//Bridge.things
Bridge mqtt:broker:mybroker "MQTT Broker: MyBroker"
[
    host="192.168.178.23",
    port=1883,
    secure="false",
    username="xxx",
    password="xxx"
]

//shelly.things

Thing mqtt:topic:mybroker:garage  "Shelly Garage"
     (mqtt:broker:mybroker)
{
    Channels:
        Type switch : power "Power"
            [
                stateTopic = "shellies/shelly1-xxxxxx/relay/0",
                commandTopic = "shellies/shelly1-xxxxxx/relay/0/command",
                on="on",
                off="off"
            ]
}