MQTT not talking to OH2

Try to set a clientId in your mqtt.cfg and check the contents of your /var/lib/openhab2/config/org/openhab/mqtt.config for stale entries.

broker.url=tcp://192.168.1.44:1883
broker.clientId=something_new

(no need to use mqtt: in front of everyline in your /etc/openhab2/services/mqtt.cfg)

OH 2.1 or 2.2?