Line 30:  EthernetClient ethClient; // instantiating the class


Line 42 : client.setServer(server,1883); Connect to MQTT broker

boolean connectionResult = client.connect("pjd-mqtt",MQTT_TOPIC,1,0,"Test Connection"); 
//arg1 - client id
//arg2 - will topic
//arg3 - will qos
//arg4  - will retain
//arg 5 - will message
//api ref  http://pubsubclient.knolleary.net/api.html