Struggling to setup my first Tasmota device and MQTT

[cw-kid]

[cw-kid]

The formatting in the reator.yaml file looks OK ? I am using notepad ++

But anytime I try to add the new MQTT Controller section and restart MSR it doesn't load the config. if I remove that new section. save and restart MSR then it does load the config as I see my other Vera controllers then in Entities.

[toggledbits]

Sorry, my bad, change the include section to look like this (I'll fix the example above as well):

        include: 
          - tasmota_generic_relay
          - tasmota_sensor_temperature_humidity

Also, you can use yamllint.com to sanity-check your entire config file.

[CatmanV2]

MQTT Explorer is good for troubleshooting to make sure your data is actually getting to the broker IME

C

[cw-kid]

@toggledbits said in Struggling to setup my first Tasmota device and MQTT:

include:
- tasmota_generic_relay
- tasmota_sensor_temperature_humidity

Thanks, now MSR reads the reactor.yaml file as it shows me the Vera controllers etc. But I am seeing this alert now:

"controller "Mosquitto" (undefined mqtt) could not be loaded at startup due to error. See the log."

I looked in the reactor.log and all its rotations but could not see any mention of MQTT.

I also checked the reactor.yaml file on that website and it says its valid.

i then changed this "interface: MQTTController" to this "implementation: MQTTController" and restarted and now I can see the MQTT Controller again under Entities.

I then waited like 10 minutes to see if any new "fan_controller" devices would appear ? And nothing does. Searching the logs again for "mqtt" there are no search matches. Also cannot see a mqtt-topics.log file in the logs folder.

If I run this command on the MSR / MQTT Broker box.

mosquitto_sub -v -t 'tele/fan_controller/#' -t 'stat/fan_controller/#'

Eventually some data from the ESP / Tasmota comes in:

tele/fan_controller/LWT Online
tele/fan_controller/STATE {"Time":"2026-02-15T11:59:06","Uptime":"0T14:12:43","UptimeSec":51163,"Heap":120,"SleepMode":"Dynamic","Sleep":50,"LoadAvg":19,"MqttCount":3,"Berry":{"HeapUsed":4,"Objects":50},"POWER":"OFF","Wifi":{"AP":1,"SSId":"ASUS_86_2G","BSSId":"04:D9:F5:74:C5:E0","Channel":10,"Mode":"HT40","RSSI":98,"Signal":-51,"LinkCount":2,"Downtime":"0T00:00:04"},"Hostname":"fan-controller-7192","IPAddress":"192.168.0.49"}
tele/fan_controller/SENSOR {"Time":"2026-02-15T11:59:06","AM2301":{"Temperature":15.6,"Humidity":62.1,"DewPoint":8.4},"TempUnit":"C"}

I see data for the temp sensor and I assume "POWER":"OFF" is the Relay / Switch state, as it is currently off.

[cw-kid]

@CatmanV2 said in Struggling to setup my first Tasmota device and MQTT:

MQTT Explorer is good for troubleshooting

Thanks I will check that out.

[cw-kid]

Reading the help page it shows this example config. I don't know what this channel number does? I didn't see a setting for setting a channel number in the Tasmota web UI. However I see there is a "channel" I saw in the data stream in the terminal mine mentioned channel 10. So I tried adding that also into my config.

EDIT: Current Control Channel: 10 appears to be the current 2.4GHZ WIFI channel of my router, its set to AUTO so that channel will change or "channel" in the reactor.yaml something different?

config:
    source: "mqtt://127.0.0.1:1883/"
    entities:
      shelly1_stairway:
        name: "Stairway Light"
        topic: shelly1_43DFD2
        include: shelly_relay
        channel: 0

- id: mqtt
  enabled: true
  implementation: MQTTController
  name: Mosquitto
  config:
    source: mqtt://127.0.0.1:1883
    log_topics: ['tele','stat','tasmota']  # only for testing, disable when not in use (makes big log file)
    entities:
      tasmota_fan_controller:
      name: "Tasmota Fan Controller"
      topic: fan_controller  # matches topic configured in Tasmota
      unit: 1  # relay number on the device
      include: 
          - tasmota_generic_relay
          - tasmota_sensor_temperature_humidity
      channel: 10

Didn't help however adding Channel still no new entities appearing.

Just seen this also:

"notably Tasmota, do not have MQTT retain on by default (a poor choice for IoT devices, IMO). On Tasmota devices, you can turn it on by using the PowerRetain on, SwitchRetain on, SensorRetain on and StateRetain on commands in the Tasmota console."

I will run those commands now.

[cw-kid]

A.I. just been telling me how to control the Tasmota with HTTP commands can turn on / off the relay now via HTTP if need be. This commands shows everything about the Tasmota device.

http://192.168.0.49/cm?cmnd=Status%200

{"Status":{"Module":1,"DeviceName":"Tasmota","FriendlyName":["Tasmota"],"Topic":"fan_controller","ButtonTopic":"0","Power":"0","PowerLock":"0","PowerOnState":3,"LedState":1,"LedMask":"FFFF","SaveData":1,"SaveState":1,"SwitchTopic":"0","SwitchMode":[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"ButtonRetain":0,"SwitchRetain":1,"SensorRetain":1,"PowerRetain":1,"InfoRetain":0,"StateRetain":1,"StatusRetain":0},"StatusPRM":{"Baudrate":115200,"SerialConfig":"8N1","GroupTopic":"tasmotas","OtaUrl":"http://ota.tasmota.com/tasmota32/release/tasmota32.bin","RestartReason":"Software reset CPU","Uptime":"0T15:23:32","StartupUTC":"2026-02-14T20:46:23","Sleep":50,"CfgHolder":4617,"BootCount":8,"BCResetTime":"2026-02-14T20:26:13","SaveCount":48},"StatusFWR":{"Version":"15.2.0(release-tasmota32)","BuildDateTime":"2025-12-12T10:58:29","Core":"3.3.4","SDK":"5.3.4.251205","CpuFrequency":160,"Hardware":"ESP32-D0WD-V3 v3.0","CR":"430/699"},"StatusLOG":{"SerialLog":2,"WebLog":2,"MqttLog":0,"FileLog":0,"SysLog":0,"LogHost":"","LogPort":514,"SSId":["ASUS_86_2G",""],"TelePeriod":60,"Resolution":"558180C0","SetOption":["000082AB","2805C80000000600003C5A0A192800000000","00000080","00006000","00004080","00000000"]},"StatusMEM":{"ProgramSize":2086,"Free":793,"Heap":112,"StackLowMark":3,"PsrMax":0,"PsrFree":0,"ProgramFlashSize":4096,"FlashSize":4096,"FlashChipId":"16405E","FlashFrequency":80,"FlashMode":"DIO","Features":["0809","9F9AD7DF","0015A001","B7F7BFCF","05DA9BC4","E0360DC7","480840D2","20200000","D4BC482D","810A80F1","00000814"],"Drivers":"1,2,!3,!4,!5,7,!8,9,10,11,12,!14,!16,!17,!20,!21,!24,26,!27,29,!34,!35,38,50,52,!59,!60,62,!63,!66,!67,!68,!73,!75,82,!86,!87,!88,!91,!121","Sensors":"1,2,3,5,6,7,8,9,10,11,12,13,14,15,17,18,19,20,21,22,26,31,34,37,39,40,42,43,45,51,52,55,56,58,59,64,66,67,74,85,92,95,98,103,105,109,127","I2CDriver":"7,8,9,10,11,12,13,14,15,17,18,20,24,29,31,36,41,42,44,46,48,58,62,65,69,76,77,82,89"},"StatusNET":{"Hostname":"fan-controller-7192","IPAddress":"192.168.0.49","Gateway":"192.168.0.1","Subnetmask":"255.255.255.0","DNSServer1":"192.168.0.1","DNSServer2":"0.0.0.0","Mac":"7C:87:CE:2D:3C:18","IP6Global":"","IP6Local":"fe80::7e87:ceff:fe2d:3c18%st1","Ethernet":{"Hostname":"","IPAddress":"0.0.0.0","Gateway":"0.0.0.0","Subnetmask":"0.0.0.0","DNSServer1":"192.168.0.1","DNSServer2":"0.0.0.0","Mac":"00:00:00:00:00:00","IP6Global":"","IP6Local":""},"Webserver":2,"HTTP_API":1,"WifiConfig":4,"WifiPower":16.0},"StatusMQT":{"MqttHost":"192.168.0.4","MqttPort":1883,"MqttClientMask":"DVES_%06X","MqttClient":"DVES_2D3C18","MqttUser":"DVES_USER","MqttCount":3,"MqttTLS":0,"MAX_PACKET_SIZE":1200,"KEEPALIVE":30,"SOCKET_TIMEOUT":4},"StatusTIM":{"UTC":"2026-02-15T12:09:55Z","Local":"2026-02-15T13:09:55","StartDST":"2026-03-29T02:00:00","EndDST":"2026-10-25T03:00:00","Timezone":"+01:00","Sunrise":"07:58","Sunset":"18:10"},"StatusSNS":{"Time":"2026-02-15T13:09:55","AM2301":{"Temperature":15.0,"Humidity":62.2,"DewPoint":7.8},"TempUnit":"C"},"StatusSTS":{"Time":"2026-02-15T13:09:55","Uptime":"0T15:23:32","UptimeSec":55412,"Heap":112,"SleepMode":"Dynamic","Sleep":50,"LoadAvg":19,"MqttCount":3,"Berry":{"HeapUsed":4,"Objects":50},"POWER":"OFF","Wifi":{"AP":1,"SSId":"ASUS_86_2G","BSSId":"04:D9:F5:74:C5:E0","Channel":10,"Mode":"HT40","RSSI":100,"Signal":-48,"LinkCount":2,"Downtime":"0T00:00:04"},"Hostname":"fan-controller-7192","IPAddress":"192.168.0.49"}}

[therealdb]

When asking AI, be sure to send the docs, the exact page. It will be more precise. All that said, here's my config

controllers:
  - id: mqtt
    name: MQTT
    enabled: true
    implementation: MQTTController
    config:
      # omitted...
      entities:
        # dehum
        tasmota_dehumidifier:
          name: "Dehum - sensors"
          include: tasmota_sensor_temperature_humidity
          topic: "tasmota-dehum"
          source: SI7021
        tasmota_dehumidifier_switch:
          name: "Dehum - switch"
          include: tasmota_generic_relay
          topic: "tasmota-dehum"
          unit: ""

You could probably consolidate them, but I prefer to have the switch and the sensors separated: it's easier to start and to manage them.

In you case, as per the post, topic: "tasmota-dehum" should be topic: "fan_controller", while sourceshould beAM2301`.

[toggledbits]

@cw_kid in your post here the configuration you posted is incorrect -- the indenting is invalid, and that will prevent anything from working for that entity.

Honestly, I can't at this stage really get a read on where you are. Between you jumping in with random AI changes and others commenting, your config is a moving target and I can't follow it. If you want my help, I will send you a link so you can upload your config and I can look at it and potentially fix it. Otherwise, I'll let you continue to learn on your own and seek help from others.