BTHome: Xiaomi Temperatur Sensors show various nonsens value/ parameters like gas, ppm and more

[saschaabraham]

The problem

I have a few xiaomi ble temperature sensors (LYWSD03MMC), flashed with the latestest BTHome firmware.

The temperature/ humidity is shown as expectect, but some sensors also have gas, ppm or energy? This is not correct. The last screen is the model of the temperature sensor showed by the tlink-flasher via bluetooth.

What version of Home Assistant Core has the issue?

core-2024.8.0

What was the last working version of Home Assistant Core?

No response

What type of installation are you running?

Home Assistant OS

Integration causing the issue

BTHome

Link to integration documentation on our website

https://www.home-assistant.io/integrations/bthome/

Diagnostics information

No response

Example YAML snippet

No response

Anything in the logs that might be useful for us?

No response

Additional information

No response

[home-assistant[bot]]

Hey there @ernst79, mind taking a look at this issue as it has been labeled with an integration (bthome) you are listed as a code owner for? Thanks!

Code owner commands

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[saschaabraham]

I have removed the devices and readded them. Now the wrong entities are gone. Maybe it depends on the false encryption messages i received a few days before from other ble sensors (MI pland sensors). I don't now, if a corrupted ble package can create something like this...

[Ernst79]

In theory, that can happen, yes. Never actually seen it happen though.

[saschaabraham]

Well, it happend again. I got a message, that a plant sensor had an encryption error

and one of the temperature sensors now has one more entity (gas), which is wrong...

How can i support, to get this done?

[pvvx]

ATC_MiThermometer already includes extended versions of alternative firmware. For example, connecting a pressure sensor, 2 x MY18B20, INA226 and similar... Such variants can be compiled from source code by specifying additional parameters.

Add 2 x MY18B20:

Water tank sensor:

...

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In theory, that can happen, yes. Never actually seen it happen though.

This always occurs when the firmware is changed to a new one, with additional parameters. How to delete old displayed parameters from the database?

No new parameters for other devices were added. Only in case of firmware update with advanced capabilities with constant use of more than 60 BLE devices with reception on two USB-BT adapters. One on BT4.2, the second in LE Long Range mode for reception from distant sensors...