Connectivity/AdvHeartBeat

AdvHeartBeat Protocol

AdvHeartBeat Topic & Payload

Type: Response
Direction: Agent -> Server 
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.
   2. Server needs to send "Get Capability" message to client after receiving a connect info message. Agent will send its OS info and all handlers' capability to server.

Re-Connect Message

If Server aware any problem of a device's status/information. Server will send a re-connect message to Agent. Agent will send a connect info to Server after receiving a re-connect message. You can refer below for detail.

Description: Server send re-connect message to agent for asking agent re-send connect info.
Type: Request
Direction: Server -> Agent 
Topic: /cagent/admin/<devID>/agentcallbackreq
QoS: 0
Retained: 0
Payload:
{
   "susiCommData": {
      "commCmd": 125,
      "handlerName": "general",
      "response": {
          "statuscode": 4,
          "msg": "Reconnect"
      }
   }
}

Description: Agent will send connect info after receiving a re-connect message.
Type: Response
Direction: Agent -> Server
Topic: /cagent/admin/<devID>/agentinfoack
QoS: 0
Retained: 0
Payload:
{
  "susiCommData": {
    	"devID":"0017000E40000001",
    	"hostname":"AAA",
    	"sn":"0017000E40000001",
    	"mac":"0017000E40000001",
    	"version":"3.1.23",
    	"type":"SenHub",
    	"product":"WISE-1020",
    	"manufacture":"",
    	"status":"1",
    	"commCmd":1,
    	"requestID":30002,
    	"agentID":"0017000E40000001",
    	"handlerName":"general",
    	"sendTS":160081026
   }
}

Get Capability

Description: Server can get agent's capability by "Get Capability" message.
Type: Request
Direction: Server -> Agent 
Topic: /cagent/admin/<agentID>/agentcallbackreq
QoS: 0
Retained: 0
Payload:
{
   "susiCommData": {
      "requestID":1001,  
      "catalogID": 4,
      "commCmd":2051,
      "handlerName":"general"
   }
}

Description: Agent will send back OS Info to Server after receiving "Get Capability" message.
Note: This feature will be implemented in version 3.2.
Type: Response
Direction: Agent -> Server
Topic: /cagent/admin/<devID>/agentactionreq
QoS: 0
Retained: 0
Payload:
{
  "susiCommData":{
      "osInfo": {
         "cagentVersion":"3.1.23",
         "cagentType":"IoTGW",
         "osVersion":"SnailOS",
         "biosVersion":"",
         "platformName":"",
         "processorName":"SnailGW",
         "osArch":"SnailX86",
         "totalPhysMemKB":123,
         "macs":"000E40ABCDEF",
         "IP":"192.168.0.100"
      },
      "commCmd":116,
      "requestID":109,
      "agentID":"0000000E40ABCDEF",
      "handlerName":"general",
      "sendTS":1466730390
   }
}

Description: Agent will send back all handlers' capability to server.
Type: Response
Direction: Agent -> Server
Topic: /cagent/admin/<agentID>/agentactionreq
QoS: 0
Retained: 0
Payload: ( ex: HWM )
{
   "susiCommData": {
       "infoSpec": {
           "HWM": {
               "e": [
                   {"n": "v01","type": "volt","u": "V","max": 20,"min": 10},
                   {"n": "v02","type": "volt","u": "V","max": 20,"min": 10},
                   {"n": "t01","type": "temp","u": "Cel","max": 100,"min": 10},
                   {"n": "V143360","type": "current","u": "A","max": 100,"min": 10}
               ],
               "bn": "HWM"
           },
           "requestID": 2001,
           "commCmd": 2052,
           "catalogID": 4,
           "agentID": "000014DAE996BE04",
           "sendTS": 1417000000004,
           "handlerName": "general"
       }
   } 
 }

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"
    }
}

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"