openHAB 5.1 Release discussion

Setup, Configuration and Use News & Important Changes
278

Issue with MQTT-settings after upgrading from OH5.0.3 to 5.10

All,

I have a lot of power switches running via MQTT using the internal MQTT-broker.
Until before the upgrade, the (manually created channels) all had this setting:

version: 1
things:
  mqtt:topic:Avatar-04-Tischlampe:
    bridge: mqtt:broker:RaspiMosquitto
    label: Avatar-04
    location: Schlafzimmer
    channels:
      Avatar-04-switch:
        type: switch
        label: Avatar-04-switch
        config:
          stateTopic: stat/avatar-04/RESULT
          commandTopic: cmnd/avatar-04/POWER
          transformationPattern:
            - JSONPATH:$.POWER
          qos: 1
          retained: true
          postCommand: true
          "on": "on"
          "off": "off"your code goes here

After upgrading to 5.1, all switches started repeatedly switching on/off once triggered an could only be stopped by removing the power. The next command started the behaviour again.

Aftter much trial and error, the issue could be solved by changing this setting to:

          postCommand: false

There seems to have been an undocumented breaking change in the 5.1 release?