{ "code": 400, "message": "Payload contains invalid json" }

[KoRba88]

Hi

When my ESP32 want to Publish message: Hello world, In the activity tab on my thing I only see this messege

{
"code": 400,
"message": "Payload contains invalid json"
}

[copercini]

probably your message has a problem with json formatting

[KoRba88]

Yes, I know it but why? I didn't made any changes in the provided example sketch so it should work.

Also using MQTT.fx client i see this messege and i can publish nothing.

[copercini]

Sorry for the late answer, it's sending Hello world 1 as message that isn't JSON formatted

you can fix it changing this line to snprintf (msg, 75, "{\"Hello world\":\"#%ld\"}", value);