ответ будет число 255. Это значение value.
{"supported":true,"name":"AlarmSensor","data":{"name":"devices.19.instances.0.commandClasses.156.data","type":"NoneType","value":null,"updateTime":1410993460,"invalidateTime":1410993459,"version":{"name":"version","type":"int","value":1,"updateTime":1410993461,"invalidateTime":1410993460},"security":{"name":"security","type":"bool","value":false,"updateTime":1410993460,"invalidateTime":1410993459},"interviewDone":{"name":"interviewDone","type":"bool","value":true,"updateTime":1410993463,"invalidateTime":1410993459},"interviewCounter":{"name":"interviewCounter","type":"int","value":9,"updateTime":1410993462,"invalidateTime":1410993459},"alarmMap":{"name":"alarmMap","type":"int","value":33,"updateTime":1410993463,"invalidateTime":1410993459},"alarms":{"name":"alarms","type":"NoneType","value":null,"updateTime":1410993460,"invalidateTime":1410993459},"0":{"name":"0","type":"NoneType","value":null,"updateTime":1410993464,"invalidateTime":1411860768,"srcId":{"name":"srcId","type":"int","value":19,"updateTime":1411861633,"invalidateTime":1410993463},"sensorState":{"name":"sensorState","type":"int","value":255,"updateTime":1411861633,"invalidateTime":1410993463},"sensorTime":{"name":"sensorTime","type":"int","value":0,"updateTime":1411861633,"invalidateTime":1410993463}},"5":{"name":"5","type":"NoneType","value":null,"updateTime":1410993464,"invalidateTime":1411860768,"srcId":{"name":"srcId","type":"int","value":19,"updateTime":1411860808,"invalidateTime":1410993463},"sensorState":{"name":"sensorState","type":"int","value":0,"updateTime":1411860808,"invalidateTime":1410993463},"sensorTime":{"name":"sensorTime","type":"int","value":0,"updateTime":1411860808,"invalidateTime":1410993463}}},"id":156}
Это пример датчика протечки. У него из 6 групп есть только 0-General и 5-Flood.
К примеру у датчика дыма есть три группы. Их можно видеть в топике обзора на него.