Shelly binding - support shelly 1 plus

Hi,

openhab still gets no update, when i switch via shelly web ui.

my config:

UID: mqtt:topic:a5ee0c508b:f1b9e1d7d9
label: Shelly Plus 1
thingTypeUID: mqtt:topic
configuration: {}
bridgeUID: mqtt:broker:a5ee0c508b
channels:
  - id: SchalterShellyPlus1
    channelTypeUID: mqtt:switch
    label: SchalterShellyPlus1
    description: ""
    configuration:
      postCommand: false
      retained: true
      formatBeforePublish: '{"id":123,"src":"light","method":"Switch.Set",
        "params":{"id":0,"on":%s}}'
      qos: 2
      commandTopic: shellyplus1-441793a473a4/rpc
      stateTopic: shellyplus1-441793a473a4/status/switch:0
      transformationPattern: REGEX:(.switch:0.)∩JSONPATH:$.params.switch:0.output
      off: "false"
      on: "true"