RPC method 设备miot-spec功能定义
get_properties 可读属性，access:[read]
set_properties 可写属性，access:[write]
properties_changed 变化上报属性，access:[notify]
action 方法定义 action)
event_occured 事件定义(event)

ots: {“from”:””,”id”:3zzzz3,”method”:”set_properties”,”params”:[{“did”:”3xxxxx8″,”piid”:1,”siid”:2,”value”:true}]}