Support wallyHOME Multi-Sensor (#3202)

lib/extension/homeassistant.js

@@ -1332,6 +1332,10 @@ const mapping = {
     'S9ZGBRC01': [cfg.sensor_action, cfg.sensor_battery],
     '511.557': [cfg.sensor_action],
     'RL804CZB': [cfg.light_brightness_colortemp_colorxy],
+    '21473-MULTI': [
+        cfg.sensor_action, cfg.binary_sensor_contact, cfg.binary_sensor_water_leak,
+        cfg.sensor_temperature, cfg.sensor_humidity, cfg.sensor_battery,
+    ],
 };
 
 Object.keys(mapping).forEach((key) => {