How add device with MQTT discovery?

Configuration
1

I’m developing an ESP8266 board with 2 temperature sensors. They use mqtt over wifi to connect to HA.
At first I defined the devices in the yaml files like this:

- platform: mqtt
  name: "mqtt_dev0_temp1"
  state_topic: "cv_temp/ECFABC5ECDBB/temp"
  value_template: "{{ value_json.temp1 }}"
  qos: 1

This worked fine.

But then I wanted to improve things and add MQTT device discovery.
Like here

And I just can’t get this right.
If I send a straightforward json like this one, it is seen by HA:

{
  "name": "mqtt_ECFABC5ECD98_temp1",
  "stat_t": "cv_temp/ECFABC5ECD98/temp",
  "uniq_id": "cvtemp-ECFABC5ECD98-temp1",
  "dev_cla": "temperature",
  "unit_of_meas": "°C",
  "val_tpl": "{{ value_json.temp1 }}"
}

But I want to add the proper device too. When I try something like this, HA won’t accept it.

{
  "name": "mqtt_ECFABC5ECD98_temp1",
  "stat_t": "cv_temp/ECFABC5ECD98/temp",
  "uniq_id": "cvtemp-ECFABC5ECD98-temp1",
  "dev_cla": "temperature",
  "unit_of_meas": "°C",
  "val_tpl": "{{ value_json.temp1 }}",
  "dev": {
    "identifiers": "cvtemp-ECFABC5ECD98",
    "manufacturer": "Me",
    "model": "model",
    "name": "CV_Temp_module",
    "sw_version": "1.0"
  }
}

What am I doing wrong here?

2

try

{
  "name": "mqtt_ECFABC5ECD98_temp1",
  "stat_t": "cv_temp/ECFABC5ECD98/temp",
  "uniq_id": "cvtemp-ECFABC5ECD98-temp1",
  "dev_cla": "temperature",
  "unit_of_meas": "°C",
  "val_tpl": "{{ value_json.temp1 }}",
  "dev": {
    "identifiers": ["cvtemp-ECFABC5ECD98"],
    "manufacturer": "Me",
    "model": "model",
    "name": "CV_Temp_module",
    "sw_version": "1.0"
  }
}
3

Thanks for your suggestion. I’ve changed it a bit and the serializeJsonPretty commands now prints it as:

{
  "name": "mqtt_cvtemp_ECFABC5ECD98X_temp1",
  "stat_t": "cv_temp/ECFABC5ECD98X/stat",
  "uniq_id": "cvtemp-ECFABC5ECD98X-temp1",
  "dev_cla": "temperature",
  "unit_of_meas": "°C",
  "val_tpl": "{{ value_json.temp1 }}",
  "dev": {
    "identifiers": [
      "cvtemp-ECFABC5ECD98X"
    ],
    "manufacturer": "Me",
    "model": "model",
    "name": "CV_Temp_module",
    "sw_version": "1.0"
  }
}

That still doesn’t work however.

4

Never mind. The problem was somewhere else. pubsubclient publish was limited to 256 bytes and my message was longer.

2 Likes
5

Had the exact same problem! Off to see where to increase message sizes

6

Basically it’s making use of beginPublish and endPublish instead of just publish functions of mqtt client.

See my sketch:

8

Thanks for this. Spent why more time than I wanted to try to get this working and your code was the answer.

[edit] This was the simple solution
mqttPubSubObject.setBufferSize(1024);