Connectivity/AdvHeartBeat

How to confirm the Agent supports "AdvHeartBeat" protocol?

1. Check the version in deviceinfo

  Agent will support "AdvHeartBeat" in version "3.2".
          >= 3.2   : Agent supports AdvHeartBeat
          <  3.2   : Agent doesn't support AdvHeartBeat

2. Query the parameters of "AdvHeartBeat" by "Query parameters of "AdvHeartBeat"

Parameters of "AdvHeartBeat Protocol"

Sending Rate

    Unit: second
 Default: 60 
   Range: 1 ~ 0xFFFFFFFF
         -1 => Agent doesn't send "AdvHeartBeat" message

Query parameters of "AdvHeartBeat"

Type: Request
Direction: Server -> Agent
Topic: /cagent/admin/<devID>/agentcallbackreq
Payload:
{
  "susiCommData": {
       "commCmd": 127,
       "handlerName": "general",
       "sessionID": "123465"
   }
}

Type: Response
Direction: Agent -> Server 
Topic: /cagent/admin/<devID>/agentactionreq
Payload:
{
  "susiCommData": {
       "commCmd": 128,
       "handlerName": "general",
       "heartbeatrate": 60,
       "sessionID": "123465"
  }
}

Change parameters of "AdvHeartBeat"

Type: Request
Direction: Server -> Agent	
Topic: /cagent/admin/<devID>/agentcallbackreq
Payload:
{
   "susiCommData": {
   	"commCmd": 129,
       "handlerName": "general",
       "heartbeatrate": 20,
       "sessionID": "123465"
   }
}   

Type: Response
Direction: Agent -> Server		
Topic: /cagent/admin/<devID>/agentactionreq		
Payload:
{
   "susiCommData": {
       "commCmd": 130,
       "handlerName": "general",
       "result":"SUCCESS",  //or "FALSE"
       "sessionID": "123465"
    }
}

AdvHeartBeat Protocol

AdvHeartBeat Topic & Payload

Topic: /cagent/admin/<devID>/notify
QoS: 0
Retained: 0
Payload: ~ 35 character
{"hb":{"devID":"0017000E40000001"}}

Client Site

Agent needs send "AdvHeartBeat" message ( refer to AdvHeartBeat Topic & Payload ) by period as below picture.

Server Site

1. Server updates latest update time after receiving a AdvHeartBeat message with its AdvHeartBeat Table( NoSQL ).
2. Server need to check update time from AdvHeartBeat Table only.
3. If the latest update time is over timeout ( Note: This value is depend on Server. Recommend: 3 x send rate => 3 x 60 = 180 sec => tolerate drop 2 AdvHeartBeat MSG ).
   1. If it is timeout & status is connected => then change status to disconnect & send a re-connect message to this device
4. If server check there is latest AdvHeartBeat message in table but there are not device information in device list table ( SQL ).
   1. Server sends a re-connect message to this device.