Add initial code of simple python logger

Capture RF24Network/RF24Mesh data from the new UDP interface and log
info to MQTT broker

examples/addons/mqttLogger.py

@@ -0,0 +1,43 @@
+# Note: This code requires paho-mqtt
+# sudo pip-install paho-mqtt
+
+# Simple MQTT data logger, listens for UDP output from RF24Gateway & logs to an MQTT topic
+# For use with RF24Mesh nodes that are not able to communicate directly via TCP/IP etc
+# See RF24Gateway examples: 
+#                            RF24NetworkFrame frame = RF24NetworkFrame(header,buf,size); 
+#                            gw.sendUDP(mesh.getNodeID(header.from_node),frame);
+#
+
+# -*- coding: utf-8 -*-
+import paho.mqtt.client as mqtt
+import socket
+import sys
+
+reload(sys) 
+sys.setdefaultencoding('utf8')
+
+### Setup the MQTT host IP & topic to publish to
+mqttHost = "10.10.2.2"
+topic = 'data/RF24'
+
+### Bind to UDP port 32001 (default port of RF24Gateway UDP output)
+sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+server_address = ('localhost', 32001)
+print >>sys.stderr, 'Waiting for UDP message on %s port %s\n' % server_address
+sock.bind(server_address)
+
+while True:
+
+    data, address = sock.recvfrom(2048)
+
+    print >>sys.stderr, 'received %s bytes from %s' % (len(data), address)
+    print >>sys.stderr, data
+
+    if data:
+        ## Just log the entire chunk of data to MQTT for now
+        ## Todo: Sort, Display and Analyze the data
+        mqttc = mqtt.Client()
+        mqttc.connect(mqttHost, 1883)
+        data = unicode(data, errors='replace')
+        mqttc.publish(topic, data)
+        mqttc.loop(2)