ESP32 - MQTT Device Discovery

[Tantalum]

Hello

I’m trying to include a ESP32 to HA via the new MQTT Device Discovery feature. Currently the ESP32 does nothing, it only sends the mqtt message to the “homeassistant/device/3823147816S/config” topic telling that the device has a light entity.

But HA doesn’t discover it.

Can someone tell me what is wrong, incoherent or missing please?

    {
      "device": {
        "name": "My MQTT Device",
        "ids": [
          "mymqttdevice01"
        ]
      },
      "o": {
        "name": "foobar",
        "mf": "",
        "mdl": "ESP32",
        "sw": "1.24",
        "hw": "0.45",
        "cu": "http://192.168.1.226/config"
      },
      "cmps": {
        "3823147816S": {
          "p": "light",
          "name": "My MQTT Light",
          "obj_id": "mqtt_light",
          "uniq_id": "3823147816S",
          "stat_t": "stat/mydevice/switch",
          "cmd_t": "cmnd/mydevice/switch",
          "brightness": "true",
          "bri_scl": "100",
          "bri_stat_t": "stat/mydevice/brightness",
          "bri_cmd_t": "cmnd/mydevice/brightness"
        }
      }
    }

Thank you

[FloatingBoater (James Derrick)]

Hi,
Start simple, build up - and more importantly, use the search facility on this forum for worked MQTT Discovery examples to adapt:

# Send a MQTT Discovery message to create a soil moisture sensor
# Note the difference between the DEVICE name and the moisture ENTITY (allowing several sensor channels)
# Note the additional DEVICE parameters such as manufacturer, version, and the 'suggested_location' which can be used to set the Area
# Note the additional ENTITY  parameters such as an icon, the device class and unit of measurement which both allow long-term logging to give the user data graphs.
mosquitto_pub -r -h 127.0.0.1 -p 1883 -t 'homeassistant/sensor/grow-1_chan1/config' --retain -m '{"name":"Channel 1 ENTITY", "stat_t":"tele/grow-1/SENSOR", "val_tpl":"{{value_json.Channel1}}", "avty_t":"tele/grow-1/LWT", "pl_avail":"Online", "pl_not_avail":"Offline", "uniq_id":"grow-1_chan1", "dev": {"ids":["grow-1"], "name":"Grow 1 DEVICE", "mf":"Great Devices", "mdl":"Grow Sensor", "sw":"0.2", "sa":"Conservatory"}, "icon":"mdi:sprout", "dev_cla":"humidity", "unit_of_meas":"%", "expire_after":"1200", "frc_upd": true}'

MQTT discovery is instant, so you should be able to quickly prototype your code quickly.

MQTT Discovery Setup

Hi, Does the state change if you strip the code back to the basics in a test harness? e.g. Remove the units and class to test getting a raw number from the JSON via the Jinja template? Publish a test payload without totalTime to simplify the JSON? Have you double checked the payload in MQTT Explorer to avoid any confusion between total_energy and totalEnergy? I’ve posted a few examples and dev cycle tips on HASS Discovery in the past, but suspect this is more about parsing the JSON: I…

If you need more help, the community needs details like:

• What software / firmware / language / other are you using for this?
• What entity are you trying to create? (light / switch / dimmer - all different)
• What does MTT Explorer show in your topics?

If this helps, this post!

[Tantalum]

I have got the temperature, voltage, power, current sensors to be recognized
You were right, start simple and build up.

But there is one entity I don’t know how to program.
I need a light entity where I can adjust the brightness and also the color temperature (1800-4000K)

I found out how to do it for the brightness, but not for the color_temp.
Any help please?

"cmps": {
    "bla1": {
      "p": "light",
      "name" : "mqtt_json_light_1",
      "obj_id": "mqtt_light",
      "uniq_id": "3823147816S",
      "state_topic" : "home/light1",
      "command_topic" : "home/light1/set",
      "brightness" : true,
      "brightness_scale" : 255,
      "supported_color_modes" : ["COLOR_TEMP"],
      "color_mode_state_topic" : "home/light1/colortemp/set",
      "bri_stat_t": "stat/mydevice/brightness",
      "bri_cmd_t": "cmnd/mydevice/brightness"
    }
	}