Double RPC mqtt messages?

General
#1

Am I seeing double?
When I publish a RPC message via MQTT I see two messages in system log , I don’t see the same issue when I send via http (curl)
curl “http://192.168.0.103/rpc/relay” -d “{“name”:“RELAY1”, “cmd”: “SWITCH”}”
{“msg”:“ok”,“status”:“true”}

eg
mosquitto_pub -h mybroker -t esp32_8AD88C/rpc -m '{“method”:“relay”,“args”:{“name”:“TEST1”}}'

system log:

 [Sep 19 13:07:41.718] mg_rpc.c:310            relay via MQTT 
 [Sep 19 13:07:41.718] args: {"name":"TEST1"} 
 [Sep 19 13:07:41.718] mg_rpc.c:310            relay via MQTT 
 [Sep 19 13:07:41.718] args: {"name":"TEST1"}

mjs : program …

// Load Mongoose OS API
load('api_timer.js');
load('api_gpio.js');
load('api_mqtt.js');
load('api_net.js');
load('api_config.js');
load('api_rpc.js');


RPC.addHandler('relay', function(args) {

   let rc=true;
   print("args:",JSON.stringify(args));
 
  return {"status": rc  };
});


// check if MQTT connection establised and sent init
MQTT.setEventHandler(function(conn, ev, edata) 	{
	//check if connection to MQTT established
		if(ev === MQTT.EV_CONNACK)	{
		  print('MQTT Connected');
	  
		}
	}, null);
#2

also sending issue?? I don’t see any response via the “src” channel.

eg
mosquitto_pub -h mythbox -t esp32_8AD88C/rpc -m ‘{“src”:“out-topic”,“method”:“relay”,“args”:{“name”:“RELAY1”,“cmd”:“SWITCH”}}’

should I see out on mqtt channel: out-topic/rpc ??

#3

You are missing the ‘id’ key. According to my understanding, there won’t be a response if there is no command id.
The docs show the use of ‘params’ instead of ‘args’. I don’t know if this will affect operation, there is this comment in the sources: /* Note: at present we allow both args and params, but args is deprecated. */
When I wrote this article (in Spanish), everything worked fine.
Which version are you using ?

1 Like
#4

working now… documentation wasn’t quiet clear on the meaning of those extra values and it appears it hasn’t been updated in a while.
thanks

Question version?
I think its Mongoose 6.18, LwIP 2.1.3 according to the boot messages is there another way to tell?

How do I compile with latest version?

#5

Latest version of what?

The latest release version of mos is 2.19.1.
If you want to use the latest versions of Mongoose OS and libraries, switch to mos latest:

mos update latest
#6

just adding this for future referance
change the following config
"rpc.mqtt.sub_wc", false

or
mos config-set rpc.mqtt.sub_wc=false

#7

Perfect @scaprile! Example of Config.Get and Config.Set:

RPC Config:

rpc: {
...
"mqtt": {
    "enable": true,
    "pub_topic": "from/N9I0FSHV/response/rpc",
    "qos": 0,
    "sub_topic": "to/N9I0FSHV/request/rpc",
    "sub_wc": false
  },
...
}

Request CONFIG.GET on topic to/N9I0FSHV/request/rpc:

{
"id":321, 
"src":"Config.Get.Values", 
"method":"Config.Get", 
"params":{"key":"device.model", "level":9}
}

Response on topic from/N9I0FSHV/response/rpc:

{"id":321,"src":"N9I0FSHV", "dst":"Config.Get.Values", "result":"X1201"}

Request CONFIG.SET on topic to/N9I0FSHV/request/rpc:

{
"id":123, 
"src":"Config.Get.Values", 
"method":"Config.Set", 
"params":{"config":{"device":{"model": "X120"}}, "level": 9, "save":true, "try_once":false, "reboot":true}
}

Response on topic from/N9I0FSHV/response/rpc:

{"id":123, "src":"N9I0FSHV", "dst":"Config.Get.Values", "result":{"saved": true}}

Unfortunatelly the documentation is not so clear about it. Mining the code you can find out something further.