I would like to use name_add_mac_suffix in mqtt topic_prefix

[stbungaof]

`esphome: name: mono name_add_mac_suffix: true

mqtt: broker: !secret mqtt_host username: !secret mqtt_username password: !secret mqtt_password`

It show device name and wifi hostname like this “mono-8d5128” but mqtt only show “mono” Topic Prefix: ‘mono’ State Topic: ‘mono/switch/mono_relay1/state’ State Topic: ‘mono/switch/mono_relay2/state’

Is there a way for me to change it to Topic Prefix: ‘mono-8d5128’ State Topic: ‘mono-8d5128/switch/mono_relay1/state’ State Topic: ‘mono-8d5128/switch/mono_relay2/state’

Sorry, I’m not good at English. I hope you can read and understand.

[stbungaof]

or allow to use templatable on topic_prefix and on_message: topic like mqtt.publish: topic please.

[cavamora]

really need this too

[gunnarbeutner]

I ran into this issue while trying to figure out how to use the exact same firmware image for multiple devices without having them overwrite each other's MQTT messages. I ended up with the following workaround for now:

esphome:
  name_add_mac_suffix: true
  on_boot:
    priority: 250
    then:
      - lambda: |-
          auto name = App.get_name();
          id(mqtt_client)->set_topic_prefix(name);
          id(mqtt_client)->set_birth_message(mqtt::MQTTMessage{
              .topic = name + "/status",
              .payload = "online",
              .qos = 0,
              .retain = true,
          });
          id(mqtt_client)->set_last_will(mqtt::MQTTMessage{
              .topic = name + "/status",
              .payload = "offline",
              .qos = 0,
              .retain = true,
          });
          id(mqtt_client)->set_shutdown_message(mqtt::MQTTMessage{
              .topic = name + "/status",
              .payload = "offline",
              .qos = 0,
              .retain = true,
          });
          id(mqtt_client)->set_log_message_template(mqtt::MQTTMessage{
              .topic = name + "/debug",
              .payload = "",
              .qos = 0,
              .retain = true,
          });

[Mrgove10]

Thanks @gunnarbeutner for this fix, worked like a charm. This functionality should definity come as standard if you have multiple devices with the same config to manage.

(if you get the error that the ID is undefined, try replacing id(mqtt_client) by mqtt_mqttclientcomponent )

[bdemeny]

+1 Please add support for this in ESPHome, being able to have the topic_prefix using unique_id would align with the Home Assistant fix Migrate ESPHome unique ids to new format #99451 . If the topic prefix can be unique, then it will open the to use similar firmware for multiple devices without any workarounds.

Another big thanks to @gunnarbeutner for the workaround tho!

[gfplab-scaffardi]

+1

[artin961]

+1