subscription{DataPointSubscription (dtId:"592c91f0-8d9b-44bf-88da-23fd1ef6d994",serialNumber:"101807A7F02809C"){ value timestamp}}

Returns the following, meaning the incoming call

{"type":"subscription_data","id":0,"payload":{"data":{"DataPointSubscription":{"serialNumber":"101807A7F02809C","channelNumber":"2","datapointId":"0","value":"{\"status\":1,\"block\":8,\"floor\":4,\"room\":4,\"image\":\"/images/20230530111935_wfx.jpg\"}","timestamp":"2023-05-30T03:19:40.524Z"}}}}

Subscribe

Returns the following, meaning the incoming call