MQTT Json Sensor not working

Configuration
,
1

Hello guys,

I have a problem with creating a sensor out of my Seplos Battery MQTT message:

image
image1238Ă—818 40.1 KB

I updated my configuration.yaml with:

# Seplos Batterie 1 RS485
  - platform: mqtt
    name: "seplos1_battery_remaincapacity"
    state_topic: "Seplos/Seplos_52c0a1/AllJsonData"
    unit_of_measurement: "Ah"
    value_template: "{{ value_json.RemainCapacity }}"
  - platform: mqtt
    name: "seplos1_battery_voltage_diff"
    state_topic: "Seplos/Seplos_52c0a1/AllJsonData"
    unit_of_measurement: "V"
    value_template: "{{ value_json.value.CellDiffMv }}"
  - platform: mqtt
    name: "seplos1_battery_cycles"
    state_topic: "Seplos/Seplos_52c0a1/AllJsonData"
    unit_of_measurement: ""
    value_template: "{{ value_json.value.BatteryCycles }}"

I tried a lot of configurations but could not get it running, i also read a few other threads and also the help file, but already wasted some hours.
Could anybody help me out?
Thanks, best regards,
Dominik

2
  1. Is an MQTT broker installed and is functional?
  2. Is the MQTT integration installed and is functional?
  3. Are the three MQTT Sensors defined under the sensor: key in configuration.yaml?
  4. Did you either execute Reload Manually Configured MQTT Entities or restart Home Assistant?
  5. Are there relevant error messages in the Log?
3

1.yes see first screen shot. Mqtt messages are published on the configured topic
2.yes many other sensors already work for a long time
3. Yes see the posted cutout of my config it is under sensor.
4. Restarted HA many times
5. No errors in this mosquitto broker log.

4

I understand that Topics are case sensitive. Try Seplos/SEPLOS_52c0a1/AllJsonData.

2 Likes
5

Bingo!

From MQTT Essentials:

Screenshot_20220618-175547~2
Screenshot_20220618-175547~21348Ă—159 21.2 KB

6

@123 @wmaker You guys are the best, thank you very much for solving the issue and helping me out of my stupidness! Awesome

7

Great! If you would, mark this as the solution.

8

Hello,

I have a somehow similar problem. My ESP8266 Arduino sends MQTT topics to Mosquito Broker. And it is successfully received in HA. Below is the extract from MQTT Settings page:

Listen to a topic
 
Listening to
vrane/meteo1/env
 
Message 0 received on vrane/meteo1/env at 21:04:
{
    "data": {
        "Temp": 23.75,
        "humid": 51.02929688,
        "press": 993.3134155,
        "batt": 1.771000028
    }
}
QoS: 0 - Retain: false

So ESP8266 sends topics, MQTT is properly configured and receives topics.

I have configured sensors in the configuration.yaml as follows:

mqtt:
  sensor:
    - name: 'Meteo_Temperature'
      state_topic: 'vrane/meteo1/env'
      unit_of_measurement: '°C'
      value_template: '{{ value_json.Temp }}'
    - name: "Meteo_Humidity"
      state_topic: "vrane/meteo1/env"
      unit_of_measurement: "%"
      value_template: "{{ value_json.humid }}"        
    - name: "Meteo_Pressure"
      state_topic: "vrane/meteo1/env"
      unit_of_measurement: "hPa"
      value_template: "{{ value_json.press }}"    
    - name: "Meteo_Battery"
      state_topic: "vrane/meteo1/env"
      unit_of_measurement: "V"
      value_template: "{{ value_json.batt }}"

But I am not able to get rid of this error from Logs. I probably do some silly mistakes, but I cannot solve them.

Logger: homeassistant.helpers.template
Source: helpers/template.py:582
First occurred: 20:55:14 (428 occurrences)
Last logged: 21:09:23

Template variable warning: 'dict object' has no attribute 'Temp' when rendering '{{ value_json.Temp }}'
Template variable warning: 'dict object' has no attribute 'humid' when rendering '{{ value_json.humid }}'
Template variable warning: 'dict object' has no attribute 'press' when rendering '{{ value_json.press }}'
Template variable warning: 'dict object' has no attribute 'batt' when rendering '{{ value_json.batt }}'

Other MQTT sensors (Tasmota) already work for a long time
I have restarted HA many times
No errors in this Mosquitto broker log.

Can you please advise?

Thank you, Leon

9

Those warning messages will appear if the received payload doesn’t look like the example you posted. In other words, if the payload isn’t a dictionary containing a Temp key then this template {{ value_json.Temp }} will fail.

Try this version:

      value_template: '{{ value_json.Temp if value_json.Temp is defined else this.state }}'
10

@123 Thank you. I will try.
Nevertheless, the example is taken directly from MQTT Mosquitto, from the menu “Listen to topic” and this is exactly what is received inside HA. If I understand well this version will avoid the error in the log, but will not read the value from MQTT message.

 value_template: '{{ value_json.Temp if value_json.Temp is defined else this.state }}'
11

Now that I look more closely at what you posted I realize I failed to pay close attention to the payload’s format. :man_facepalming:

Change this:

      value_template: '{{ value_json.Temp }}'

to this:

      value_template: '{{ value_json.data.Temp }}'
1 Like
12

Hello @123 ,

🤦🤦🤦This is it!
THANK YOU!!!

1 Like
13

Hi, I have a Seplos BMS how did you get the messages into MQTT?