@MSchmidke Take a look at what Ray ( at rayshobby.net) has documented on this subject.

@TD22057 said: See here: http://forum.mysensors.org/topic/1034/mqtt-gateway-openhab-mosquitto/2 which connects mosquitto to the gateway using the bridge input. Bridging is used for connecting two brokers together (see http://mosquitto.org/man/mosquitto-conf-5.html "configuring bridges"). I think MySensor's MQTT Gateway is already a broker by itself where clients like OpenHab can connect to. However, if there is a need, you can use a bridge which forwards the messages from a remote broker(MySensor's MQTT Gateway) to a local broker(Mosquitto). Then clients could now also connect to Mosquitto.