            }

            $hash->{MODE} = "local-bluetooth";
            $hash->{ADDRESS} = $a[3];
            $hash->{INTERVAL_NORMAL} = (defined($a[4]) ? $a[4] : 30);
            $hash->{INTERVAL_PRESENT} = (defined($a[5]) ? $a[5] : $hash->{INTERVAL_NORMAL});
        }
        elsif($a[2] eq "fritzbox")
        {
            unless(-X "/usr/bin/ctlmgr_ctl")
            {
                my $msg = "this is not a fritzbox or you running FHEM with the AVM Beta Image. Please use the FHEM FritzBox Image from fhem.de";
                Log 2, "PRESENCE ($name) - ".$msg;
                return $msg;
            }

            unless($username eq "root")
            {
                my $msg = "FHEM is not running under root (currently $username) This check can only performed with root access to the FritzBox";
                Log 2, "PRESENCE ($name) - ".$msg;
                return $msg;
            }

            $hash->{MODE} = "fritzbox";
            $hash->{ADDRESS} = $a[3];
            $hash->{INTERVAL_NORMAL} = (defined($a[4]) ? $a[4] : 30);
            $hash->{INTERVAL_PRESENT} = (defined($a[5]) ? $a[5] : $hash->{INTERVAL_NORMAL});
        }
        elsif($a[2] eq "lan-ping")
        {
            if(-X "/usr/bin/ctlmgr_ctl" and not $username eq "root")
            {
                my $msg = "FHEM is not running under root (currently $username) This check can only performed with root access to the FritzBox";
                Log 2, "PRESENCE ($name) - ".$msg;
                return $msg;
            }

            $hash->{MODE} = "lan-ping";
            $hash->{ADDRESS} = $a[3];
            $hash->{INTERVAL_NORMAL} = (defined($a[4]) ? $a[4] : 30);
            $hash->{INTERVAL_PRESENT} = (defined($a[5]) ? $a[5] : $hash->{INTERVAL_NORMAL});
        }
        elsif($a[2] =~ /(shellscript|function)/)
        {
            if($def =~ /(\S+) \w+ (\S+) ["']{0,1}(.+?)['"]{0,1}\s*(\d*)\s*(\d*)$/s)
            {
                $hash->{MODE} = $2;
                $hash->{helper}{call} = $3;
                $hash->{INTERVAL_NORMAL} = ($4 ne "" ? $4 : 30);
                $hash->{INTERVAL_PRESENT} = ($5 ne "" ? $5 : $hash->{INTERVAL_NORMAL});

                delete($hash->{helper}{ADDRESS});

                if($hash->{helper}{call} =~ /\|/)
                {
                    my $msg = "The command contains a pipe ( | ) symbol, which is not allowed.";
                    Log 2, "PRESENCE ($name) - ".$msg;
                    return $msg;
                }

                if($hash->{MODE} eq "function" and not $hash->{helper}{call} =~ /^\{.+\}$/)
                {
                    my $msg = "The function call must be encapsulated by brackets ( {...} ).";
                    Log 2, "PRESENCE ($name) - ".$msg;
                    return $msg;
                }
            }
        }
        elsif($a[2] eq "lan-bluetooth")
        {
            unless($a[3] =~ /^\s*([0-9a-fA-F]{2}:){5}[0-9a-fA-F]{2}\s*$/)
            {
                my $msg = "given address is not a bluetooth hardware address";
                Log 2, "PRESENCE ($name) - ".$msg;
                return $msg
            }

            DevIo_CloseDev($hash);

            $hash->{MODE} = "lan-bluetooth";
            $hash->{ADDRESS} = $a[3];
            $hash->{INTERVAL_NORMAL} = (defined($a[5]) ? $a[5] : 30);
            $hash->{INTERVAL_PRESENT} = (defined($a[6]) ? $a[6] : $hash->{INTERVAL_NORMAL});

            $dev = $a[4];
            $dev .= ":5222" if($dev !~ m/:/ && $dev ne "none" && $dev !~ m/\@/);

            $hash->{DeviceName} = $dev;
        }
        elsif($a[2] eq "event")
        {
            return "missing arguments for mode event. You need to provide two event regexp" unless(defined($a[4]));

            eval { qr/^$a[3]$/ };
            return "invalid absent regexp: $@" if($@);

            eval { qr/^$a[4]$/ };
            return "invalid present regexp: $@" if($@);

            $hash->{MODE} = "event";
            $hash->{EVENT_ABSENT} = $a[3];
            $hash->{EVENT_PRESENT} = $a[4];
            $hash->{STATE} = "Initialized" if($init_done);

            InternalTimer(gettimeofday(), "PRESENCE_setNotfiyDev", $hash);
        }
        else
        {
            my $msg = "unknown mode \"".$a[2]."\" in define statement: Please use lan-ping, lan-bluetooth, local-bluetooth, fritzbox, shellscript, function or event";
            Log 2, "PRESENCE ($name) - ".$msg;
            return $msg
        }
    }
    else
    {
        my $msg = "wrong syntax for define statement: define <name> PRESENCE <mode> <device-address> [ <check-interval> [ <present-check-interval> ] ]";
        Log 2, "PRESENCE ($name) - $msg";
        return $msg;
    }

    my $timeout = $hash->{INTERVAL_NORMAL};
    my $presence_timeout = $hash->{INTERVAL_PRESENT};

    if(defined($timeout) and not $timeout =~ /^\d+$/)
    {
        my $msg = "check-interval must be a number";
        Log 2, "PRESENCE ($name) - ".$msg;
        return $msg;
    }

    if(defined($timeout) and not $timeout > 0)
    {
        my $msg = "check-interval must be greater than zero";
        Log 2, "PRESENCE ($name) -".$msg;
        return $msg;
    }

    if(defined($presence_timeout) and not $presence_timeout =~ /^\d+$/)
    {
        my $msg = "presence-check-interval must be a number";
        Log 2, "PRESENCE ($name) - ".$msg;
        return $msg;
    }

    if(defined($presence_timeout) and not $presence_timeout > 0)
    {
        my $msg = "presence-check-interval must be greater than zero";
        Log 2, "PRESENCE ($name) - ".$msg;
        return $msg;
    }

    delete($hash->{helper}{cachednr});

    readingsSingleUpdate($hash,"model",$hash->{MODE},0);

    return undef;
}

#####################################
sub
PRESENCE_Undef($$)
{
    my ($hash, $arg) = @_;

    RemoveInternalTimer($hash);

    if(defined($hash->{helper}{RUNNING_PID}))
    {
        BlockingKill($hash->{helper}{RUNNING_PID});
    }

    DevIo_CloseDev($hash);
    return undef;
}

#####################################
sub
PRESENCE_Notify($$)
{
    my ($hash,$dev) = @_;

    return undef if(!defined($hash) or !defined($dev));

    my $name = $hash->{NAME};
    my $dev_name = $dev->{NAME};

    return undef if(!defined($dev_name) or !defined($name));

    my $events = deviceEvents($dev,0);

    if($dev_name eq "global" and grep(m/^(?:DEFINED $name|MODIFIED $name|INITIALIZED|REREADCFG)$/, @{$events}))
    {
        if(grep(m/^(?:INITIALIZED|REREADCFG)$/, @{$events}))
        {
            $hash->{helper}{ABSENT_COUNT} = int(ReadingsVal($name, ".absenceThresholdCounter", 0));
            $hash->{helper}{PRESENT_COUNT} = int(ReadingsVal($name, ".presenceThresholdCounter", 0));
        }

        if($hash->{MODE} =~ /(lan-ping|local-bluetooth|fritzbox|shellscript|function)/)
        {
            delete $hash->{helper}{RUNNING_PID} if(defined($hash->{helper}{RUNNING_PID}));
            RemoveInternalTimer($hash);
            InternalTimer(gettimeofday(), "PRESENCE_StartLocalScan", $hash, 0) unless($hash->{helper}{DISABLED});
            return undef;
        }
        elsif($hash->{MODE} eq "lan-bluetooth")
        {
            delete($hash->{NEXT_OPEN}) if(exists($hash->{NEXT_OPEN}));
            return DevIo_OpenDev($hash, 0, "PRESENCE_DoInit");
        }
    }
    elsif($hash->{MODE} eq "event")
    {
        return undef if($hash->{helper}{DISABLED});

        my $re_present = $hash->{EVENT_PRESENT};
        my $re_absent = $hash->{EVENT_ABSENT};

        Log3 $name, 5, "PRESENCE ($name) - processing events from $dev_name";
        foreach my $event (@{$events})
        {
            if($dev_name =~ m/^$re_present$/ or "$dev_name:$event" =~ m/^$re_present$/)
            {
                Log3 $name, 5, "PRESENCE ($name) - $dev_name:$event matched present regexp";
                readingsBeginUpdate($hash);
                PRESENCE_ProcessState($hash, "present");
                readingsEndUpdate($hash, 1);
            }
            elsif($dev_name =~ m/^$re_absent$/ or "$dev_name:$event" =~ m/^$re_absent$/)
            {
                Log3 $name, 5, "PRESENCE ($name) - $dev_name:$event matched absent regexp";
                readingsBeginUpdate($hash);
                PRESENCE_ProcessState($hash, "absent");
                readingsEndUpdate($hash, 1);
            }
        }
    }
}

#####################################
sub
PRESENCE_Set($@)
{
    my ($hash, @a) = @_;
    my $name = $hash->{NAME};

    return "No Argument given" if(!defined($a[1]));

    my $usage = "Unknown argument ".$a[1].", choose one of statusRequest";

    my $powerCmd = AttrVal($name, "powerCmd", undef);
    $usage .= " power" if(defined($powerCmd));

    $usage .= " overrideInterval" if($hash->{MODE} !~ /^event|lan-bluetooth$/);
    $usage .= " clearOverride:noArg" if($hash->{INTERVAL_OVERRIDED});
    $usage .= " inactive:noArg active:noArg";

    if($a[1] eq "statusRequest")
    {
        if($hash->{MODE} ne "lan-bluetooth")
        {
            Log3 $name, 5, "PRESENCE ($name) - starting local scan";

            return PRESENCE_StartLocalScan($hash, 1);
        }
        else
        {
            if(exists($hash->{FD}))
            {
                DevIo_SimpleWrite($hash, "now\n", 2);
            }
            else
            {
                return "PRESENCE Definition \"$name\" is not connected to ".$hash->{DeviceName};
            }
        }
    }
    elsif(defined($powerCmd) && $a[1] eq "power")
    {
        my %specials= (
        '%NAME' => $name,
        '%ADDRESS' => (defined($hash->{ADDRESS}) ? $hash->{ADDRESS} : ""),
        '%ARGUMENT' => (defined($a[2]) ? $a[2] : "")
        );

        $powerCmd = EvalSpecials($powerCmd, %specials);

        Log3 $name, 5, "PRESENCE ($name) - executing powerCmd: $powerCmd";
        my $return = AnalyzeCommandChain(undef, $powerCmd);

        if($return)
        {
            Log3 $name, 3, "PRESENCE ($name) - executed powerCmd failed: ".$return;
            readingsSingleUpdate($hash, "powerCmd", "failed",1);
            return "executed powerCmd failed: ".$return;
        }
        else
        {
            readingsSingleUpdate($hash, "powerCmd", "executed",1);
        }
    }
    elsif($a[1] eq "overrideInterval")
    {
        if($a[2] and $a[2] =~ /^\d+$/)
        {
            Log3 $name, 3, "PRESENCE ($name) - overriding regular check intervals to ".$a[2]." seconds";
            $hash->{INTERVAL_OVERRIDED} = $a[2];
        }
        else
        {
            return "invalid override interval given (must be a positive integer)"
        }
    }
    elsif($a[1] eq "clearOverride")
    {
        delete($hash->{INTERVAL_OVERRIDED});
    }
    elsif($a[1] eq "inactive")
    {
        if(defined($hash->{FD}))
        {
            DevIo_SimpleWrite($hash, "stop\n", 2);
        }
        RemoveInternalTimer($hash);
        $hash->{helper}{DISABLED} = 1;
        readingsSingleUpdate($hash, "state", "disabled",1);
    }
    elsif($a[1] eq "active")
    {
        readingsSingleUpdate($hash, "state", "defined",0) if(exists($hash->{helper}{DISABLED}) and $hash->{helper}{DISABLED} == 1);

        if(defined($hash->{DeviceName}))
        {
            $hash->{helper}{DISABLED} = 0;

            if(defined($hash->{FD}))
            {
                PRESENCE_DoInit($hash) if(exists($hash->{helper}{DISABLED}));
            }
            else
            {
                DevIo_OpenDev($hash, 0, "PRESENCE_DoInit");
            }
        }
        else
        {
            $hash->{helper}{DISABLED} = 0;
            PRESENCE_StartLocalScan($hash);
        }

    }
    else
    {
        return $usage;
    }

    return undef;
}


##########################
sub
PRESENCE_Attr(@)
{
    my @a = @_;
    my $hash = $defs{$a[1]};

    if($a[0] eq "set" && $a[2] eq "disable")
    {
        if($a[3] eq "0")
        {
            readingsSingleUpdate($hash, "state", "defined",0) if(exists($hash->{helper}{DISABLED}) and $hash->{helper}{DISABLED} == 1);

            if(defined($hash->{DeviceName}))
            {
                $hash->{helper}{DISABLED} = 0;

                if(defined($hash->{FD}))
                {
                    PRESENCE_DoInit($hash) if(exists($hash->{helper}{DISABLED}));

                }
                else
                {
                    DevIo_OpenDev($hash, 0, "PRESENCE_DoInit");
                }
            }
            else
            {
                $hash->{helper}{DISABLED} = 0;
                PRESENCE_StartLocalScan($hash);
            }

            $hash->{helper}{DISABLED} = 0;
        }
        elsif($a[3] eq "1")
        {
            if(defined($hash->{FD}))
            {
                DevIo_SimpleWrite($hash, "stop\n", 2);
            }

            RemoveInternalTimer($hash);

            $hash->{helper}{DISABLED} = 1;
            readingsSingleUpdate($hash, "state", "disabled",1);
        }
    }
    elsif($a[0] eq "del" && $a[2] eq "disable")
    {
        readingsSingleUpdate($hash, "state", "defined",0) if(exists($hash->{helper}{DISABLED}) and $hash->{helper}{DISABLED} == 1);

        if(defined($hash->{DeviceName}))
        {
            $hash->{helper}{DISABLED} = 0;

            if(defined($hash->{FD}))
            {
                PRESENCE_DoInit($hash) if(exists($hash->{helper}{DISABLED}));
            }
            else
            {
                DevIo_OpenDev($hash, 0, "PRESENCE_DoInit");
            }
        }
        else
        {
            $hash->{helper}{DISABLED} = 0;
            PRESENCE_StartLocalScan($hash);
        }
    }
    elsif($a[0] eq "set" and $a[2] eq "powerOnFn")
    {
        my $powerOnFn = $a[3];

        $powerOnFn =~ s/^\s+//;
        $powerOnFn =~ s/\s+$//;

        if($powerOnFn eq "")
        {
            return "powerOnFn contains no value";
        }
    }
    elsif($a[0] eq "set" and $a[2] eq "absenceThreshold")
    {
        return $a[2]." must be a valid integer number" if($a[3] !~ /^\d+$/);
        return $a[2]." is not applicable for mode 'event'" if($hash->{MODE} eq "event");
    }
    elsif($a[0] eq "set" and $a[2] eq "presenceThreshold")
    {
        return $a[2]." must be a valid integer number" if($a[3] !~ /^\d+$/);
        return $a[2]." is not applicable for mode 'event'" if($hash->{MODE} eq "event");
    }
    elsif($a[0] eq "set" and $a[2] eq "absenceTimeout")
    {
        return $a[2]." is only applicable for mode 'event'" if($hash->{MODE} ne "event");

        if($a[3] !~ /^\d?\d(?::\d\d){0,2}$/)
        {
            return "not a valid time frame value. See commandref for the correct syntax.";
        }
    }
    elsif($a[0] eq "set" and $a[2] eq "presenceTimeout")
    {
        return $a[2]." is only applicable for mode 'event'" if($hash->{MODE} ne "event");

        if($a[3] !~ /^\d?\d(?::\d\d){0,2}$/)
        {
            return "not a valid time frame value. See commandref for the correct syntax.";
        }
    }
    elsif($a[0] eq "set" and $a[2] =~ /^(retryInterval|retryCount)$/)
    {
        return $a[2]." must be a valid positive integer number" if($a[3] !~ /^\d+$/);
        return $a[2]." is not applicable for mode '".$hash->{MODE}."'" if($hash->{MODE} =~ /^(event|lan-bluetooth)$/);
    }
    
    return undef;
}


#####################################
# Receives an event and creates several readings for event triggering
sub
PRESENCE_Read($)
{
    my ($hash) = @_;
    my $name = $hash->{NAME};
    my $buf = DevIo_SimpleRead($hash);
    return "" if(!defined($buf));

    chomp $buf;

    readingsBeginUpdate($hash);

    for my $line (split /^/, $buf)
    {
        Log3 $name, 5, "PRESENCE ($name) - received data: $line";

        if($line =~ /^absence|absent/)
        {
            if(!$hash->{helper}{DISABLED} and $hash->{helper}{CURRENT_TIMEOUT} eq "present" and $hash->{INTERVAL_NORMAL} != $hash->{INTERVAL_PRESENT})
            {
                $hash->{helper}{CURRENT_TIMEOUT} = "normal";
                Log3 $name, 4 , "PRESENCE ($name) - changing to normal timeout every ".$hash->{INTERVAL_NORMAL}." seconds";
                DevIo_SimpleWrite($hash, $hash->{ADDRESS}."|".$hash->{INTERVAL_NORMAL}."\n", 2);
            }

            unless($hash->{helper}{DISABLED})
            {
                PRESENCE_ProcessState($hash, "absent");

                if($line=~ /^[^;]+;(.+)$/)
                {
                    PRESENCE_ProcessAddonData($hash, $1);
                }
            }
        }
        elsif($line =~ /present;(.+?)$/)
        {
            if(!$hash->{helper}{DISABLED} and $hash->{helper}{CURRENT_TIMEOUT} eq "normal" and $hash->{INTERVAL_NORMAL} != $hash->{INTERVAL_PRESENT})
            {
                $hash->{helper}{CURRENT_TIMEOUT} = "present";
                Log3 $name, 4 , "PRESENCE ($name) - changing to present timeout every ".$hash->{INTERVAL_PRESENT}." seconds";
                DevIo_SimpleWrite($hash, $hash->{ADDRESS}."|".$hash->{INTERVAL_PRESENT}."\n", 2);
            }

            unless($hash->{helper}{DISABLED})
            {
                PRESENCE_ProcessState($hash, "present");
                my $data = $1;

                if($data =~ /\S=\S/)
                {
                    PRESENCE_ProcessAddonData($hash, $data);
                }
                else
                {
                    if($1 =~ /^(.*);(.+)$/)
                    {
                        readingsBulkUpdate($hash, "room", $2);
                        readingsBulkUpdate($hash, "device_name", $1);
                    }
                    else
                    {
                        readingsBulkUpdate($hash, "device_name", $1);
                    }
                }
            }
        }
        elsif($line eq "command accepted")
        {
            readingsBulkUpdate($hash, "command_accepted", "yes");
        }
        elsif($line eq "command rejected")
        {
            readingsBulkUpdate($hash, "command_accepted", "no");
        }
        elsif($line =~ /socket_closed;(?:room='?)?(.+?)'?$/)
        {
            Log3 $name, 3, "PRESENCE ($name) - collectord lost connection to room $1";
        }
        elsif($line =~ /socket_reconnected;(?:room='?)?(.+?)'?$/)
        {
            Log3 $name , 3, "PRESENCE ($name) - collectord reconnected to room $1";
        }
        elsif($line =~ /error;(?:room='?)?(.+?)'?$/)
        {
            Log3 $name, 3, "PRESENCE ($name) - room $1 cannot execute hcitool to check device";
        }
        elsif($line =~ /error$/)
        {
            Log3 $name, 3, "PRESENCE ($name) - presenced cannot execute hcitool to check device ";
        }
    }

    readingsEndUpdate($hash, 1);
}

#####################################
sub
PRESENCE_Ready($)
{
    my ($hash) = @_;

    return DevIo_OpenDev($hash, 1, "PRESENCE_DoInit") if($hash->{MODE} eq "lan-bluetooth");
}


##########################################################################################################################
#
#  Functions for local testing with Blocking.pm to ensure a smooth FHEM processing
#
##########################################################################################################################

#####################################
sub PRESENCE_StartLocalScan($;$)
{
    my ($hash, $local) = @_;
    my $name = $hash->{NAME};
    my $mode = $hash->{MODE};

    $local = 0 unless(defined($local));

    if(not (exists($hash->{ADDRESS}) or exists($hash->{helper}{call})))
    {
        return undef;
    }

    unless(exists($hash->{helper}{RUNNING_PID}))
    {
        $hash->{STATE} = "active" if($hash->{STATE} eq "???" or $hash->{STATE} eq "defined");

        if($local == 0)
        {
            Log3 $name, 5, "PRESENCE ($name) - stopping timer";
            RemoveInternalTimer($hash);
        }

        if($mode eq "local-bluetooth")
        {
            Log3 $name, 5, "PRESENCE ($name) - starting blocking call for mode local-bluetooth";
            $hash->{helper}{RUNNING_PID} = BlockingCall("PRESENCE_DoLocalBluetoothScan", $name."|".$hash->{ADDRESS}."|".$local."|".AttrVal($name, "bluetoothHciDevice", ""), "PRESENCE_ProcessLocalScan", 60, "PRESENCE_ProcessAbortedScan", $hash);
        }
        elsif($mode eq "lan-ping")
        {
            Log3 $name, 5, "PRESENCE ($name) - starting blocking call for mode lan-ping";
            $hash->{helper}{RUNNING_PID} = BlockingCall("PRESENCE_DoLocalPingScan", $name."|".$hash->{ADDRESS}."|".$local."|".AttrVal($name, "pingCount", "4"), "PRESENCE_ProcessLocalScan", 60, "PRESENCE_ProcessAbortedScan", $hash);
        }
        elsif($mode eq "fritzbox")
        {
            Log3 $name, 5, "PRESENCE ($name) - starting blocking call for mode fritzbox";
            $hash->{helper}{RUNNING_PID} = BlockingCall("PRESENCE_DoLocalFritzBoxScan", $name."|".$hash->{ADDRESS}."|".$local."|".AttrVal($name, "fritzboxCheckSpeed", "0"), "PRESENCE_ProcessLocalScan", 60, "PRESENCE_ProcessAbortedScan", $hash);
        }
        elsif($mode eq "shellscript")
        {
            Log3 $name, 5, "PRESENCE ($name) - starting blocking call for mode shellscript";
            $hash->{helper}{RUNNING_PID} = BlockingCall("PRESENCE_DoLocalShellScriptScan", $name."|".$hash->{helper}{call}."|".$local, "PRESENCE_ProcessLocalScan", 60, "PRESENCE_ProcessAbortedScan", $hash);
        }
        elsif($mode eq "function")
        {
            Log3 $name, 5, "PRESENCE ($name) - starting blocking call for mode function";
            $hash->{helper}{RUNNING_PID} = BlockingCall("PRESENCE_DoLocalFunctionScan", $name."|".$hash->{helper}{call}."|".$local, "PRESENCE_ProcessLocalScan", 60, "PRESENCE_ProcessAbortedScan", $hash);
        }

        if(!$hash->{helper}{RUNNING_PID} and $mode =~ /^local-bluetooth|lan-ping|fritzbox|shellscript|function$/)
        {
            delete($hash->{helper}{RUNNING_PID});

            my $seconds = (ReadingsVal($name, "state", "absent") eq "present" ? $hash->{INTERVAL_PRESENT} : $hash->{INTERVAL_NORMAL});

            Log3 $hash->{NAME}, 4, "PRESENCE ($name) - fork failed, rescheduling next check in $seconds seconds";

            RemoveInternalTimer($hash);
            InternalTimer(gettimeofday()+$seconds, "PRESENCE_StartLocalScan", $hash, 0) unless($hash->{helper}{DISABLED});
        }

        return undef;
    }
    else
    {
        Log3 $hash->{NAME}, 4, "PRESENCE ($name) - another check is currently running. skipping check";

        if($local == 0)
        {
            my $seconds = (ReadingsVal($name, "state", "absent") eq "present" ? $hash->{INTERVAL_PRESENT} : $hash->{INTERVAL_NORMAL});

            Log3 $hash->{NAME}, 4, "PRESENCE ($name) - rescheduling next check in $seconds seconds";

            RemoveInternalTimer($hash);
            InternalTimer(gettimeofday()+$seconds, "PRESENCE_StartLocalScan", $hash, 0) unless($hash->{helper}{DISABLED});
        }

        return "another check is currently running";
    }
}

#####################################
sub PRESENCE_DoLocalPingScan($)
{

    my ($string) = @_;
    my ($name, $device, $local, $count) = split("\\|", $string);

    Log3 $name, 5, "PRESENCE ($name) - starting ping scan: $string";

    my $retcode;
    my $return;
    my $temp;

    $SIG{CHLD} = 'IGNORE';

    if($^O =~ m/(Win|cygwin)/)
    {
        $temp = qx(ping -n $count -4 $device);

        if(defined($temp) and $temp ne "")
        {
            chomp $temp;
            Log3 $name, 5, "PRESENCE ($name) - ping command returned with output:\n$temp";
            $return = "$name|$local|".($temp =~ /TTL=\d+/ ? "present" : "absent");
        }
        else
        {
            $return = "$name|$local|error|Could not execute ping command: \"ping -n $count -4 $device\"";
        }
    }
    elsif($^O =~ m/solaris/)
    {
        $temp = qx(ping $device 4);

        if(defined($temp) and $temp ne "")
        {
            chomp $temp;
            Log3 $name, 5, "PRESENCE ($name) - ping command returned with output:\n$temp";
            $return = "$name|$local|".($temp =~ /is alive/ ? "present" : "absent");
        }
        else
        {
            $return = "$name|$local|error|Could not execute ping command: \"ping -n $count -4 $device\"";
        }

    }
    else
    {
        $temp = qx(ping -c $count $device 2>&1);

        if(defined($temp) and $temp ne "")
        {
            chomp $temp;
            Log3 $name, 5, "PRESENCE ($name) - ping command returned with output:\n$temp";
            $return = "$name|$local|".(($temp =~ /\d+ [Bb]ytes (from|von)/ and not $temp =~ /[Uu]nreachable/) ? "present" : "absent");
        }
        else
        {
            $return = "$name|$local|error|Could not execute ping command: \"ping -c $count $device\"";
        }
    }

    return $return;
}

#####################################
sub PRESENCE_ExecuteFritzBoxCMD($$)
{

    my ($name, $cmd) = @_;
    my $status;
    my $wait;

    while(-e "/var/tmp/fhem-PRESENCE-cmd-lock.tmp" and (stat("/var/tmp/fhem-PRESENCE-cmd-lock.tmp"))[9] > (gettimeofday() - 2))
    {
        $wait = int(rand(4))+2;
        Log3 $name, 5, "PRESENCE ($name) - ctlmgr_ctl is locked. waiting $wait seconds...";
        $wait = 1000000*$wait;
        usleep $wait;
    }

    unlink("/var/tmp/fhem-PRESENCE-cmd-lock.tmp") if(-e "/var/tmp/fhem-PRESENCE-cmd-lock.tmp");

    qx(touch /var/tmp/fhem-PRESENCE-cmd-lock.tmp);

    Log3 $name, 5, "PRESENCE ($name) - executing ctlmgr_ctl: $cmd";
    $status = qx($cmd);
    usleep 200000;
    unlink("/var/tmp/fhem-PRESENCE-cmd-lock.tmp") if(-e "/var/tmp/fhem-PRESENCE-cmd-lock.tmp");

    return $status;
}

#####################################
sub PRESENCE_DoLocalFritzBoxScan($)
{
    my ($string) = @_;
    my ($name, $device, $local, $speedcheck) = split("\\|", $string);

    Log3 $name, 5, "PRESENCE ($name) - starting fritzbox scan: $string";

    my $number = 0;
    my $status = 0;
    my $speed;

    $SIG{CHLD} = 'IGNORE';

    my $check_command = ($device =~ /^\s*([0-9a-fA-F]{2}:){5}[0-9a-fA-F]{2}\s*$/ ? "mac" : "name");

    $device = uc $device if($device =~ /^\s*([0-9a-fA-F]{2}:){5}[0-9a-fA-F]{2}\s*$/);

    if(defined($defs{$name}{helper}{cachednr}))
    {
        $number = $defs{$name}{helper}{cachednr};

        Log3 $name, 5, "PRESENCE ($name) - try checking $name as device $device with cached number $number";
        my $cached_name = "";

        $cached_name = PRESENCE_ExecuteFritzBoxCMD($name, "/usr/bin/ctlmgr_ctl r landevice settings/landevice$number/$check_command");

        chomp $cached_name;

        # only use the cached $number if it has still the correct device name
        if($cached_name eq $device)
        {
            Log3 $name, 5, "PRESENCE ($name) - checking state with cached number ($number)";
            $status = PRESENCE_ExecuteFritzBoxCMD($name, "/usr/bin/ctlmgr_ctl r landevice settings/landevice$number/active");
            chomp $status;

            if($status ne "0" and $speedcheck eq "1")
            {
                $speed = PRESENCE_ExecuteFritzBoxCMD($name, "/usr/bin/ctlmgr_ctl r landevice settings/landevice$number/speed");
                chomp $speed;
                Log3 $name, 5, "PRESENCE ($name) - speed check returned: $speed";
                $speed = undef if($speed eq "0");
            }

            Log3 $name, 5, "PRESENCE ($name) - ctlmgr_ctl (cached: $number) returned: $status";

            if(not $status =~ /^\s*\d+\s*$/)
            {
                return "$name|$local|error|could not execute ctlmgr_ctl (cached)";
            }

            return ($status == 0 ? "$name|$local|absent|$number" : "$name|$local|present|$number").($speedcheck == 1 and defined($speed) ? "|$speed" :"");
        }
        else
        {
            Log3 $name, 5, "PRESENCE ($name) - cached device ($cached_name) does not match expected device ($device). perform a full scan";
        }
    }

    my $max = PRESENCE_ExecuteFritzBoxCMD($name, "/usr/bin/ctlmgr_ctl r landevice settings/landevice/count");

    chomp $max;

    Log3 $name, 5, "PRESENCE ($name) - ctlmgr_ctl (getting device count) returned: $max";

    if(not $max =~ /^\s*\d+\s*$/)
    {
        return "$name|$local|error|could not execute ctlmgr_ctl";
    }

    my $net_device;

    $number = 0;

    while($number <= $max)
    {
        $net_device = PRESENCE_ExecuteFritzBoxCMD($name, "/usr/bin/ctlmgr_ctl r landevice settings/landevice$number/$check_command");

        chomp $net_device;

        Log3 $name, 5, "PRESENCE ($name) - checking device number $number ($net_device)";

        if($net_device eq $device)
        {
            $status = PRESENCE_ExecuteFritzBoxCMD($name, "/usr/bin/ctlmgr_ctl r landevice settings/landevice$number/active");
            chomp $status;

            if($status ne "0" and $speedcheck eq "1")
            {
                $speed = PRESENCE_ExecuteFritzBoxCMD($name, "/usr/bin/ctlmgr_ctl r landevice settings/landevice$number/speed");
                chomp $speed;
                Log3 $name, 5, "PRESENCE ($name) - speed check returned: $speed";
                $speed = undef if($speed eq "0");
            }

            Log3 $name, 5, "PRESENCE ($name) - state for device number $net_device is $status";

            last;
        }

        $number++;
    }

    return ($status == 0 ? "$name|$local|absent" : "$name|$local|present").($number <= $max ? "|$number" : "|").($speedcheck == 1 and defined($speed) ? "|$speed" : "");
}

#####################################
sub PRESENCE_DoLocalBluetoothScan($)
{
    my ($string) = @_;
    my ($name, $device, $local, $btdevice) = split("\\|", $string);

    my $devname;
    my $return;
    my $wait = 1;
    my $ps;
    my $psargs = "ax";

    Log3 $name, 5, "PRESENCE ($name) - starting bluetooth scan: $string";

    $SIG{CHLD} = 'IGNORE';

    if(qx(ps --help 2>&1) =~ /BusyBox/g)
    {
        Log3 $name, 5, "PRESENCE ($name) - found busybox variant of ps command, using \"w\" as parameter";
        $psargs = "w";
    }
    else
    {
        Log3 $name, 5, "PRESENCE ($name) - found standard variant of ps command, using \"ax\" as parameter";
        $psargs = "ax";
    }

    Log3 $name, 4, "PRESENCE ($name) - executing: which hcitool";
    my $hcitool = qx(which hcitool);
    Log3 $name, 4, "PRESENCE ($name) - 'which hcitool' returns: $hcitool";
    chomp $hcitool;

    if(-x $hcitool)
    {
        my $options = ($btdevice ? "-i $btdevice" : "");

        while($wait)
        {   # check if another hcitool process is running
            $ps = qx(ps $psargs | grep hcitool | grep -v grep);
            if(not $ps =~ /^\s*$/)
            {
                # sleep between 1 and 5 seconds and try again
                Log3 $name, 5, "PRESENCE ($name) - another hcitool command is running. waiting...";
                sleep(rand(4)+1);
            }
            else
            {
                $wait = 0;
            }
        }

        Log3 $name, 5, "PRESENCE ($name) - executing: hcitool name $device";
        $devname = qx(hcitool $options name $device);

        chomp($devname);
        Log3 $name, 4, "PRESENCE ($name) - hcitool returned: $devname";

        if(not $devname =~ /^\s*$/)
        {
            $return = "$name|$local|present|$devname";
        }
        else
        {
            $return = "$name|$local|absent";
        }
    }
    else
    {
        $return = "$name|$local|error|no hcitool binary found. Please check that the bluez-package is properly installed";
    }

    return $return;
}

#####################################
sub PRESENCE_DoLocalShellScriptScan($)
{

    my ($string) = @_;
    my ($name, $call, $local) = split("\\|", $string);

    my $ret;
    my $return;

    Log3 $name, 5, "PRESENCE ($name) - starting local shell script scan: $string";

    $SIG{CHLD} = 'IGNORE';

    $ret = qx($call 2>&1);

    if(defined($ret))
    {
        chomp $ret;
        Log3 $name, 5, "PRESENCE ($name) - script output: $ret";
    }

    if(not defined($ret))
    {
        $return = "$name|$local|error|scriptcall doesn't return any output";
    }
    elsif($ret eq "1")
    {
        $return = "$name|$local|present";
    }
    elsif($ret eq "0")
    {
        $return = "$name|$local|absent";
    }
    else
    {
        $ret =~ s/\n/<<line-break>>/g;

        $return = "$name|$local|error|unexpected script output (expected 0 or 1): $ret";
    }

    return $return;
}

#####################################
sub PRESENCE_DoLocalFunctionScan($)
{

    my ($string) = @_;
    my ($name, $call, $local) = split("\\|", $string);

    my $ret;
    my $return;

    Log3 $name, 5, "PRESENCE ($name) - execute perl function: $string";

    $SIG{CHLD} = 'IGNORE';

    $ret = AnalyzeCommandChain(undef, $call);

    chomp $ret;

    Log3 $name, 5, "PRESENCE ($name) - function returned with: $ret";

    if(not defined($ret))
    {
        $return = "$name|$local|error|function call doesn't return any output";
    }
    elsif($ret eq "1")
    {
        $return = "$name|$local|present";
    }
    elsif($ret eq "0")
    {
        $return = "$name|$local|absent";
    }
    else
    {
        $ret =~ s/\n/<<line-break>>/g;

        $return = "$name|$local|error|unexpected function output (expected 0 or 1): $ret";
    }

    return $return;
}

#####################################
sub PRESENCE_ProcessLocalScan($)
{
    my ($string) = @_;

    return unless(defined($string));

    my @a = split("\\|",$string);
    my $hash = $defs{$a[0]};

    my $local = $a[1];
    my $name = $hash->{NAME};

    Log3 $hash->{NAME}, 5, "PRESENCE ($name) - blocking scan result: $string";

    delete($hash->{helper}{RUNNING_PID});

    if($hash->{helper}{DISABLED})
    {
        Log3 $hash->{NAME}, 5, "PRESENCE ($name) - don't process the scan result, as $name is disabled";
        return;
    }

    if(defined($hash->{helper}{RETRY_COUNT}))
    {
        Log3 $hash->{NAME}, 2, "PRESENCE ($name) - check returned a valid result after ".$hash->{helper}{RETRY_COUNT}." unsuccesful ".($hash->{helper}{RETRY_COUNT} > 1 ? "retries" : "retry");
        delete($hash->{helper}{RETRY_COUNT});
    }

    if($hash->{MODE} eq "fritzbox" and defined($a[3]) and $a[3] ne "")
    {
        $hash->{helper}{cachednr} = $a[3] if(($a[2] eq "present") || ($a[2] eq "absent"));
    }
    elsif($hash->{MODE} eq "fritzbox" and defined($hash->{helper}{cachednr}))
    {
        delete($hash->{helper}{cachednr});
    }

    readingsBeginUpdate($hash);

    PRESENCE_ProcessState($hash, $a[2]) unless($hash->{helper}{DISABLED});

    if($a[2] eq "present")
    {
        readingsBulkUpdate($hash, "device_name", $a[3]) if($hash->{MODE} =~ /^(lan-bluetooth|local-bluetooth)$/ and defined($a[3]));

        readingsBulkUpdate($hash, "speed", $a[4]) if($hash->{MODE} eq "fritzbox" and defined($a[4]));
    }
    elsif($a[2] eq "absent")
    {
        readingsBulkUpdate($hash, "speed", $a[4])  if($hash->{MODE} eq "fritzbox" and defined($a[4]));
    }
    elsif($a[2] eq "error")
    {
        $a[3] =~ s/<<line-break>>/\n/g;

        Log3 $hash->{NAME}, 2, "PRESENCE ($name) - error while processing check: ".$a[3];
    }

    readingsEndUpdate($hash, 1);

    #Schedule the next check within $timeout if it is a regular run
    if($local eq "0")
    {
        my $seconds = (($a[2] eq "present") ? $hash->{INTERVAL_PRESENT} : $hash->{INTERVAL_NORMAL});

        $seconds = $hash->{INTERVAL_OVERRIDED} if($hash->{INTERVAL_OVERRIDED});

        Log3 $hash->{NAME}, 4, "PRESENCE ($name) - rescheduling next check in $seconds seconds";

        RemoveInternalTimer($hash);
        InternalTimer(gettimeofday()+$seconds, "PRESENCE_StartLocalScan", $hash) unless($hash->{helper}{DISABLED});
    }
}

#####################################
sub PRESENCE_ProcessAbortedScan($)
{
    my ($hash, $msg) = @_;
    my $name = $hash->{NAME};
    delete($hash->{helper}{RUNNING_PID});
    RemoveInternalTimer($hash);

    my $retry_interval = AttrVal($name,"retryInterval",10);

    if(defined($hash->{helper}{RETRY_COUNT}))
    {
        if($hash->{helper}{RETRY_COUNT} >= AttrVal($name, "retryCount", 3))
        {
            Log3 $hash->{NAME}, 2, "PRESENCE ($name) - device could not be checked after ".$hash->{helper}{RETRY_COUNT}." ".($hash->{helper}{RETRY_COUNT} > 1 ? "retries" : "retry"). " (resuming normal operation): $msg" if($hash->{helper}{RETRY_COUNT} == 3);
            InternalTimer(gettimeofday()+$hash->{INTERVAL_NORMAL}, "PRESENCE_StartLocalScan", $hash, 0) unless($hash->{helper}{DISABLED});
            $hash->{helper}{RETRY_COUNT}++;
        }
        else
        {
            Log3 $hash->{NAME}, 2, "PRESENCE ($name) - device could not be checked after ".$hash->{helper}{RETRY_COUNT}." ".($hash->{helper}{RETRY_COUNT} > 1 ? "retries" : "retry")." (retrying in $retry_interval seconds): $msg";
            InternalTimer(gettimeofday()+$retry_interval, "PRESENCE_StartLocalScan", $hash, 0) unless($hash->{helper}{DISABLED});
            $hash->{helper}{RETRY_COUNT}++;
        }
    }
    else
    {
        $hash->{helper}{RETRY_COUNT} = 1;
        InternalTimer(gettimeofday()+$retry_interval, "PRESENCE_StartLocalScan", $hash, 0) unless($hash->{helper}{DISABLED});
        Log3 $hash->{NAME}, 2, "PRESENCE ($name) - device could not be checked (retrying in $retry_interval seconds): $msg"
    }

    readingsSingleUpdate($hash, "state", "timeout",1);
}

##########################################################################################################################
#
#  Helper Functions
#
##########################################################################################################################


#####################################
sub PRESENCE_DoInit($)
{
    my ($hash) = @_;

    if(not exists($hash->{helper}{DISABLED}) or (exists($hash->{helper}{DISABLED}) and $hash->{helper}{DISABLED} == 0))
    {
        readingsSingleUpdate($hash, "state", "active",0);
        $hash->{helper}{CURRENT_TIMEOUT} = "normal";
        DevIo_SimpleWrite($hash, $hash->{ADDRESS}."|".$hash->{INTERVAL_NORMAL}."\n", 2);
    }
    else
    {
        readingsSingleUpdate($hash, "state", "disabled",0);
    }

    return undef;
}

#####################################
sub PRESENCE_calculateThreshold($)
{
    my ($value) = @_;

    if(defined($value) and $value ne "")
    {
        if($value =~ /^(\d?\d):(\d\d)$/)
        {
            $value = $1 * 60 + $2;
        }
        elsif($value =~ /^(\d?\d):(\d\d):(\d\d)$/)
        {
            $value = $1 * 3600 + $2 * 60 + $3;
        }
        elsif($value !~ /^\d?\d+$/)
        {
            $value = 0;
        }
    }
    else
    {
        $value = 0;
    }

    return $value;
}

#####################################
sub PRESENCE_ThresholdTrigger($)
{
    my ($hash) = @_;

    if($hash->{helper}{DISABLED})
    {
        delete($hash->{helper}{NEW_STATE});
        return undef;
    }

    if($hash->{helper}{NEW_STATE})
    {
        readingsBeginUpdate($hash);
        readingsBulkUpdateIfChanged($hash, "state", $hash->{helper}{NEW_STATE});
        readingsBulkUpdateIfChanged($hash, "presence", $hash->{helper}{NEW_STATE});
        readingsEndUpdate($hash, 1);

        $hash->{helper}{CURRENT_STATE} =  $hash->{helper}{NEW_STATE};

        delete($hash->{helper}{NEW_STATE});
    }
}

#####################################
sub PRESENCE_ProcessState($$)
{
    my ($hash, $state) = @_;
    my $name = $hash->{NAME};

    my $current_state = $hash->{helper}{CURRENT_STATE} ? $hash->{helper}{CURRENT_STATE} : "";
    my $new_state = $hash->{helper}{NEW_STATE} ? $hash->{helper}{NEW_STATE} : "";

    my $absenceThreshold = AttrVal($name, "absenceThreshold", 1);
    my $presenceThreshold = AttrVal($name, "presenceThreshold", 1);

    my $absenceTimeout = PRESENCE_calculateThreshold(AttrVal($name, "absenceTimeout", ""));
    my $presenceTimeout = PRESENCE_calculateThreshold(AttrVal($name, "presenceTimeout", ""));

    if($state eq "absent")
    {
        RemoveInternalTimer($hash, "PRESENCE_ThresholdTrigger");

        my $count = ($hash->{helper}{ABSENT_COUNT} ? $hash->{helper}{ABSENT_COUNT} : 0);

        if($hash->{MODE} eq "event")
        {
            if($absenceTimeout > 0 and $current_state ne "absent" and $new_state ne "absent")
            {
                readingsBulkUpdate($hash, "state", "maybe absent");
                readingsBulkUpdate($hash, "presence", "maybe absent");
                $hash->{helper}{NEW_STATE} = "absent";
                InternalTimer(gettimeofday()+$absenceTimeout, "PRESENCE_ThresholdTrigger", $hash);
            }
            else
            {
                readingsBulkUpdate($hash, "state", "absent");
                readingsBulkUpdate($hash, "presence", "absent");

                $hash->{helper}{CURRENT_STATE} = "absent";
                delete($hash->{helper}{NEW_STATE});
            }
        }
        else
        {
            if(++$count >= $absenceThreshold)
            {
                readingsBulkUpdate($hash, ".presenceThresholdCounter", 0);
                readingsBulkUpdate($hash, ".absenceThresholdCounter", ($count-1));
                readingsBulkUpdate($hash, "state", "absent");
                readingsBulkUpdate($hash, "presence", "absent");
            }
            else
            {
                $hash->{helper}{ABSENT_COUNT} = $count;

                readingsBulkUpdate($hash, ".presenceThresholdCounter", 0);
                readingsBulkUpdate($hash, ".absenceThresholdCounter", $count);
                readingsBulkUpdate($hash, "state", "maybe absent");
                readingsBulkUpdate($hash, "presence", "maybe absent");

                Log3 $name, 4, "PRESENCE ($name) - device is absent after $count check".($count == 1 ? "" : "s").". ".($absenceThreshold-$count)." check".(($absenceThreshold-$count) == 1 ? "" : "s")." left before going absent";
            }
        }

        delete($hash->{helper}{PRESENT_COUNT});
    }
    elsif($state eq "present")
    {
        RemoveInternalTimer($hash, "PRESENCE_ThresholdTrigger");
        my $count = ($hash->{helper}{PRESENT_COUNT} ? $hash->{helper}{PRESENT_COUNT} : 0);

        if($hash->{MODE} eq "event")
        {
            if($presenceTimeout > 0 and  $current_state ne "present" and $new_state ne "present")
            {
                readingsBulkUpdate($hash, "state", "maybe present");
                readingsBulkUpdate($hash, "presence", "maybe present");
                $hash->{helper}{NEW_STATE} = "present";
                InternalTimer(gettimeofday()+$presenceTimeout, "PRESENCE_ThresholdTrigger", $hash);
            }
            else
            {
                readingsBulkUpdate($hash, "state", "present");
                readingsBulkUpdate($hash, "presence", "present");

                $hash->{helper}{CURRENT_STATE} = "present";
                delete($hash->{helper}{NEW_STATE});
            }
        }
        else
        {
            if(++$count >= $presenceThreshold)
            {
                readingsBulkUpdate($hash, ".absenceThresholdCounter", 0);
                readingsBulkUpdate($hash, ".presenceThresholdCounter", ($count-1));
                readingsBulkUpdate($hash, "state", "present");
                readingsBulkUpdate($hash, "presence", "present");

                $hash->{helper}{CURRENT_STATE} = "present";
            }
            else
            {
                $hash->{helper}{PRESENT_COUNT} = $count;

                readingsBulkUpdate($hash, ".absenceThresholdCounter", 0);
                readingsBulkUpdate($hash, ".presenceThresholdCounter", $count);
                readingsBulkUpdate($hash, "state", "maybe present");
                readingsBulkUpdate($hash, "presence", "maybe present");

                Log3 $name, 4, "PRESENCE ($name) - device is present after $count check".($count == 1 ? "" : "s").". ".($presenceThreshold-$count)." check".(($presenceThreshold-$count) == 1 ? "" : "s")." left before going present";
            }
        }

        delete($hash->{helper}{ABSENT_COUNT});
    }
    else
    {
        readingsBulkUpdate($hash, "state", $state);
    }
}

#####################################
sub PRESENCE_ProcessAddonData($$)
{
    my ($hash, $data) = @_;

    my ($a, $h) = parseParams($data, ";");

    foreach my $key (sort keys %{$h})
    {
         readingsBulkUpdate($hash, $key, $h->{$key}) if(defined($h->{$key}));
    }

    return undef;
}

#####################################
sub PRESENCE_setNotfiyDev($)
{
    my ($hash) = @_;

    notifyRegexpChanged($hash,"(global|".$hash->{EVENT_PRESENT}."|".$hash->{EVENT_ABSENT}.")");
}

1;

=pod
=item helper
=item summary    provides presence detection checks
=item summary_DE stellt eine Anwesenheitserkennung zur Verf&uuml;gung
=begin html

<a name="PRESENCE"></a>
<h3>PRESENCE</h3>
<ul>
  The PRESENCE module provides several possibilities to check the presence of mobile phones or similar mobile devices such as tablets.
  <br><br>
  This module provides several operational modes to serve your needs. These are:<br><br>
  <ul>
  <li><b>lan-ping</b> - A presence check of a device via network ping in your LAN/WLAN.</li>
  <li><b>fritzbox</b> - A presence check by requesting the device state from the FritzBox internals (only available when running FHEM on a FritzBox!).</li>
  <li><b>local-bluetooth</b> - A presence check by searching directly for a given bluetooth device nearby.</li>
  <li><b>function</b> - A presence check by using your own perl function which returns a presence state.</li>
  <li><b>shellscript</b> - A presence check by using an self-written script or binary which returns a presence state.</li>
  <li><b>event</b> - A presence check by listening to FHEM events of other definitions.</li>
  <li><b>lan-bluetooth</b> - A presence check of a bluetooth device via LAN network by connecting to a presenced or collectord instance.</li>
  </ul>
  <br>
  Each mode can be optionally configured with a specific check interval and a present check interval.<br><br>
  <ul>
  <li>check-interval - The interval in seconds between each presence check. Default value: 30 seconds</li>
  <li>present-check-interval - The interval in seconds between each presence check in case the device is <i>present</i>. Otherwise the normal check-interval will be used.</li>
  </ul>
  <br><br>
  <a name="PRESENCE_define"></a>
  <b>Define</b><br><br>
  <ul><b>Mode: lan-ping</b><br><br>
    <code>define &lt;name&gt; PRESENCE lan-ping &lt;ip-address&gt; [ &lt;check-interval&gt; [ &lt;present-check-interval&gt; ] ]</code><br>
    <br>
    Checks for a network device via PING requests and reports its presence state.<br><br>
    <u>Example</u><br><br>
    <code>define iPhone PRESENCE lan-ping 192.168.179.21</code><br>
    <br>
    <b>Mode: fritzbox</b><br><br>
    <code>define &lt;name&gt; PRESENCE fritzbox &lt;device-name/mac-address&gt; [ &lt;check-interval&gt; [ &lt;present-check-interval&gt; ] ]</code><br>
    <br>
    Checks for a network device by requesting the internal state on a FritzBox via ctlmgr_ctl. The device-name must be the same as shown in the network overview of the FritzBox or can be substituted by the MAC address with the format XX:XX:XX:XX:XX:XX<br><br>
    <i>This check is only applicable when FHEM is running on a FritzBox! The detection of absence can take about 10-15 minutes!</i><br><br>
    <u>Example</u><br><br>
    <code>define iPhone PRESENCE fritzbox iPhone-6</code><br>
    <code>define iPhone PRESENCE fritzbox 00:06:08:05:0D:00</code><br><br>
    <b>Mode: local-bluetooth</b><br><br>
    <code>define &lt;name&gt; PRESENCE local-bluetooth &lt;bluetooth-address&gt; [ &lt;check-interval&gt; [ &lt;present-check-interval&gt; ] ]</code><br>
    <br>
    Checks for a bluetooth device and reports its presence state. For this mode the shell command "hcitool" is required (provided with a <a href="http://www.bluez.org" target="_new">bluez</a> installation under Debian via APT), as well
    as a functional bluetooth device directly attached to your machine.<br><br>
    <u>Example</u><br><br>
    <code>define iPhone PRESENCE local-bluetooth 0a:8d:4f:51:3c:8f</code><br><br>
    <b>Mode: function</b><br><br>
    <code>define &lt;name&gt; PRESENCE function {...} [ &lt;check-interval&gt; [ &lt;present-check-interval&gt; ] ]</code><br>
    <br>
    Checks for a presence state via perl-code. You can use a self-written perl function to obtain the presence state of a specific device (e.g. via SNMP check).<br><br>
    The function must return 0 (absent) or 1 (present). An example can be found in the <a href="http://www.fhemwiki.de/wiki/Anwesenheitserkennung" target="_new">FHEM-Wiki</a>.<br><br>
    <u>Example</u><br><br>
    <code>define iPhone PRESENCE function {snmpCheck("10.0.1.1","0x44d77429f35c")}</code><br><br>
    <b>Mode: shellscript</b><br><br>
    <code>define &lt;name&gt; PRESENCE shellscript "&lt;path&gt; [&lt;arg1&gt;] [&lt;argN&gt;]..." [ &lt;check-interval&gt; [ &lt;present-check-interval&gt; ] ]</code><br>
    <br>
    Checks for a presence state via shell script. You can use a self-written script or binary in any language to obtain the presence state of a specific device (e.g. via SNMP check).<br><br>
    The shell must return 0 (absent) or 1 (present) on <u>console (STDOUT)</u>. Any other values will be treated as an error<br><br>
    <u>Example</u><br><br>
    <code>define iPhone PRESENCE shellscript "/opt/check_device.sh iPhone"</code><br><br>
    <b>Mode: event</b><br><br>
    <code>define &lt;name&gt; PRESENCE event &lt;absent-regexp&gt; &lt;present-regexp&gt;</code><br>
    <br>
    Listens for events of other FHEM definitions to determine a presence state. You must provide two event regexp's in the same style as for the <a href="#notify">notify</a> module.<br><br>
    If an event matches one of the provides regexps, the presence state will be changed.<br><br>
    <u>Example</u><br><br>
    <code>define Presence_John PRESENCE event Door_Switch:off Door_Switch:on</code><br><br>
    <b>Mode: lan-bluetooth</b><br><br>
    Checks for a bluetooth device with the help of presenced or collectord. They can be installed where-ever you like, just must be accessible via network.
    The given device will be checked for presence status.<br>
    <br>
    <code>define &lt;name&gt; PRESENCE lan-bluetooth &lt;bluetooth-address&gt; &lt;ip-address&gt;[:port]  [ &lt;check-interval&gt; ]</code><br>
    <br>
    The default port is 5111 (presenced). Alternatly you can use port 5222 (collectord)<br>
    <br>
    <u>Example</u><br><br>
    <code>define iPhone PRESENCE lan-bluetooth 0a:4f:36:d8:f9:89 127.0.0.1:5222</code><br><br>
    <u>presenced</u><br><br>
    <ul>The presence is a perl network daemon, which provides presence checks of multiple bluetooth devices over network.
    It listens on TCP port 5111 for incoming connections from a FHEM PRESENCE instance or a running collectord.<br>
<PRE>
Usage:
  presenced [-d] [-p &lt;port&gt;] [-P &lt;filename&gt;]
  presenced [-h | --help]


Options:
  -p, --port
     TCP Port which should be used (Default: 5111)
  -P, --pid-file
     PID file for storing the local process id (Default: /var/run/presenced.pid)
  -d, --daemon
     detach from terminal and run as background daemon
  -n, --no-timestamps
     do not output timestamps in log messages
  -v, --verbose
     Print detailed log output
  -h, --help
     Print detailed help screen
</PRE>

    It uses the hcitool command (provided by a <a href="http://www.bluez.org" target="_new">bluez</a> installation)
    to make a paging request to the given bluetooth address (like 01:B4:5E:AD:F6:D3). The devices must not be visible, but
    still activated to receive bluetooth requests.<br><br>

    If a device is present, this is send to FHEM, as well as the device name as reading.<br><br>

    The presenced is available as:<br><br>
    <ul>
    <li>direct perl script file: <a href="https://svn.fhem.de/trac/export/HEAD/trunk/fhem/contrib/PRESENCE/presenced" target="_new">presenced</a></li>
    <li>.deb package for Debian/Raspbian (noarch): <a href="https://svn.fhem.de/trac/export/HEAD/trunk/fhem/contrib/PRESENCE/deb/presenced-1.5.deb" target="_new">presenced-1.5.deb</a></li>
    </ul>
    </ul><br><br>
        <u>lepresenced</u><br><br>
    <ul>lepresenced is a Perl network daemon that provides presence checks of
    multiple bluetooth devices over network. In contrast to presenced,
    lepresenced covers <u>Bluetooth 4.0 (low energy) devices, i. e.
    Gigaset G-Tags, FitBit Charges.</u>
    lepresenced listens on TCP port 5333 for connections of a PRESENCE definition
    or collectord.<br>
<PRE>
Usage:
    lepresenced --bluetoothdevice &lt;bluetooth device&gt; --listenaddress &lt;listen address&gt; --listenport &lt;listen port&gt; --loglevel &lt;log level&gt; --daemon
    lepresenced -b &lt;bluetooth device&gt; -a &lt;listen address&gt; -p &lt;listen port> -l &lt;log level&gt; -d

valid log levels:
    LOG_CRIT, LOG_ERR, LOG_WARNING, LOG_NOTICE, LOG_INFO, LOG_DEBUG. Default: LOG_INFO

Examples:
    lepresenced --bluetoothdevice hci0 --listenaddress 127.0.0.1 --listenport 5333 --daemon
    lepresenced --loglevel LOG_DEBUG --daemon
</PRE>

    To detect the presence of a device, it uses the command <i>hcitool lescan</i> (package:
    <a href="http://www.bluez.org" target="_new">bluez</a>) to continuously listen to
    beacons of Bluetooth LE devices.
    <br><br>

    If a device is present, this is send to FHEM, as well as the device name as reading.<br><br>

    The presenced is available as:<br><br>
    <ul>
    <li>Perl script: <a href="https://svn.fhem.de/trac/export/HEAD/trunk/fhem/contrib/PRESENCE/lepresenced" target="_new">lepresenced</a></li>
    <li>.deb package (noarch): <a href="https://svn.fhem.de/trac/export/HEAD/trunk/fhem/contrib/PRESENCE/deb/" target="_new">contrib/PRESENCE/deb/</a></li>
    </ul>
    </ul><br><br>
    <u>collectord</u><br><br>
    <ul>
    The collectord is a perl network daemon, which handles connections to several presenced installations to search for multiple bluetooth devices over network.<br><br>

    It listens on TCP port 5222 for incoming connections from a FHEM presence instance.
<PRE>
Usage:
  collectord -c &lt;configfile&gt; [-d] [-p &lt;port&gt;] [-P &lt;pidfile&gt;]
  collectord [-h | --help]


Options:
  -c, --configfile &lt;configfile&gt;
     The config file which contains the room and timeout definitions
  -p, --port
     TCP Port which should be used (Default: 5222)
  -P, --pid-file
     PID file for storing the local process id (Default: /var/run/collectord.pid)
  -d, --daemon
     detach from terminal and run as background daemon
  -n, --no-timestamps
     do not output timestamps in log messages
  -v, --verbose
     Print detailed log output
  -l, --logfile &lt;logfile&gt;
     log to the given logfile
  -h, --help
     Print detailed help screen
</PRE>
    Before the collectord can be used, it needs a config file, where all different rooms, which have a presenced detector, will be listed. This config file looks like:
    <br><br>
<PRE>
    # room definition
    # ===============
    #
    [room-name]              # name of the room
    address=192.168.0.10     # ip-address or hostname
    port=5111                # tcp port which should be used (5111 is default)
    presence_timeout=120     # timeout in seconds for each check when devices are present
    absence_timeout=20       # timeout in seconds for each check when devices are absent

    [living room]
    address=192.168.0.11
    port=5111
    presence_timeout=180
    absence_timeout=20
</PRE>

    If a device is present in any of the configured rooms, this is send to FHEM, as well as the device name as reading and the room which has detected the device.<br><br>

    The collectord is available as:<br><br>

    <ul>
    <li>direct perl script file: <a href="https://svn.fhem.de/trac/export/HEAD/trunk/fhem/contrib/PRESENCE/collectord" target="_new">collectord</a></li>
    <li>.deb package for Debian (noarch): <a href="https://svn.fhem.de/trac/export/HEAD/trunk/fhem/contrib/PRESENCE/deb/collectord-1.8.1.deb" target="_new">collectord-1.8.1.deb</a></li>
    </ul>
    </ul><br><br>

  </ul>
  <br>
  <a name="PRESENCE_set"></a>
  <b>Set</b>
  <ul>
  <li><b>statusRequest</b> - Schedules an immediatly check.</li>
  <li><b>power</b> - Executes the given power command which is set as attribute to power (on or off) the device (only when attribute "powerCmd" is set)</li>
  <li><b>overrideInterval</b> - Override the check interval to the given number of seconds. (not applicable in mode "event" and "lan-bluetooth")</li>
  <li><b>clearOverride</b> - clear an active check interval override (only if set command overrideInterval was executed before)</li>
  </ul>
  <br>

  <a name="PRESENCE_get"></a>
  <b>Get</b>
  <ul>
  N/A
  </ul>
  <br>

  <a name="PRESENCE_attr"></a>
  <b>Attributes</b><br><br>
  <ul>
    <li><a href="#do_not_notify">do_not_notify</a></li>
    <li><a href="#readingFnAttributes">readingFnAttributes</a></li><br>
    <li><a name="PRESENCE_disable">disable</a></li>
    If this attribute is activated, an active check will be disabled.<br><br>
    Possible values: 0 => not disabled , 1 => disabled<br>
    Default Value is 0 (not disabled)<br><br>
    <li><a name="PRESENCE_absenceThreshold">absenceThreshold</a></li><br> <i>(not applicable in mode "event" )</i><br>
    The number of checks that have to result in "absent" before the state of the PRESENCE definition is changed to "absent".
    This can be used to verify the absence of a device with multiple check runs before the state is finally changed to "absent".
    If this attribute is set to a value &gt;1, the reading state and presence will be set to "maybe absent" during the absence verification.<br><br>
    Default Value is 1 (no absence verification)<br><br>
    <li><a name="PRESENCE_presenceThreshold">presenceThreshold</a></li><br> <i>(not applicable in mode "event" )</i><br>
    The number of checks that have to result in "present" before the state of the PRESENCE definition is changed to "present".
    This can be used to verify the permanent presence of a device with multiple check runs before the state is finally changed to "present".
    If this attribute is set to a value &gt;1, the reading state and presence will be set to "maybe present" during the presence verification.<br><br>
    Default Value is 1 (no presence verification)<br><br>
    <li><a name="PRESENCE_absenceTimeout">absenceTimeout</a></li><br> <i>(only in mode "event" applicable)</i><br>
    The timeout after receiving an "absent" event, before the state of the PRESENCE definition is switched to "absent".
    This can be used to verify the permanent absence by waiting a specific time frame to not receive an "present" event.
    If this timeout is reached with no "present" event received in the meantime, the presence state will finally be set to "absent".
    The timeout is given in HH:MM:SS format, where hours and minutes are optional.
    If this attribute is set to a valid value, the reading state and presence will be set to "maybe absent" during the absence verification.<br><br>
    Default Value is 0 (no absence verification)<br><br>
    <li><a name="PRESENCE_presenceTimeout">presenceTimeout</a></li><br> <i>(only in mode "event" applicable)</i><br>
    The timeout after receiving an "present" event, before the state of the PRESENCE definition is switched to "present".
    This can be used to verify the permanent presence by waiting a specific time frame to not receive an "absent" event.
    If this timeout is reached with no "absent" event received in the meantime, the presence state will finally be set to "present".
    The timeout is given in HH:MM:SS format, where hours and minutes are optional.
    If this attribute is set to a valid value, the reading state and presence will be set to "maybe present" during the presence verification.<br><br>
    Default Value is 0 (no presence verification)<br><br>
    <li><a name="PRESENCE_retryInterval">retryInterval</a></li><br> <i>(Not applicable in mode "event" or "lan-bluetooth")</i><br>
    The check interval in case a check is prematurely aborted and was unable to check the presence. In this case, PRESENCE reschedules
    the next check as retry within the given retry interval in seconds (usually lower than the regular check interval).
    <br><br>
    Default Value is 10 seconds<br><br>
    <li><a name="PRESENCE_retryCount">retryCount</a></li><br> <i>(Not applicable in mode "event" or "lan-bluetooth")</i><br>
    The maximum number of checks to perform within the retryInterval in case a check is prematurely aborted and was unable to check the presence.
    PRESENCE will try to retry after a failed check to a maximum of the given number of tries. If all retries fails also, it will uses afterwards
    the regular check interval.
    <br><br>
    Default Value is 3 (number of check retries)<br><br>
    <li><a name="PRESENCE_pingCount">pingCount</a></li> (Only in mode "ping" applicable)<br>
    Changes the count of the used ping packets to recognize a present state. Depending on your network performance sometimes a packet can be lost or blocked.<br><br>
    Default Value is 4 (packets)<br><br>
    <li><a name="PRESENCE_bluetoothHciDevice">bluetoothHciDevice</a></li> (Only in Mode "local-bluetooth" applicable)<br>
    Set a specific bluetooth HCI device to use for scanning. If you have multiple bluetooth modules connected, you can select a specific one to use for scanning (e.g. hci0, hci1, ...).<br><br>
    <li><a name="PRESENCE_fritzboxCheckSpeed">fritzboxCheckSpeed</a></li> (Only in Mode "fritzbox" applicable)<br>
    When this attribute is enabled, the network speed is checked in addition to the device state.<br>
    This only makes sense for wireless devices connected directly to the FritzBox.
    <br><br>
    Possible values: 0 => do not check speed, 1 => check speed when device is active<br>
    Default value is 0 (no speed check)
    <br><br>
    <li><a name="PRESENCE_powerCmd">powerCmd</a></li><br>
    Define a FHEM command, which powers on or off the device.<br><br>

    When executing the powerCmd (set command: power) following placeholders will be replaced by there corresponding values:<br><br>
    <ul>
    <li><code>$NAME</code> - name of the PRESENCE definition</li>
    <li><code>$ADDRESS</code> - the address of the PRESENCE definition as given in the define statement</li>
    <li><code>$ARGUMENT</code> - the argument given to the power set command (e.g. "on" or "off)</li>
    </ul>
    <br>
    Example FHEM commands:<br><br>
    <ul>
        <li><code>set PowerSwitch_1 on</code></li>
        <li><code>set PowerSwitch_1 $ARGUMENT</code></li>
        <li><code>"/opt/power_on.sh $ADDRESS"</code></li>
        <li><code>{powerOn("$ADDRESS", "username", "password")}</code></li>
    </ul>
  </ul>
  <br>

  <a name="PRESENCE_events"></a>
  <b>Generated readings/events:</b><br><br>
  <ul>
    <u>General readings/events:</u><br><br>
    <ul>
    <li><b>state</b>: (absent|maybe absent|present|maybe present|disabled|error|timeout) - The state of the device, check errors or "disabled" when the <a href="#PRESENCE_disable">disable</a> attribute is enabled</li>
    <li><b>presence</b>: (absent|maybe absent|present|maybe present) - The presence state of the device. The value "maybe absent" only occurs if <a href="#PRESENCE_absenceThreshold">absenceThreshold</a> is activated. The value "maybe present" only occurs if <a href="#PRESENCE_presenceThreshold">presenceThreshold</a> is activated.</li>
    <li><b>powerCmd</b>: (executed|failed) - power command was executed or has failed</li>
    </ul><br><br>
    <u>Bluetooth specific readings/events:</u><br><br>
    <ul>
    <li><b>device_name</b>: $name - The name of the Bluetooth device in case it's present</li>
    </ul><br><br>
    <u>FRITZ!Box specific readings/events:</u><br><br>
    <ul>
    <li><b>speed</b>: $speed - The current speed of the checked device if attribute <a href="#PRESENCE_fritzboxCheckSpeed">fritzboxCheckSpeed</a> is activated</li>
    </ul><br><br>
    <u>presenced/collectord specific readings/events:</u><br><br>
    <ul>
    <li><b>command_accepted</b>: $command_accepted (yes|no) - Was the last command acknowleged and accepted by the presenced or collectord?</li>
    <li><b>room</b>: $room - If the module is connected with a collector daemon this event shows the room, where the device is located (as defined in the collectord config file)</li>
    </ul>
  </ul>
</ul>


=end html

=begin html_DE

<a name="PRESENCE"></a>
<h3>PRESENCE</h3>
<ul>
  Das PRESENCE Module bietet mehrere M&ouml;glichkteiten um die Anwesenheit von Handys/Smartphones oder anderen mobilen Ger&auml;ten (z.B. Tablets) zu erkennen.
  <br><br>
  Dieses Modul bietet dazu mehrere Modis an um Anwesenheit zu erkennen. Diese sind:<br><br>
  <ul>
  <li><b>lan-ping</b> - Eine Erkennung auf Basis von Ping-Tests im lokalen LAN/WLAN</li>
  <li><b>fritzbox</b> - Eine Erkennung aufgrund der internen Abfrage des Status auf der FritzBox (nur m&ouml;glich, wenn FHEM auf einer FritzBox l&auml;uft)</li>
  <li><b>local-bluetooth</b> - Eine Erkennung auf Basis von Bluetooth-Abfragen durch den FHEM Server. Das Ger&auml;t muss dabei in Empfangsreichweite sein, aber nicht sichtbar sein</li>
  <li><b>function</b> - Eine Erkennung mithilfe einer selbst geschriebenen Perl-Funktion, welche den Anwesenheitsstatus ermittelt.</li>
  <li><b>shellscript</b> - Eine Erkennung mithilfe eines selbst geschriebenen Skriptes oder Programm (egal in welcher Sprache).</li>
  <li><b>event</b> - Eine Erkennung basierend auf Events einer anderen Definition in FHEM. </li>
  <li><b>lan-bluetooth</b> - Eine Erkennung durch Bluetooth-Abfragen via Netzwerk (LAN/WLAN) in ein oder mehreren R&auml;umen</li>
  </ul>
  <br>
  Jeder Modus kann optional mit spezifischen Pr&uuml;f-Intervallen ausgef&uuml;hrt werden.<br><br>
  <ul>
  <li>check-interval - Das normale Pr&uuml;finterval in Sekunden f&uuml;r eine Anwesenheitspr&uuml;fung. Standardwert: 30 Sekunden</li>
  <li>present-check-interval - Das Pr&uuml;finterval in Sekunden, wenn ein Ger&auml;t anwesend (<i>present</i>) ist. Falls nicht angegeben, wird der Wert aus check-interval verwendet</li>
  </ul>
  <br><br>
  <a name="PRESENCE_define"></a>
  <b>Define</b><br><br>
  <ul><b>Modus: lan-ping</b><br><br>
    <code>define &lt;name&gt; PRESENCE lan-ping &lt;IP-Addresse oder Hostname&gt; [ &lt;Interval&gt; [ &lt;Anwesend-Interval&gt; ] ]</code><br>
    <br>
    Pr&uuml;ft ob ein Ger&auml;t &uuml;ber Netzwerk (&uuml;blicherweise WLAN) auf Ping-Anfragen reagiert und setzt entsprechend den Anwesenheitsstatus.<br><br>
    <u>Beispiel</u><br><br>
    <code>define iPhone PRESENCE lan-ping 192.168.179.21</code><br><br>
    <b>Modus: fritzbox</b><br><br>
    <code>define &lt;name&gt; PRESENCE fritzbox &lt;Ger&auml;tename/MAC-Adresse&gt; [ &lt;Interval&gt; [ &lt;Anwesend-Interval&gt; ] ]</code><br>
    <br>
    Pr&uuml;ft ob ein Ger&auml;t welches per WLAN mit der FritzBox verbunden ist, erreichbar durch Abfrage des Status mit dem Befehl ctlmgr_ctl.
    Der Ger&auml;tename (Parameter: &lt;Ger&auml;tename&gt;) muss dem Namen entsprechen, welcher im Men&uuml;punkt "Heimnetz" auf der FritzBox-Oberfl&auml;che angezeigt wird oder kann durch die MAC-Adresse im Format XX:XX:XX:XX:XX:XX ersetzt werden.<br><br>
    <i>Dieser Modus ist nur verwendbar, wenn FHEM auf einer FritzBox l&auml;uft! Die Erkennung einer Abwesenheit kann ca. 10-15 Minuten dauern!</i><br><br>
    <u>Beispiel</u><br><br>
    <code>define iPhone PRESENCE fritzbox iPhone-6</code><br>
    <code>define iPhone PRESENCE fritzbox 00:06:08:05:0D:00</code><br><br>
    <b>Modus: local-bluetooth</b><br><br>
    <code>define &lt;name&gt; PRESENCE local-bluetooth &lt;Bluetooth-Adresse&gt; [ &lt;Interval&gt; [ &lt;Anwesend-Interval&gt; ] ]</code><br>
    <br>
    Pr&uuml;ft ob ein Bluetooth-Ger&auml;t abgefragt werden kann und meldet dies als Anwesenheit. F&uuml;r diesen Modus wird der Shell-Befehl "hcitool" ben&ouml;tigt
    (wird durch das Paket <a href="http://www.bluez.org" target="_new">bluez</a> bereitgestellt), sowie ein funktionierender Bluetooth-Empf&auml;nger (intern oder als USB-Stick)<br><br>
    <u>Beispiel</u><br><br>
    <code>define iPhone PRESENCE local-bluetooth 0a:4f:36:d8:f9:8</code><br><br>
    <b>Modus: function</b><br><br>
    <code>define &lt;name&gt; PRESENCE function {...} [ &lt;Interval&gt; [ &lt;Anwesend-Interval&gt; ] ]</code><br>
    <br>
    Pr&uuml;ft den Anwesenheitsstatus mithilfe einer selbst geschriebenen Perl-Funktion (z.B. SNMP Abfrage).<br><br>
    Diese Funktion muss 0 (Abwesend) oder 1 (Anwesend) zur&uuml;ckgeben. Ein entsprechendes Beispiel findet man im <a href="http://www.fhemwiki.de/wiki/Anwesenheitserkennung" target="_new">FHEM-Wiki</a>.<br><br>
    <u>Beispiel</u><br><br>
    <code>define iPhone PRESENCE function {snmpCheck("10.0.1.1","0x44d77429f35c")</code><br><br>
    <b>Mode: shellscript</b><br><br>
    <code>define &lt;name&gt; PRESENCE shellscript "&lt;Skript-Pfad&gt; [&lt;arg1&gt;] [&lt;argN&gt;]..." [ &lt;Interval&gt; [ &lt;Anwesend-Interval&gt; ] ]</code><br>
    <br>
    Pr&uuml;ft den Anwesenheitsstatus mithilfe eines selbst geschrieben Skripts oder Programmes (egal in welcher Programmier-/Skriptsprache)<br><br>
    Der Aufruf dieses Skriptes muss eine 0 (Abwesend) oder 1 (Anwesend) auf der <u>Kommandozeile (STDOUT)</u> ausgeben. Alle anderen Werte/Ausgaben werden als Fehler behandelt.<br><br>
    <u>Beispiel</u><br><br>
    <code>define iPhone PRESENCE shellscript "/opt/check_device.sh iPhone"</code><br><br>
    <b>Mode: event</b><br><br>
    <code>define &lt;name&gt; PRESENCE event &lt;Abwesend-Regexp&gt; &lt;Anwesend-Regexp&gt;</code><br>
    <br>
    Lauscht auf Events von anderen Definitionen innerhalb von FHEM um die Anwesenheit darzustellen.
    Die regul&auml;ren Ausdr&uuml;cke f&uuml;r An- und Abwesenheit entsprechen dabei der Syntax von <a href="#notify">notify</a>.<br><br>
    Sobald innerhalb von FHEM ein Event gefeuert wird, welches auf die Abwesend-Regexp bzw. Anwesend-Regexp passt, wird der Status entsprechend in PRESENCE gesetzt.<br><br>
    <u>Beispiel</u><br><br>
    <code>define Anwesenheit PRESENCE event Tuerschalter:off Tuerschalter:on</code><br><br>
    <b>Modus: lan-bluetooth</b><br><br>
    Pr&uuml;ft ein Bluetooth-Ger&auml;t auf Anwesenheit &uuml;ber Netzwerk mit Hilfe von presenced oder collectord. Diese k&ouml;nnen auf jeder Maschine installiert werden,
    welche eine Standard-Perl-Umgebung bereitstellt und &uuml;ber Netzwerk erreichbar ist.
    <br>
    <br>
    <code>define &lt;name&gt; PRESENCE lan-bluetooth &lt;Bluetooth-Adresse&gt; &lt;IP-Adresse&gt;[:Port] [ &lt;Interval&gt; ]</code><br>
    <br>
    Der Standardport ist 5111 (presenced). Alternativ kann man den Port 5222 (collectord) nutzen. Generell ist der Port aber frei w&auml;hlbar.<br><br>
    <u>Beispiel</u><br><br>
    <code>define iPhone PRESENCE lan-bluetooth 0a:4f:36:d8:f9:89 127.0.0.1:5222</code><br><br>
    <u>presenced</u><br><br>
    <ul>Der presenced ist ein Perl Netzwerkdienst, welcher eine Bluetooth-Anwesenheitserkennung von ein oder mehreren Ger&auml;ten &uuml;ber Netzwerk bereitstellt.
    Dieser lauscht standardm&auml;&szlig;ig auf TCP Port 5111 nach eingehenden Verbindungen von dem PRESENCE Modul oder einem collectord.<br>
<PRE>
Usage:
  presenced -d [-p &lt;port&gt;] [-P &lt;filename&gt;]
  presenced [-h | --help]


Options:
  -p, --port
     TCP Port which should be used (Default: 5111)
  -P, --pid-file
     PID file for storing the local process id (Default: /var/run/presenced.pid)
  -d, --daemon
     detach from terminal and run as background daemon
  -v, --verbose
     Print detailed log output
  -h, --help
     Print detailed help screen
</PRE>

    Zur Bluetooth-Abfrage wird der Shell-Befehl "hcitool" verwendet (Paket: <a href="http://www.bluez.org" target="_new">bluez</a>)
    um sogenannte "Paging-Request" an die gew&uuml;nschte Bluetooth Adresse (z.B. 01:B4:5E:AD:F6:D3) durchzuf&uuml;hren. Das Ger&auml;t muss dabei nicht sichtbar sein, allerdings st&auml;ndig aktiviert sein
    um Bluetooth-Anfragen zu beantworten.
    <br><br>

    Wenn ein Ger&auml;t anwesend ist, wird dies an FHEM &uuml;bermittelt zusammen mit dem Ger&auml;tenamen als Reading.<br><br>

    Der presenced ist zum Download verf&uuml;gbar als:<br><br>
    <ul>
    <li>Perl Skript: <a href="https://svn.fhem.de/trac/export/HEAD/trunk/fhem/contrib/PRESENCE/presenced" target="_new">presenced</a></li>
    <li>.deb Paket f&uuml;r Debian/Raspbian (architekturunabh&auml;ngig): <a href="https://svn.fhem.de/trac/export/HEAD/trunk/fhem/contrib/PRESENCE/deb/presenced-1.5.deb" target="_new">presenced-1.5.deb</a></li>
    </ul>
    </ul><br><br>
    <u>lepresenced</u><br><br>
    <ul>lepresenced ist ein Perl Netzwerkdienst, der analog zu presenced eine
    Bluetooth-Anwesenheitserkennung von ein oder mehreren Ger&auml;ten
    &uuml;ber Netzwerk bereitstellt. Im Gegensatz zu presenced unterst&uuml;tzt
    lepresenced <u>Bluetooth 4.0 (Low Energy) Ger&auml;te wie z. B. Gigaset G-Tags,
    FitBit Charges.</u>
    lepresenced lauscht standardm&auml;&szlig;ig auf TCP Port 5333 und wartet
    auf eingehende Verbindungen des PRESENCE-Moduls bzw. von collectord.<br>
<PRE>
Usage:
    lepresenced --bluetoothdevice &lt;bluetooth device&gt; --listenaddress &lt;listen address&gt; --listenport &lt;listen port&gt; --loglevel &lt;log level&gt; --daemon
    lepresenced -b &lt;bluetooth device&gt; -a &lt;listen address&gt; -p &lt;listen port> -l &lt;log level> -d

valid log levels:
    LOG_CRIT, LOG_ERR, LOG_WARNING, LOG_NOTICE, LOG_INFO, LOG_DEBUG. Default: LOG_INFO

Examples:
    lepresenced --bluetoothdevice hci0 --listenaddress 127.0.0.1 --listenport 5333 --daemon
    lepresenced --loglevel LOG_DEBUG --daemon
</PRE>

    Zur Bluetooth-Abfrage wird der Befehl <i>hcitool lescan</i> (Paket:
    <a href="http://www.bluez.org" target="_new">bluez</a>) verwendet, der
    fortw&auml;hrend auf die Beacons der Bluetooth-LE-Ger&auml;te lauscht.
    <br><br>

    Wenn ein Ger&auml;t anwesend ist, wird dies an FHEM &uuml;bermittelt zusammen mit dem Ger&auml;tenamen als Reading.<br><br>

    Der le presenced ist zum Download verf&uuml;gbar als:<br><br>
    <ul>
    <li>Perl Skript: <a href="https://svn.fhem.de/trac/export/HEAD/trunk/fhem/contrib/PRESENCE/lepresenced" target="_new">lepresenced</a></li>
    <li>.deb Paket (architekturunabh&auml;ngig) unter <a href="https://svn.fhem.de/trac/export/HEAD/trunk/fhem/contrib/PRESENCE/deb/" target="_new">contrib/PRESENCE/deb/</a></li>
    </ul>
    </ul><br><br>
    <u>collectord</u><br><br>
    <ul>
    Der collectord ist ein Perl Netzwerk Dienst, welcher Verbindungen zu mehreren presenced-Instanzen verwaltet um eine koordinierte Suche nach ein oder mehreren Bluetooth-Ger&auml;ten &uuml;ber Netzwerk durchzuf&uuml;hren.<br><br>

    Er lauscht auf TCP port 5222 nach eingehenden Verbindungen von einem PRESENCE Modul.
<PRE>
Usage:
  collectord -c &lt;configfile&gt; [-d] [-p &lt;port&gt;] [-P &lt;pidfile&gt;]
  collectord [-h | --help]


Options:
  -c, --configfile &lt;configfile&gt;
     The config file which contains the room and timeout definitions
  -p, --port
     TCP Port which should be used (Default: 5222)
  -P, --pid-file
     PID file for storing the local process id (Default: /var/run/collectord.pid)
  -d, --daemon
     detach from terminal and run as background daemon
  -v, --verbose
     Print detailed log output
  -l, --logfile &lt;logfile&gt;
     log to the given logfile
  -h, --help
     Print detailed help screen
</PRE>
    Bevor der collectord verwendet werden kann, ben&ouml;tigt er eine Konfigurationsdatei in welcher alle R&auml;ume mit einem presenced-Agenten eingetragen sind. Diese Datei sieht wie folgt aus:
    <br><br>
<PRE>
    # Raum Definitionen
    # =================
    #
    [Raum-Name]              # Name des Raumes
    address=192.168.0.10     # IP-Adresse oder Hostname
    port=5111                # TCP Port welcher benutzt werden soll (standardm&auml;&szlig;ig 5111)
    presence_timeout=120     # Pr&uuml;finterval in Sekunden f&uuml;r jede Abfrage eines Ger&auml;tes, welches anwesend ist
    absence_timeout=20       # Pr&uuml;finterval in Sekunden f&uuml;r jede Abfrage eines Ger&auml;tes, welches abwesend ist

    [Wohnzimmer]
    address=192.168.0.11
    port=5111
    presence_timeout=180
    absence_timeout=20
</PRE>
<br>
    Wenn ein Ger&auml;t in irgend einem Raum anwesend ist, wird dies an FHEM &uuml;bermittelt, zusammen mit dem Ger&auml;tenamen und dem Raum, in welchem das Ger&auml;t erkannt wurde.<br><br>

    Der collectord ist zum Download verf&uuml;gbar als:<br><br>

    <ul>
    <li>Perl Skript:  <a href="https://svn.fhem.de/trac/export/HEAD/trunk/fhem/contrib/PRESENCE/collectord" target="_new">collectord</a></li>
    <li>.deb Paket f&uuml;r Debian (architekturunabh&auml;ngig):  <a href="https://svn.fhem.de/trac/export/HEAD/trunk/fhem/contrib/PRESENCE/deb/collectord-1.8.1.deb" target="_new">collectord-1.8.1.deb</a></li>
    </ul>
    </ul>
  </ul>
  <br>

  <a name="PRESENCE_set"></a>
  <b>Set</b>
  <ul>
  <li><b>statusRequest</b> - Startet einen sofortigen Check.</li>
  <li><b>power</b> - Startet den powerCmd-Befehl welche durch den Parameter powerCmd angegeben ist (Nur wenn das Attribut "powerCmd" definiert ist)</li>
  <li><b>overrideInterval</b> - Übersteuert das Prüfinterval auf die übergebene Dauer in Sekunden (Nicht im Modus "event" und "lan-bluetooth" anwendbar)</li>
  <li><b>clearOverride</b> - Entfernt eine zuvor gesetzte Übersteuerung des Prüfintervals (Nur anwendbar, wenn zuvor eine Übersteuerung mit dem Set-Befehl overrideInterval stattgefunden hat)</li>
  </ul>
  <br>

  <a name="PRESENCE_get"></a>
  <b>Get</b>
  <ul>
  N/A
  </ul>
  <br>

  <a name="PRESENCE_attr"></a>
  <b>Attributes</b><br><br>
  <ul>
    <li><a href="#do_not_notify">do_not_notify</a></li>
    <li><a href="#readingFnAttributes">readingFnAttributes</a></li><br>
    <li><a name="PRESENCE_disable">disable</a></li>
    Wenn dieses Attribut aktiviert ist, wird die Anwesenheitserkennung nicht mehr durchgef&uuml;hrt.<br><br>
    M&ouml;gliche Werte: 0 => Erkennung durchf&uuml;hren , 1 => Keine Erkennungen durchf&uuml;hren<br>
    Standardwert ist 0 (Erkennung durchf&uuml;hren)<br><br>
    <li><a name="PRESENCE_absenceThreshold">absenceThreshold</a></li> <i>(Nicht im Modus "event" anwendbar)</i><br>
    Die Anzahl an Checks, welche in "absent" resultieren m&uuml;ssen, bevor der Status der PRESENCE-Definition auf "absent" wechselt.
    Mit dieser Funktion kann man die Abwesenheit eines Ger&auml;tes verifizieren bevor der Status final auf "absent" ge&auml;ndert wird.
    Wenn dieses Attribut auf einen Wert &gt;1 gesetzt ist, werden die Readings "state" und "presence" auf den Wert "maybe absent" gesetzt,
    bis der Status final auf "absent" wechselt.<br><br>
    Standardwert ist 1 (keine Abwesenheitsverifizierung)<br><br>
    <li><a name="PRESENCE_presenceThreshold">presenceThreshold</a></li> <i>(Nicht im Modus "event" anwendbar)</i><br>
    Die Anzahl an Checks, welche in "present" resultieren m&uuml;ssen, bevor der Status der PRESENCE-Definition auf "present" wechselt.
    Mit dieser Funktion kann man die Anwesenheit eines Ger&auml;tes verifizieren bevor der Status final auf "present" ge&auml;ndert wird.
    Wenn dieses Attribut auf einen Wert &gt;1 gesetzt ist, werden die Readings "state" und "presence" auf den Wert "maybe present" gesetzt,
    bis der Status final auf "present" wechselt.<br><br>
    Standardwert ist 1 (keine Anwesenheitsverifizierung)<br><br>
    <li><a name="PRESENCE_absenceTimeout">absenceTimeout</a></li> <i>(Nur im Modus "event" anwendbar)</i><br>
    Die Dauer, die nach einem "absent"-Event gewartet werden soll, bis der Status der PRESENCE-Definition tats&auml;chlich auf "absent" ge&auml;ndert werden soll.
    Die Dauer kann dabei im Format HH:MM:SS angegeben werden, wobei Stunden und Minuten optional sind.
    Wenn dieses Attribut auf einen g&uuml;ltigen Wert gesetzt ist, werden die Readings "state" und "presence" bei einem "absent"-Event zun&auml;chst auf den Wert "maybe absent" gesetzt.
    Sobald das parametrisierte Zeitfenster um ist, wird der Status final auf "absent" gesetzt.<br><br>
    Standardwert ist 0 Sekunden (keine Statusverz&ouml;gerung)<br><br>
    <li><a name="PRESENCE_presenceTimeout">presenceTimeout</a></li> <i>(Nur im Modus "event" anwendbar)</i><br>
    Die Dauer, die nach einem "present"-Event gewartet werden soll, bis der Status der PRESENCE-Definition tats&auml;chlich auf "present" ge&auml;ndert werden soll.
    Die Dauer kann dabei im Format HH:MM:SS angegeben werden, wobei Stunden und Minuten optional sind.
    Wenn dieses Attribut auf einen g&uuml;ltigen Wert gesetzt ist, werden die Readings "state" und "presence" bei einem "present"-Event zun&auml;chst auf den Wert "maybe present" gesetzt.
    Sobald das parametrisierte Zeitfenster um ist, wird der Status final auf "present" gesetzt.<br><br>
    Standardwert ist 0 Sekunden (keine Statusverz&ouml;gerung)<br><br>
    <li><a name="PRESENCE_retryInterval">retryInterval</a></li> <i>(Nicht im Modus "event" oder "lan-bluetooth" anwendbar)</i><br>
    Das Prüfinterval, welches im Falle eines vorzeitig abgebrochenen Checks genutzt wird, um eine Wiederholung auszuführen. Dazu wird im Falle eines abgebrochenen
    Checks der nächste Check nach der übergebenen Dauer in Sekunden ausgeführt. Diese sollte geringer sein als das reguläre Prüfinterval.
    <br><br>
    Standardwert ist 10 Sekunden<br><br>
    <li><a name="PRESENCE_retryCount">retryCount</a></li> <i>(Nicht im Modus "event" oder "lan-bluetooth" anwendbar)</i><br>
    Die maximale Anzahl an Wiederholungen, sollte ein Check vorzeitig abgebrochen werden. Sobald ein Check vorzeitigabbricht, werden maximal die übergebene Anzahl an Wiederholung
    innerhalb des in retryInterval konfigurierten Interval ausgeführt um in kürzerer Zeit ein valides Ergebnis zu erhalten.
    <br><br>
    Standardwert ist 3 Wiederholungen<br><br>
    <li><a name="PRESENCE_pingCount">pingCount</a></li> (Nur im Modus "ping" anwendbar)<br>
    Ver&auml;ndert die Anzahl der Ping-Pakete die gesendet werden sollen um die Anwesenheit zu erkennen.
    Je nach Netzwerkstabilit&auml;t k&ouml;nnen erste Pakete verloren gehen oder blockiert werden.<br><br>
    Standardwert ist 4 (Versuche)<br><br>
    <li><a name="PRESENCE_bluetoothHciDevice">bluetoothHciDevice</a></li> (Nur im Modus "local-bluetooth" anwendbar)<br>
    Sofern man mehrere Bluetooth-Empf&auml;nger verf&uuml;gbar hat, kann man mit diesem Attribut ein bestimmten Empf&auml;nger ausw&auml;hlen, welcher zur Erkennung verwendet werden soll (bspw. hci0, hci1, ...). Es muss dabei ein vorhandener HCI-Ger&auml;tename angegeben werden wie z.B. <code>hci0</code>.
    <br><br>
    <li><a name="PRESENCE_fritzboxCheckSpeed">fritzboxCheckSpeed</a></li> (Nur im Modus "fritzbox")<br>
    Zus&auml;tzlich zum Status des Ger&auml;ts wird die aktuelle Verbindungsgeschwindigkeit ausgegeben<br>
    Das macht nur bei WLAN Ger&auml;ten Sinn, die direkt mit der FritzBox verbunden sind. Bei abwesenden Ger&auml;ten wird als Geschwindigkeit 0 ausgegeben.
    <br><br>
    M&ouml;gliche Werte: 0 => Geschwindigkeit nicht pr&uuml;fen, 1 => Geschwindigkeit pr&uuml;fen<br>
    Standardwert ist 0 (Keine Geschwindigkeitspr&uuml;fung)
    <br><br>
    <li><a name="PRESENCE_powerCmd">powerCmd</a></li><br>
    Ein FHEM-Befehl, welcher das Ger&auml;t schalten kann.<br><br>

    Wenn der power-Befehl ausgef&uuml;hrt wird (set-Befehl: power) werden folgende Platzhalter durch ihre entsprechenden Werte ersetzt:<br><br>
    <ul>
    <li><code>$NAME</code> - Name der PRESENCE-Definition</li>
    <li><code>$ADDRESS</code> - Die &uuml;berwachte Addresse der PRESENCE Definition, wie sie im define-Befehl angegeben wurde.</li>
    <li><code>$ARGUMENT</code> - Das Argument, was dem Set-Befehl "power" &uuml;bergeben wurde. (z.B. "on" oder "off")</li>
    </ul>
    <br>
    Beispielhafte FHEM-Befehle:<br><br>
    <ul>
        <li><code>set PowerSwitch_1 on</code></li>
        <li><code>set PowerSwitch_1 $ARGUMENT</code></li>
        <li><code>"/opt/power_on.sh $ADDRESS"</code></li>
        <li><code>{powerOn("$ADDRESS", "username", "password")}</code></li>
    </ul>
    </ul>
  <br>

  <a name="PRESENCE_events"></a>
  <b>Generierte Readings/Events:</b><br><br>
  <ul>
    <u>Generelle ReadingsEvents:</u><br><br>
    <ul>
    <li><b>state</b>: (absent|maybe absent|present|maybe present|disabled|error|timeout) - Der Anwesenheitsstatus eine Ger&auml;tes (absent = abwesend; present = anwesend) oder "disabled" wenn das <a href="#PRESENCE_disable">disable</a>-Attribut aktiviert ist</li>
    <li><b>presence</b>: (absent|maybe absent|present|maybe present) - Der Anwesenheitsstatus eine Ger&auml;tes (absent = abwesend; present = anwesend). Der Wert "maybe absent" (vielleicht abwesend) tritt nur auf, sofern das Attribut <a href="#PRESENCE_absenceThreshold">absenceThreshold</a> aktiviert ist. Der Wert "maybe present" (vielleicht anwesend) tritt nur auf, sofern das Attribut <a href="#PRESENCE_presenceThreshold">presenceThreshold</a> aktiviert ist.</li>
    <li><b>powerCmd</b>: (executed|failed) - Ausf&uuml;hrung des power-Befehls war erfolgreich.</li>
    </ul><br><br>
    <u>Bluetooth-spezifische Readings/Events:</u><br><br>
    <ul>
    <li><b>device_name</b>: $name - Der Name des Bluetooth-Ger&auml;tes, wenn es anwesend (Status: present) ist</li>
    </ul><br><br>
    <u>FRITZ!Box-spezifische Readings/Events:</u><br><br>
    <ul>
    <li><b>speed</b>: $speed - Die Netzwerkdeschwindigkeit des Ger&auml;tes, sofern das Attribut <a href="#PRESENCE_fritzboxCheckSpeed">fritzboxCheckSpeed</a> aktiviert ist.</li>
    </ul><br><br>
    <u>presenced-/collectord-spezifische Readings/Events:</u><br><br>
    <ul>
    <li><b>command_accepted</b>: $command_accepted (yes|no) - Wurde das letzte Kommando an den presenced/collectord akzeptiert (yes = ja, no = nein)?</li>
    <li><b>room</b>: $room - Wenn das Modul mit einem collectord verbunden ist, zeigt dieses Event den Raum an, in welchem dieses Ger&auml;t erkannt wurde (Raumname entsprechend der Konfigurationsdatei des collectord)</li>
    </ul>
  </ul>
</ul>


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