I’ve created a new example topic of my currently running configuration: Using Sonoff Power Switches with Tasmota firmware and openHAB2 MQTT2 binding
@David_Graeff it seems, that my things stop working with the message “No MQTT client”, if the linked item is changed or if the channel is changed, when there is already a linked item. I fetched the following logs, after changed my mqtt.things file:
2018-12-16 12:14:11.446 [INFO ] [el.core.internal.ModelRepositoryImpl] - Refreshing model 'mqtt.things'
==> mosquitto/mosquitto.log <==
1544958851: Client paho439851773078352 disconnected.
==> openhab2/openhab.log <==
2018-12-16 12:14:11.529 [INFO ] [.transport.mqtt.MqttBrokerConnection] - Starting MQTT broker connection to 'x.x.x.x' with clientid paho481440911850144 and file store '/var/lib/openhab2/mqtt/x.x.x.x'
==> openhab2/events.log <==
2018-12-16 12:14:11.541 [hingStatusInfoChangedEvent] - 'mqtt:broker:MosquittoMqttBroker' changed from ONLINE to OFFLINE
2018-12-16 12:14:11.542 [hingStatusInfoChangedEvent] - 'mqtt:topic:SonoffPs01' changed from ONLINE to OFFLINE (BRIDGE_OFFLINE)
2018-12-16 12:14:11.542 [hingStatusInfoChangedEvent] - 'mqtt:topic:SonoffPs03' changed from ONLINE to OFFLINE (BRIDGE_OFFLINE)
2018-12-16 12:14:11.543 [hingStatusInfoChangedEvent] - 'mqtt:topic:SonoffPs04' changed from ONLINE to OFFLINE (BRIDGE_OFFLINE)
2018-12-16 12:14:11.543 [hingStatusInfoChangedEvent] - 'mqtt:topic:SonoffPs06' changed from ONLINE to OFFLINE (BRIDGE_OFFLINE)
2018-12-16 12:14:11.544 [hingStatusInfoChangedEvent] - 'mqtt:broker:MosquittoMqttBroker' changed from ONLINE to OFFLINE
2018-12-16 12:14:11.544 [me.event.ThingUpdatedEvent] - Thing 'mqtt:broker:MosquittoMqttBroker' has been updated.
2018-12-16 12:14:11.556 [hingStatusInfoChangedEvent] - 'mqtt:broker:MosquittoMqttBroker' changed from OFFLINE to ONLINE
2018-12-16 12:14:11.558 [hingStatusInfoChangedEvent] - 'mqtt:topic:SonoffPs04' changed from OFFLINE (BRIDGE_OFFLINE) to ONLINE
2018-12-16 12:14:11.559 [hingStatusInfoChangedEvent] - 'mqtt:topic:SonoffPs01' changed from OFFLINE (BRIDGE_OFFLINE) to ONLINE
2018-12-16 12:14:11.562 [hingStatusInfoChangedEvent] - 'mqtt:topic:SonoffPs06' changed from OFFLINE (BRIDGE_OFFLINE) to ONLINE
2018-12-16 12:14:11.562 [hingStatusInfoChangedEvent] - 'mqtt:topic:SonoffPs03' changed from OFFLINE (BRIDGE_OFFLINE) to ONLINE
2018-12-16 12:14:11.564 [hingStatusInfoChangedEvent] - 'mqtt:topic:SonoffPs02' changed from UNINITIALIZED to INITIALIZING
2018-12-16 12:14:11.566 [me.event.ThingUpdatedEvent] - Thing 'mqtt:broker:MosquittoMqttBroker' has been updated.
2018-12-16 12:14:11.568 [hingStatusInfoChangedEvent] - 'mqtt:topic:SonoffPs02' changed from INITIALIZING to OFFLINE (COMMUNICATION_ERROR): java.lang.Exception: No MQTT client
2018-12-16 12:14:11.575 [hingStatusInfoChangedEvent] - 'mqtt:topic:SonoffPs05' changed from UNINITIALIZED to INITIALIZING
2018-12-16 12:14:11.578 [hingStatusInfoChangedEvent] - 'mqtt:topic:SonoffPs05' changed from INITIALIZING to OFFLINE (COMMUNICATION_ERROR): java.lang.Exception: No MQTT client
2018-12-16 12:14:11.583 [hingStatusInfoChangedEvent] - 'mqtt:topic:SonoffPs07' changed from UNINITIALIZED to INITIALIZING
2018-12-16 12:14:11.585 [hingStatusInfoChangedEvent] - 'mqtt:topic:SonoffPs07' changed from INITIALIZING to OFFLINE (COMMUNICATION_ERROR): java.lang.Exception: No MQTT client
Hope that helps to figure out the issue.