Add publishing and subscribing

Messaging/clientEx.py

@@ -17,5 +17,26 @@ mqttc.tls_set(ca_certs=None, certfile=None, keyfile=None, cert_reqs=ssl.CERT_REQ
 # Host is just an ip address or hostname of the broker.
 mqttc.connect(host, port=1883, keepalive=60, bind_address="")
 
+# Topic is a string of the topic to publish to.
+mqttc.publish(topic, payload=None, qos=0, retain=False)
 
+# Just subscribe to a topic.
+mqttc.subscribe(topic, qos=0)
+
+def on_message(client, userdata, message):
+    '''
+    Do something with the message. Choose based on what the topic is.
+
+    Can also just assign different callback functions for different topics 
+    using message_callback_add(sub, callback)
+    '''
+    print("Received message '" + str(message.payload) + "' on topic '"
+        + message.topic + "' with QoS " + str(message.qos))
+
+mqttc.on_message = on_message
+
+# Or for specific callback:
+# Can use foo/# for all subtopics of foo/, or
+# +/bar for all topics that include bar.
+mqttc.message_callback_add(sub, on_message)