Help for NR to MQTT by variable msg

General
1

Hello,
Thanks for reading me.
I can send a message on a Mqtt topic, it works!
But NR leaves me an error and I don't like that.

Sending code:

msg.topic = "EffiCompteV2_485/Action";
msg.payload = "getModBus=010600110001:1:19200;";
console.log('MANO mqtt-->> ' + msg.topic + ' :=: ' + msg.payload);
return msg;

Error code:

MANO mqtt-->> EffiCompteV2_485/Action :=: getModBus=010600110001:1:19200;
26 Nov 15:06:08 - [error] [json:d97050094f96a565] Unexpected token 'g', "getModBus="... is not valid JSON
26 Nov 15:06:08 - [error] [json:d97050094f96a565] Unexpected number in JSON at position 1

Thanks for any help you can give me.

All code:

[
    {
        "id": "5e310c666522d99f",
        "type": "mqtt out",
        "z": "7b3ba7f3b90d2298",
        "name": "Envoie Mosquitto",
        "topic": "",
        "qos": "0",
        "retain": "",
        "respTopic": "",
        "contentType": "",
        "userProps": "",
        "correl": "",
        "expiry": "",
        "broker": "0d3d3e77a1e17f01",
        "x": 670,
        "y": 220,
        "wires": []
    },
    {
        "id": "ef5f825532812ac7",
        "type": "inject",
        "z": "7b3ba7f3b90d2298",
        "name": "",
        "props": [
            {
                "p": "payload"
            },
            {
                "p": "topic",
                "vt": "str"
            }
        ],
        "repeat": "",
        "crontab": "",
        "once": false,
        "onceDelay": 0.1,
        "topic": "",
        "payload": "",
        "payloadType": "str",
        "x": 150,
        "y": 220,
        "wires": [
            [
                "e2ebc0074c7f0543"
            ]
        ]
    },
    {
        "id": "e2ebc0074c7f0543",
        "type": "function",
        "z": "7b3ba7f3b90d2298",
        "name": "Boucle Tab_Action",
        "func": "msg.topic = \"EffiCompteV2_485/Action\";\nmsg.payload = \"getModBus=010600110001:1:19200;\";\nconsole.log('MANO mqtt-->> ' + msg.topic + ' :=: ' + msg.payload);\nreturn msg;\n\n\n\n",
        "outputs": 1,
        "timeout": "",
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 390,
        "y": 220,
        "wires": [
            [
                "5e310c666522d99f"
            ]
        ]
    },
    {
        "id": "0d3d3e77a1e17f01",
        "type": "mqtt-broker",
        "name": "Local",
        "broker": "192.168.1.60",
        "port": "1884",
        "clientid": "",
        "autoConnect": true,
        "usetls": false,
        "protocolVersion": "4",
        "keepalive": "60",
        "cleansession": true,
        "autoUnsubscribe": true,
        "birthTopic": "",
        "birthQos": "0",
        "birthPayload": "",
        "birthMsg": {},
        "closeTopic": "",
        "closeQos": "0",
        "closePayload": "",
        "closeMsg": {},
        "willTopic": "",
        "willQos": "0",
        "willPayload": "",
        "willMsg": {},
        "userProps": "",
        "sessionExpiry": ""
    }
]
2

Search for that (use CTRL+F) to find which node is giving that error. If it is a JSON node then the error is because that string is not valid JSON.

3

Works for me using Mosquitto MQTT

4

I suspect that it is whatever is receiving that data that is complaining.

5

Thanks to all and especially Colin, this helped me a lot.
The problem actually came from the return of the MQTT message that I also retrieve in NR, but I didn't remember it anymore.

It's solved for me.
Have a nice day