This is only one way to do this. You can also define the bridge and thing in different lines:
bridge.things
Bridge mqtt:broker:broker “MQTT Broker: Mosquitto” [ host=“192.168.2.1”, port=1883, secure=false]
other_things.things
Thing mqtt:topic:miTemp (mqtt:broker:broker) {
Channels:
Type number : tempObyvak “Air Temperature” [ stateTopic=“sensor/teplota/obyvak”]
}
(as also posted here: MQTT Generic Thing: java.lang.Exception: No MQTT client - #5 by Ales_Macoun)