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### The `mqtt` backend
-This backend provides input from and output to an message queueing telemetry transport (MQTT)
+This backend provides input from and output to a message queueing telemetry transport (MQTT)
broker. The MQTT protocol is used in lightweight sensor/actor applications, a wide selection
of smart home implementations and as a generic message bus in many other domains.
@@ -18,7 +18,7 @@ This backend does not take any global configuration.
| `host` | `mqtt://10.23.23.1` | none | Host or URI of the MQTT broker |
| `user` | `midimonster` | none | User name for broker authentication |
| `password` | `mm` | none | Password for broker authentication |
-| `clientid` | `MM-main` | random | MQTT client identifier (generated randomly at start) |
+| `clientid` | `MM-main` | random | MQTT client identifier (generated randomly at start if unset) |
| `protocol` | `3.1.1` | `5` | MQTT protocol version (`5` or `3.1.1`) to use for the connection |
The `host` option can be specified as an URI of the form `mqtt[s]://[username][:password]@host.domain[:port]`.