Heatbeat

1. Gateway heatbeat

Heatbeat is sent as multicast to (ip: 224.0.0.50, port: 9898). Gateway will send a heatbeat every 10 seconds to tell it is functioning well.

{"cmd":"heartbeat","model":"gateway","sid":"1022780","short_id":0,"token":"1234567890abcdef","data":"{\"ip\":\"172.22.4.130\"}" }

"token" is a random string generated by gateway for user to generate "key".

2. Sub-device heatbeat

Sub-device's heatbeat is sent as multicast to (ip: 224.0.0.50, port: 9898)，format as： {"cmd":"heartbeat","model":"magnet","sid":"158d000065a271","short_id":25719,"data":"{\"status\":\"open\"}"}

Sub-devices use heatbeat to report they are working well (heartbeat frequency, once per hour for sleep devices, every 10 minutes for plugin devices).

For example: in the window and HVAC auto scene, you can use heartbeat (the normal message maybe lost, but heartbeat message can be remedied)