MQTT Discovery: missing state_class for power sensors in Home Assistant

MQTT Discovery: missing state_class for power sensors in Home Assistant - Printable Version

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+--- Thread: MQTT Discovery: missing state_class for power sensors in Home Assistant (/showthread.php?tid=9741)

MQTT Discovery: missing state_class for power sensors in Home Assistant - dominique_manas@hotmail.com - 08-13-2026

Hello,
I noticed an issue with the MQTT Discovery configuration generated by the N30 when the device is integrated into Home Assistant.
For example, Home Assistant creates the following entity:

Code:
sensor.n30_d0cf13020244_energy2_ch2_power

The N30 publishes this MQTT Discovery payload:

Code:
{

  "uniq_id": "D0CF13020244_sensor_energy2_power_ch2",

  "~": "homeassistant/sensor/D0CF13020244energy2_power_ch2",

  "name": "energy2_ch2.power",

  "device": {

    "name": "N30-D0CF13020244",

    "identifiers": "D0CF13020244",

    "manufacturer": "KinCony",

    "model": "N30"

  },

  "config_topic": "~/config",

  "avty_t": "D0CF13020244/avail",

  "unit_of_meas": "W",

  "dev_cla": "power",

  "val_tpl": "{{ value | float | round(1) }}",

  "stat_t": "~/state"

}

In Home Assistant, the entity is therefore detected with:

Code:
device_class: power

unit_of_measurement: W

but without:

Code:
state_class: measurement

The missing field in the MQTT Discovery payload is:

Code:
"stat_cla": "measurement"

Interestingly, some other N30 power sensors are correctly detected by Home Assistant with:

Code:
state_class: measurement

unit_of_measurement: W

device_class: power

For example,

Code:
sensor.n30_bl0910_1_power_6

already has the correct

Code:
state_class

.
This suggests that the issue is specific to some of the MQTT Discovery configurations generated by the N30 firmware, particularly the

Code:
energy*_ch*_power

sensors.
Could you please check the N30 firmware and add:

Code:
"stat_cla": "measurement"

to the MQTT Discovery configuration of all instantaneous power sensors?
The expected configuration would be:

Code:
"unit_of_meas": "W",

"dev_cla": "power",

"stat_cla": "measurement"

This would allow Home Assistant to correctly identify these entities as power measurements and use them properly for statistics and energy-related features.
Thank you.

RE: MQTT Discovery: missing state_class for power sensors in Home Assistant - admin - 08-13-2026

we will check and feedback later.