Voraussetzung: Parallel zu FHEM läuft ein Homebridge-Server. Dieser existiert bei mir, um FHEM Geräte auch über die Apple Homekit App bzw. via Siri zu steuern. Die zweite Voraussetzung ist ein MQTT-Server. Diesen benötige ich zum Schalten meiner Shellys und zum Auslesen meiner 433 Mhz Sensoren und Aktoren.

Beispiel: WiZ Lampe im Schlafzimmer mit dem namen TVLicht

Das Device wird in FHEM wie folgt angelegt:

define TVLicht MQTT_DEVICE
setuuid TVLicht 69c04ea9-f33f-034c-2c22-c6afa61bf5b672d4
attr TVLicht IODev myBroker
attr TVLicht alias TVLicht
attr TVLicht publishSet on off wiz/tvlicht/set
attr TVLicht publishSet_pct wiz/tvlicht/set
attr TVLicht room Schlafzimmer
attr TVLicht stateFormat { ReadingsVal($name,"state","?")." (".ReadingsVal($name,"pct","0")."%)" }
attr TVLicht subscribeReading_pct wiz/tvlicht/pct
attr TVLicht subscribeReading_state wiz/tvlicht/state
attr TVLicht subscribeReading_status wiz/tvlicht/status
attr TVLicht webCmd on:off:pct
attr TVLicht widgetOverride pct:slider,0,1,100

Zusätzlich gibt es noch

define TVLicht_CMD dummy
setuuid TVLicht_CMD 69c04ea9-f33f-034c-ec74-74d6b05fd715a01f
attr TVLicht_CMD room Schlafzimmer
attr TVLicht_CMD setList pct:slider,0,1,100 on off

und

define n_TVLicht_CMD notify TVLicht_CMD:pct.* set myBroker publish wiz/tvlicht/set $EVTPART1
setuuid n_TVLicht_CMD 69c05086-f33f-034c-f1eb-20862676da8ddf2d

sowie

define n_TVLicht_CMD_onoff notify TVLicht_CMD:(on|off) set myBroker publish wiz/tvlicht/set $EVENT
setuuid n_TVLicht_CMD_onoff 69c0509a-f33f-034c-7114-37424932b61b9577

Um zwischen WiZ und FHEM zu vermitteln kommt MQTT ins Spiel. Den Datenaustausch erledigt das Python-Skript wiz_tvlicht_mqtt.py, welches ich unter /opt/fhem/wiz/ abgelegt habe.

  import asyncio
  import json
  import paho.mqtt.client as mqtt
  from pywizlight import wizlight, PilotBuilder

  WIZ_IP = "192.168.1.67"
  MQTT_HOST = "192.168.1.15"
  MQTT_PORT = 1883

  TOPIC_SET = "wiz/tvlicht/set"
  TOPIC_STATE = "wiz/tvlicht/state"
  TOPIC_PCT = "wiz/tvlicht/pct"
  TOPIC_STATUS = "wiz/tvlicht/status"

  loop = None
  light = None
  mqtt_client = None

  def clamp_pct(val):
      val = int(val)
      if val < 0:
          return 0
      if val > 100:
          return 100
      return val

  def fhem_to_brightness(pct):
      pct = clamp_pct(pct)
      if pct == 0:
          return 0

      # Arbeitsversion: pywizlight reagiert bei dir auf brightness=...
      # Kleine Werte strecken, damit 1..25 nicht so hart zusammenfallen
      if pct < 26:
          pct = 26

      return pct

  def raw_to_pct(raw):
      if raw is None:
          return 0

      raw = int(raw)

      # Bei dir kommen offenbar direkt Prozentwerte zurück
      if raw <= 100:
          pct = raw
      else:
          pct = round(raw * 100 / 255)

      # kosmetisch
      if pct >= 99:
          pct = 100

      return max(0, min(100, pct))

  async def publish_state():
      global light, mqtt_client

      state = await light.updateState()
      is_on = state.get_state()
      raw = state.get_brightness()
      pct = raw_to_pct(raw)

      print(f"STATE -> on={is_on}, raw={raw}, pct={pct}")

      mqtt_client.publish(TOPIC_STATE, "on" if is_on else "off", retain=True)
      mqtt_client.publish(TOPIC_PCT, str(pct), retain=True)
      mqtt_client.publish(
          TOPIC_STATUS,
          json.dumps({
              "state": bool(is_on),
              "raw": 0 if raw is None else int(raw),
              "pct": int(pct)
          }),
          retain=True
      )

  async def set_pct(pct):
      global light

      pct = clamp_pct(pct)
      print(f"SET -> fhem_pct={pct}")

      if pct == 0:
          await light.turn_off()
          return

      brightness = fhem_to_brightness(pct)
      print(f"SET -> brightness={brightness}")

      await light.turn_on(PilotBuilder(brightness=brightness))

  async def handle_command(payload):
      payload = payload.strip()
      print(f"MQTT CMD -> {payload}")

      if payload == "on":
          await light.turn_on()

      elif payload == "off":
          await light.turn_off()

      else:
          try:
              data = json.loads(payload)

              if "brightness" in data:
                  await set_pct(data["brightness"])
              elif "pct" in data:
                  await set_pct(data["pct"])
              elif "state" in data:
                  if str(data["state"]).lower() == "on":
                      await light.turn_on()
                  elif str(data["state"]).lower() == "off":
                      await light.turn_off()
                  else:
                      return
              else:
                  return

          except Exception:
              try:
                  await set_pct(int(payload))
              except Exception as e:
                  print(f"PARSE ERROR -> {e}")
                  return

      await asyncio.sleep(1)
      await publish_state()

  async def poll_loop():
      global light
      light = wizlight(WIZ_IP)

      try:
          await publish_state()
      except Exception as e:
          print(f"Initial publish error -> {e}")

      while True:
          try:
              await publish_state()
          except Exception as e:
              print(f"Polling error -> {e}")

          await asyncio.sleep(15)

  def on_connect(client, userdata, flags, rc, properties=None):
      print("MQTT connected")
      client.subscribe(TOPIC_SET)

  def on_message(client, userdata, msg):
      payload = msg.payload.decode("utf-8")
      asyncio.run_coroutine_threadsafe(handle_command(payload), loop)

  def start_mqtt():
      global mqtt_client

      mqtt_client = mqtt.Client(mqtt.CallbackAPIVersion.VERSION2)
      mqtt_client.on_connect = on_connect
      mqtt_client.on_message = on_message
      mqtt_client.connect(MQTT_HOST, MQTT_PORT, 60)
      mqtt_client.loop_start()

  def main():
      global loop

      loop = asyncio.new_event_loop()
      asyncio.set_event_loop(loop)

      start_mqtt()

      try:
          loop.run_until_complete(poll_loop())
      finally:
          if mqtt_client is not None:
              mqtt_client.loop_stop()
              mqtt_client.disconnect()
          loop.close()

  if __name__ == "__main__":
      main()