diff --git a/README b/README
deleted file mode 100755
index aa37134..0000000
--- a/README
+++ /dev/null
@@ -1,202 +0,0 @@
-#!/usr/bin/perl
-#
-# hoover.pl - Wi-Fi probe requests sniffer
-#
-# Original idea by David Nelissen (twitter.com/davidnelissen)
-# Thank to him for allowing me to reuse the idea!
-#
-# This script scans for wireless probe requests and prints them out.
-# Hereby you can see for which SSID's devices nearby are searching.
-#
-# Copyright (c) 2012 David Nelissen & Xavier Mertens
-# All rights reserved.
-# 
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions
-# are met:
-# 1. Redistributions of source code must retain the above copyright
-#    notice, this list of conditions and the following disclaimer.
-# 2. Redistributions in binary form must reproduce the above copyright
-#    notice, this list of conditions and the following disclaimer in the
-#    documentation and/or other materials provided with the distribution.
-# 3. Neither the name of copyright holders nor the names of its
-#    contributors may be used to endorse or promote products derived
-#    from this software without specific prior written permission.
-# 
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
-# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
-# PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL COPYRIGHT HOLDERS OR CONTRIBUTORS
-# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
-# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
-# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
-# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
-# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-# POSSIBILITY OF SUCH DAMAGE.
-#
-# History
-# -------
-# 2012/01/11	Created
-#
-
-use strict;
-use Getopt::Long;
-
-$SIG{USR1}	= \&dumpNetworks; # Catch SIGINT to dump the detected networks
-$SIG{INT}	= \&cleanKill;
-$SIG{KILL}	= \&cleanKill;
-$SIG{TERM}	= \&cleanKill;
-
-my $uniqueSSID = 0;		#uniq ssid counter
-my %detectedSSID;	# Detected network will be stored in a hash table
-			# SSID, Seen packets, Last timestamp
-my $pid;
-my $help;
-my $verbose;
-my $interface;
-my $dumpFile;
-my $ifconfigPath = "/sbin/ifconfig";
-my $iwconfigPath = "/sbin/iwconfig";
-my $tsharkPath   = "/usr/local/bin/tshark";
-my $options = GetOptions(
-	"verbose"		=> \$verbose,
-	"help"			=> \$help,
-	"interface=s"		=> \$interface,
-	"ifconfig-path=s"	=> \$ifconfigPath,
-	"iwconfig-path=s"	=> \$iwconfigPath,
-	"tsharkPath=s"		=> \$tsharkPath,
-	"dumpfile=s"		=> \$dumpFile,
-);
-
-if ($help) {
-	print <<_HELP_;
-Usage: $0 --interface=wlan0 [--help] [--verbose] [--iwconfig-path=/sbin/iwconfig] [--ipconfig-path=/sbin/ifconfig]
-		[--dumpfile=result.txt]
-Where:
---interface		: Specify the wireless interface to use
---help			: This help
---verbose		: Verbose output to STDOUT
---ifconfig-path		: Path to your ifconfig binary
---iwconfig-path		: Path to your iwconfig binary
---tshark-path		: Path to your tshark binary
---dumpfile		: Save found SSID's/MAC addresses in a flat file (SIGUSR1)
-_HELP_
-	exit 0;
-}
-
-# We must be run by root
-(getlogin() ne "root") && die "$0 must be run by root!\n";
-
-# We must have an interface to listen to
-(!$interface) && die "No wireless interface speficied!\n";
-
-# Check ifconfig availability
-( ! -x $ifconfigPath) && die "ifconfig tool not found!\n";
-
-# Check iwconfig availability
-( ! -x $iwconfigPath) && die "iwconfig tool not found!\n";
-
-# Check tshark availability
-( ! -x $tsharkPath) && die "tshark tool not available!\n";
-
-# Configure wireless interface
-(system("$ifconfigPath $interface up")) && "Cannot initialize interface $interface!\n";
-
-# Set interface in monitor mode
-(system("$iwconfigPath $interface mode monitor")) && die "Cannot set interface $interface in monitoring mode!\n";
-
-# Create the child process to change wireless channels
-(!defined($pid = fork)) && die "Cannot fork child process!\n";
-
-if ($pid) {
-	# ---------------------------------
-	# Parent process: run the main loop
-	# ---------------------------------
-	($verbose) && print "!! Running with PID: $$ (child: $pid)\n";
-	open(TSHARK, "$tsharkPath -i $interface -n -l subtype probereq |") || die "Cannot spawn tshark process!\n";
-	while (<TSHARK>) {
-		chomp;
-		my $line = $_;
-		chomp($line = $_); 
-		# Everything exept backslash (some probes contains the ssid in ascii, not usable)
-		#if($line = m/\d+\.\d+ ([a-zA-Z0-9:]+).+SSID=([a-zA-ZÀ-ÿ0-9"\s\!\@\$\%\^\&\*\(\)\_\-\+\=\[\]\{\}\,\.\?\>\<]+)/) { 
-		if($line = m/\d+\.\d+ ([a-zA-Z0-9:_]+).+SSID=([a-zA-ZÀ-ÿ0-9"\s\!\@\$\%\^\&\*\(\)\_\-\+\=\[\]\{\}\,\.\?\>\<]+)/) { 
-			if($2 ne "Broadcast") {	# Ignore broadcasts
-				my $macAddress = $1;
-				my $newKey = $2;
-				print DEBUG "$macAddress : $newKey\n";
-				if (! $detectedSSID{$newKey})
-				{
-					# New network found!
-					my @newSSID = ( $newKey,		# SSID
-							1,			# First packet
-							$macAddress,		# MAC Address
-							time());		# Seen now
-					$detectedSSID{$newKey} = [ @newSSID ];
-					$uniqueSSID++;
-					print "++ New probe request from $macAddress with SSID: $newKey [$uniqueSSID]\n";
-				}
-				else
-				{
-					# Existing SSID found!
-					$detectedSSID{$newKey}[1]++;			# Increase packets counter
-					$detectedSSID{$newKey}[2] = $macAddress;	# MAC Address
-					$detectedSSID{$newKey}[3] = time();		# Now
-					($verbose) && print "-- Probe seen before: $newKey [$uniqueSSID]\n";
-				}
-			}
-		}	
-	}
-}
-else {
-	# --------------------------------------------------
-	# Child process: Switch channels at regular interval
-	# --------------------------------------------------
-	($verbose) && print STDOUT "!! Switching wireless channel every 5\".\n";
-	while (1) {
-		for (my $channel = 1; $channel <= 12; $channel++) {
-			(system("$iwconfigPath $interface channel $channel")) &&
-				die "Cannot set interface channel.\n";
-			sleep(5);
-		}
-	}
-	
-}
-
-sub dumpNetworks {
-	my $i;
-	my $key;
-	print STDOUT "!! Dumping detected networks:\n";
-	print STDOUT "!! MAC Address          SSID                           Count      Last Seen\n";
-	print STDOUT "!! -------------------- ------------------------------ ---------- -------------------\n";
-	if ($dumpFile) {
-		open(DUMP, ">$dumpFile") || die "Cannot write to $dumpFile (Error: $?)";
-		print DUMP "MAC Address          SSID                           Count      Last Seen\n";
-		print DUMP "-------------------- ------------------------------ ---------- -------------------\n";
-	}
-	for $key ( keys %detectedSSID)
-	{
-		my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = localtime($detectedSSID{$key}[2]);
-		my $lastSeen = sprintf("%04d/%02d/%02d %02d:%02d:%02d", $year+1900, $mon+1, $mday, $hour, $min, $sec);
-		print STDOUT sprintf("!! %-20s %-30s %10s %-20s\n", $detectedSSID{$key}[2],
-		 				 $detectedSSID{$key}[0], $detectedSSID{$key}[1], $lastSeen);
-		($dumpFile) && print DUMP sprintf("%-20s %-30s %10s %-20s\n", 
-						 $detectedSSID{$key}[2], $detectedSSID{$key}[0],
-						 $detectedSSID{$key}[1], $lastSeen); 
-	}
-	print STDOUT "!! Total unique SSID: $uniqueSSID\n";
-	($dumpFile) && print DUMP "Total unique SSID: $uniqueSSID\n";
-	close(DUMP);
-	return;
-}
-
-sub cleanKill {
-	if ($pid) {
-		# Parent process: display information
-		print "!! Received kill signal!\n";
-		kill 1, $pid;
-		dumpNetworks;
-	}
-	exit 0;
-}
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..bf2ff80
--- /dev/null
+++ b/README.md
@@ -0,0 +1,43 @@
+# hoover.pl - Wi-Fi probe requests sniffer
+
+Original idea by David Nelissen (twitter.com/davidnelissen)
+Thank to him for allowing me to reuse the idea!
+
+This script scans for wireless probe requests and prints them out.
+Hereby you can see for which SSID's devices nearby are searching.
+
+Copyright (c) 2012 David Nelissen & Xavier Mertens
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+3. Neither the name of copyright holders nor the names of its
+   contributors may be used to endorse or promote products derived
+   from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL COPYRIGHT HOLDERS OR CONTRIBUTORS
+BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+
+## History
+
+* 2012/01/11 Created
+* 2014/03/10 Merged OSX fork and made minor fixes (timestamp)
+  * Original source from https://github.com/xme/hoover
+  * OSX support from https://github.com/hermanbanken/hoover
+* 2014/03/18 finished python version (same functionality as perl version)
+
diff --git a/hoover.pl b/hoover.pl
index aa37134..7ffa1c0 100755
--- a/hoover.pl
+++ b/hoover.pl
@@ -50,14 +50,16 @@
 
 my $uniqueSSID = 0;		#uniq ssid counter
 my %detectedSSID;	# Detected network will be stored in a hash table
-			# SSID, Seen packets, Last timestamp
+			# SSID, Seen packets, MAC, Last timestamp
 my $pid;
 my $help;
 my $verbose;
 my $interface;
 my $dumpFile;
+my $osname = $^O;
 my $ifconfigPath = "/sbin/ifconfig";
 my $iwconfigPath = "/sbin/iwconfig";
+my $airportPath  = "/System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport";
 my $tsharkPath   = "/usr/local/bin/tshark";
 my $options = GetOptions(
 	"verbose"		=> \$verbose,
@@ -65,13 +67,13 @@
 	"interface=s"		=> \$interface,
 	"ifconfig-path=s"	=> \$ifconfigPath,
 	"iwconfig-path=s"	=> \$iwconfigPath,
-	"tsharkPath=s"		=> \$tsharkPath,
+	"tshark-path=s"		=> \$tsharkPath,
 	"dumpfile=s"		=> \$dumpFile,
 );
 
 if ($help) {
 	print <<_HELP_;
-Usage: $0 --interface=wlan0 [--help] [--verbose] [--iwconfig-path=/sbin/iwconfig] [--ipconfig-path=/sbin/ifconfig]
+Usage: $0 --interface=en1_or_wlan0 [--help] [--verbose] [--iwconfig-path=/sbin/iwconfig] [--ipconfig-path=/sbin/ifconfig]
 		[--dumpfile=result.txt]
 Where:
 --interface		: Specify the wireless interface to use
@@ -86,7 +88,7 @@
 }
 
 # We must be run by root
-(getlogin() ne "root") && die "$0 must be run by root!\n";
+($< != 0) && die "$0 must be run by root!\n";
 
 # We must have an interface to listen to
 (!$interface) && die "No wireless interface speficied!\n";
@@ -95,7 +97,7 @@
 ( ! -x $ifconfigPath) && die "ifconfig tool not found!\n";
 
 # Check iwconfig availability
-( ! -x $iwconfigPath) && die "iwconfig tool not found!\n";
+($osname ne 'darwin') && ( ! -x $iwconfigPath) && die "iwconfig tool not found!\n";
 
 # Check tshark availability
 ( ! -x $tsharkPath) && die "tshark tool not available!\n";
@@ -104,7 +106,8 @@
 (system("$ifconfigPath $interface up")) && "Cannot initialize interface $interface!\n";
 
 # Set interface in monitor mode
-(system("$iwconfigPath $interface mode monitor")) && die "Cannot set interface $interface in monitoring mode!\n";
+($osname ne 'darwin') && (system("$iwconfigPath $interface mode monitor")) && die "Cannot set interface $interface in monitoring mode!\n";
+($osname eq 'darwin') && (system("$airportPath $interface -z")) && die "Cannot disassociate interface $interface!\n";
 
 # Create the child process to change wireless channels
 (!defined($pid = fork)) && die "Cannot fork child process!\n";
@@ -114,54 +117,72 @@
 	# Parent process: run the main loop
 	# ---------------------------------
 	($verbose) && print "!! Running with PID: $$ (child: $pid)\n";
-	open(TSHARK, "$tsharkPath -i $interface -n -l subtype probereq |") || die "Cannot spawn tshark process!\n";
+
+	# only valid packets and non-empty SSIDs:
+	my $displayFilter = "wlan.fcs_good==1 and not wlan_mgt.ssid==\\\"\\\"";
+	my $fieldParams = "-T fields -e wlan.sa -e wlan_mgt.ssid -Eseparator=,";
+	my $tsharkCommandLine = "$tsharkPath -i $interface -n -l $fieldParams";
+	if ($osname ne 'darwin') {
+		$tsharkCommandLine .= " subtype probereq -2 -R \"$displayFilter\" |";
+	} else {
+		$tsharkCommandLine .= " -y PPI -2 -R \"wlan.fc.type_subtype==4 and $displayFilter\" |"
+	}
+	($verbose) && print "!! command: $tsharkCommandLine\n";
+
+	open(TSHARK, $tsharkCommandLine) || die "Cannot spawn tshark process!\n";
 	while (<TSHARK>) {
 		chomp;
 		my $line = $_;
 		chomp($line = $_); 
-		# Everything exept backslash (some probes contains the ssid in ascii, not usable)
-		#if($line = m/\d+\.\d+ ([a-zA-Z0-9:]+).+SSID=([a-zA-ZÀ-ÿ0-9"\s\!\@\$\%\^\&\*\(\)\_\-\+\=\[\]\{\}\,\.\?\>\<]+)/) { 
-		if($line = m/\d+\.\d+ ([a-zA-Z0-9:_]+).+SSID=([a-zA-ZÀ-ÿ0-9"\s\!\@\$\%\^\&\*\(\)\_\-\+\=\[\]\{\}\,\.\?\>\<]+)/) { 
-			if($2 ne "Broadcast") {	# Ignore broadcasts
-				my $macAddress = $1;
-				my $newKey = $2;
-				print DEBUG "$macAddress : $newKey\n";
-				if (! $detectedSSID{$newKey})
-				{
-					# New network found!
-					my @newSSID = ( $newKey,		# SSID
-							1,			# First packet
-							$macAddress,		# MAC Address
-							time());		# Seen now
-					$detectedSSID{$newKey} = [ @newSSID ];
-					$uniqueSSID++;
-					print "++ New probe request from $macAddress with SSID: $newKey [$uniqueSSID]\n";
-				}
-				else
-				{
-					# Existing SSID found!
-					$detectedSSID{$newKey}[1]++;			# Increase packets counter
-					$detectedSSID{$newKey}[2] = $macAddress;	# MAC Address
-					$detectedSSID{$newKey}[3] = time();		# Now
-					($verbose) && print "-- Probe seen before: $newKey [$uniqueSSID]\n";
-				}
-			}
-		}	
+		my ($macAddress, $ssid) = split(/,/, $line);
+		($verbose) && print "!! found packet: mac=$macAddress, ssid=$ssid\n";
+		my $hashKey = "$macAddress-$ssid";
+		if (! $detectedSSID{$hashKey})
+		{
+			# New network found!
+			my @newSSID = ( $ssid,		# SSID
+					1,			# First packet
+					$macAddress,		# MAC Address
+					time());		# Seen now
+			$detectedSSID{$hashKey} = [ @newSSID ];
+			$uniqueSSID++;
+			print "++ New probe request from $macAddress with SSID: $ssid [$uniqueSSID]\n";
+		}
+		else
+		{
+			# Existing SSID found!
+			$detectedSSID{$hashKey}[1]++;			# Increase packets counter
+			$detectedSSID{$hashKey}[2] = $macAddress;	# MAC Address
+			$detectedSSID{$hashKey}[3] = time();		# Now
+			($verbose) && print "-- Probe seen before: $hashKey [$uniqueSSID]\n";
+		}
 	}
 }
 else {
 	# --------------------------------------------------
 	# Child process: Switch channels at regular interval
 	# --------------------------------------------------
-	($verbose) && print STDOUT "!! Switching wireless channel every 5\".\n";
-	while (1) {
-		for (my $channel = 1; $channel <= 12; $channel++) {
-			(system("$iwconfigPath $interface channel $channel")) &&
-				die "Cannot set interface channel.\n";
-			sleep(5);
-		}
-	}
-	
+	($verbose) && print STDOUT "!! Switching wireless channel every 5 seconds.\n";
+	if ($osname ne 'darwin') {
+	  while (1) {
+		  for (my $channel = 1; $channel <= 12; $channel++) {
+			  ($verbose) && print STDOUT "!! Switching to channel $channel\n";
+			  (system("$iwconfigPath $interface channel $channel")) &&
+				  die "Cannot set interface channel.\n";
+			  sleep(5);
+  		}
+	  } 
+  }
+	else {
+  	while (1) {
+	  	for (my $channel = 1; $channel <= 14; $channel++) {
+		  	($verbose) && print STDOUT "!! Switching to channel $channel\n";
+			  (system("$airportPath $interface -c$channel")) &&
+				  die "Cannot set interface channel.\n";
+		  	sleep(5);
+		  }
+	  } 
+  }
 }
 
 sub dumpNetworks {
@@ -177,7 +198,7 @@ sub dumpNetworks {
 	}
 	for $key ( keys %detectedSSID)
 	{
-		my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = localtime($detectedSSID{$key}[2]);
+		my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = localtime($detectedSSID{$key}[3]);
 		my $lastSeen = sprintf("%04d/%02d/%02d %02d:%02d:%02d", $year+1900, $mon+1, $mday, $hour, $min, $sec);
 		print STDOUT sprintf("!! %-20s %-30s %10s %-20s\n", $detectedSSID{$key}[2],
 		 				 $detectedSSID{$key}[0], $detectedSSID{$key}[1], $lastSeen);
diff --git a/hoover.py b/hoover.py
new file mode 100755
index 0000000..cf7ea44
--- /dev/null
+++ b/hoover.py
@@ -0,0 +1,159 @@
+#!/usr/bin/env python
+
+import threading
+import signal
+import sys
+import time
+import subprocess
+import os
+import os.path
+import argparse
+
+
+
+def signal_handler(signal, frame):
+    print 'You pressend CTRL+C, data is flushed into database/file...'
+    switchThread.running = False
+    switchThread.join()
+    formatString = "{0: <18} {1: <20} {2: <18}"
+    print formatString.format("mac", "ssid", "last seen")
+    for key, value in entries.iteritems():
+        print formatString.format(value.mac, value.ssid, time.strftime("%Y%m%d-%H:%M:%S", value.timeLastSeen))
+    sys.exit(0)
+
+
+class switchChannelThread (threading.Thread):
+    def __init__(self, threadID, name, delayInSeconds):
+        threading.Thread.__init__(self)
+        self.threadID = threadID
+        self.name = name
+        if osname != "Darwin":
+            self.maxChannel = 12
+        else:
+            self.maxChannel = 14
+        self.delayInSeconds = delayInSeconds
+        self.running = True
+    def run(self):
+        print 'Starting switch channel thread using a dely of %d seconds' % self.delayInSeconds
+        while self.running:
+            for channel in range (1, self.maxChannel + 1):
+                if verbose: 
+                    print 'Switching to channel %d' % (channel)
+                if osname != "Darwin":
+                    if subprocess.call([iwconfigPath, interface, "channel", str(channel)]) != 0:
+                        self.running = False
+                        sys.exit(4)
+                else:
+                    if subprocess.call([airportPath, interface, "-c%d" % channel]) != 0:
+                        self.running = False
+                        sys.exit(4)
+                    
+                time.sleep(self.delayInSeconds)
+                if not self.running:
+                    return        
+
+class Entry (object):
+    def __init__(self, mac, ssid, time):
+        self.mac = mac
+        self.ssid = ssid
+        self.timeLastSeen = time
+
+
+osname = os.uname()[0]
+if osname != "Darwin":
+    defaultInterface = "wlan0"
+else:
+    defaultInterface = "en1"
+
+# command line parsing:
+parser = argparse.ArgumentParser(description='Show and collect wlan request probes')
+parser.add_argument('--interface', default=defaultInterface, 
+    help='the interface used for monitoring')
+parser.add_argument('--tsharkPath', default='/usr/local/bin/tshark', 
+    help='path to tshark binary')
+parser.add_argument('--ifconfigPath', default='/sbin/ifconfig', 
+    help='path to ifconfig')
+parser.add_argument('--iwconfigPath', default='/sbin/iwconfig', 
+    help='path to iwconfig')
+parser.add_argument('--verbose', action='store_true', help='verbose information')
+args = parser.parse_args()
+
+tsharkPath = args.tsharkPath
+ifconfigPath = args.ifconfigPath
+iwconfigPath = args.iwconfigPath
+interface = args.interface
+verbose = args.verbose
+
+# only on osx:
+airportPath = "/System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport";
+
+# check all params
+if not os.path.isfile(tsharkPath):
+    print "tshark not found at path {0}".format(tsharkPath)
+    sys.exit(1)
+if not os.path.isfile(ifconfigPath):
+    print "ifconfig not found at path {0}".format(ifconfigPath)
+    sys.exit(1)
+if osname != "Darwin":
+    if not os.path.isfile(iwconfigPath):
+        print "iwconfig not found at path {0}".format(iwconfigPath)
+        sys.exit(1)
+
+# start interface
+if subprocess.call([ifconfigPath, interface, 'up']) != 0:
+    print "cannot start interface: {0}".format(interface)
+    sys.exit(2)
+
+# Set interface in monitor mode
+retVal = 0
+if osname != 'Darwin':
+    retVal = subprocess.call([iwconfigPath, interface, "mode", "monitor"])
+else:
+    retVal = subprocess.call([airportPath, interface, "-z"])
+
+if retVal != 0:
+    print "cannot set interface to monitor mode: {0}".format(interface)
+    sys.exit(3)
+
+# start thread that switches channels
+switchThread = switchChannelThread(1, 'SwitchChannel', 5)
+switchThread.start()
+signal.signal(signal.SIGINT, signal_handler)
+print 'press CTRL+C to exit'
+# signal.pause()
+
+# start tshark and read the results
+displayFilter = "wlan.fcs_good==1 and not wlan_mgt.ssid==\\\"\\\"";
+fieldParams = "-T fields -e wlan.sa -e wlan_mgt.ssid -Eseparator=,";
+tsharkCommandLine = "{0} -i {1} -n -l {2}"
+
+if (osname != 'Darwin'):
+    tsharkCommandLine += " subtype probereq -2 -R \"{3}\""
+else:
+	tsharkCommandLine += " -y PPI -2 -R \"wlan.fc.type_subtype==4 and {3}\""
+
+tsharkCommandLine = tsharkCommandLine.format(tsharkPath, interface, fieldParams, displayFilter)
+
+if verbose: 
+    print 'tshark command: %s\n' % tsharkCommandLine, 
+
+DEVNULL = open(os.devnull, 'w')
+popen = subprocess.Popen(tsharkCommandLine, shell=True, stdout=subprocess.PIPE, stderr=DEVNULL)
+
+# collect all Entry objects in entries
+entries = {}
+
+for line in iter(popen.stdout.readline, ''):
+    line = line.rstrip()
+#    if verbose: 
+#        print 'line: "%s"' % (line,)
+    if line.find(',') > 0:
+        mac, ssid = line.split(',', 1)
+        if line in entries:
+            if verbose:
+                print "entry found (seen before): mac: '{0}', ssid: '{1}'".format(mac,ssid)
+            entry = entries[line]
+            entry.timeLastSeen = time.localtime()
+        else:
+            print "new entry found: mac: '{0}', ssid: '{1}'".format(mac,ssid)
+            entries[line] = Entry(mac, ssid, time.localtime())