Device bind/unbind

{
    "requestId": "16349988792583564403",
    "unionId": "fPLhRVC_10gI9yQwwn3swNz4XwBqqJ8m8OrrA86A",
    "topic": "bind-device"
}

Params	Type	Value	Remarks
requestId	String	4180463424101195867	Required. Random string as Id of each request for ease of tracing.
topic	String	bind-device / unbind-device	When user bind or unbind a new device, Yeelight will send this topic to third-party, and expect a SYNC request from third-party to refresh user's device list.