Matter Air Quality Sensor with MHZ19B not showing values in Apple Home

[stony2k]

PROBLEM DESCRIPTION

What I've tried

1. Configured Matter endpoint for Air Quality Sensor with MHZ19B#CarbonDioxide and MHZ19B
2. Sensor delivers correct values:
   14:03:05.045 MQT: tele/tasmota_B8CCBC/SENSOR = {"Time":"2024-12-22T14:03:05","MHZ19B":{"Model":"B","CarbonDioxide":908,"Temperature":32.0},"TempUnit":"C"}

Troubleshooting Steps

• Factory reset Matter
• Removing and re-adding the device in Apple Home
• Different Matter endpoint configurations
• Restarting Tasmota

Related Code

• Matter Air Quality Sensor Implementation
• Pull Request that added Air Quality support

Question

What am I missing to get the CO2 values showing up correctly in Apple Home? The sensor works, Matter is configured, but the values are not being transmitted correctly. According to the berry script implementation, the values should be transmitted in a correct format to Apple Home.

REQUESTED INFORMATION

Make sure your have performed every step and checked the applicable boxes before submitting your issue. Thank you!

• Read the Contributing Guide and Policy and the Code of Conduct
• Searched the problem in issues
• Searched the problem in discussions
• Searched the problem in the docs
• Searched the problem in the chat
• Device used (e.g., Sonoff Basic): Nodemcu ESP32
• Tasmota binary firmware version number used: 14.4.1.1 (3412761-tasmota32)
  • Pre-compiled
  • Self-compiled
• Flashing tools used: https://tasmota.github.io/install/
• [x ] Provide the output of command: Backlog Template; Module; GPIO 255:

18:21:03.587 CMD: Backlog Template; Module; GPIO 255
18:21:03.589 SRC: WebConsole from 10.0.2.1
18:21:03.590 CMD: Grp 0, Cmd 'BACKLOG', Idx 1, Len 26, Pld -99, Data 'Template; Module; GPIO 255'

• If using rules, provide the output of this command: Backlog Rule1; Rule2; Rule3:

  Rules output here:

• Provide the output of this command: Status 0:

18:23:07.811 CMD: status 0
18:23:07.815 RSL: STATUS = {"Status":{"Module":1,"DeviceName":"Tasmota","FriendlyName":["Tasmota"],"Topic":"tasmota_B8CCBC","ButtonTopic":"0","Power":"0","PowerLock":"0","PowerOnState":3,"LedState":1,"LedMask":"FFFF","SaveData":1,"SaveState":1,"SwitchTopic":"0","SwitchMode":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"ButtonRetain":0,"SwitchRetain":0,"SensorRetain":0,"PowerRetain":0,"InfoRetain":0,"StateRetain":0,"StatusRetain":0}}
18:23:07.855 RSL: STATUS1 = {"StatusPRM":{"Baudrate":115200,"SerialConfig":"8N1","GroupTopic":"tasmotas","OtaUrl":"http://ota.tasmota.com/tasmota32/release/tasmota32-DE.bin","RestartReason":"Software reset CPU","Uptime":"0T00:06:03","StartupUTC":"2024-12-22T17:17:04","Sleep":50,"CfgHolder":4617,"BootCount":11,"BCResetTime":"2024-12-22T18:00:19","SaveCount":25}}
18:23:07.893 RSL: STATUS2 = {"StatusFWR":{"Version":"14.4.1.1(3412761-tasmota32)","BuildDateTime":"2024.12.22 14:39:18","Core":"3_1_0","SDK":"5.3.2","CpuFrequency":160,"Hardware":"ESP32-D0WDQ6 v1.0","CR":"412/699"}}
18:23:07.911 RSL: STATUS3 = {"StatusLOG":{"SerialLog":2,"WebLog":4,"MqttLog":0,"SysLog":0,"LogHost":"","LogPort":514,"SSId":["Stony",""],"TelePeriod":300,"Resolution":"558180C0","SetOption":["00008009","2805C80001000600003C5A0A192800000000","00000080","00006000","00004000","00000020"]}}
18:23:07.952 RSL: STATUS4 = {"StatusMEM":{"ProgramSize":2019,"Free":860,"Heap":104,"StackLowMark":2,"PsrMax":0,"PsrFree":0,"ProgramFlashSize":4096,"FlashSize":4096,"FlashChipId":"16405E","FlashFrequency":40,"FlashMode":"DIO","Features":["0407","9F9AD7DF","0015A001","B7F7BFCF","05DA9BC4","E0360DC7","480840D2","20200000","D4BC482D","810A80F1","00000014"],"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,!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"}}
18:23:08.023 RSL: STATUS5 = {"StatusNET":{"Hostname":"tasmota-B8CCBC-3260","IPAddress":"10.0.0.121","Gateway":"10.0.0.1","Subnetmask":"255.255.0.0","DNSServer1":"10.0.1.22","DNSServer2":"0.0.0.0","Mac":"08:3A:F2:B8:CC:BC","IP6Global":"fdfe:9a7f:f9e:2347:a3a:f2ff:feb8:ccbc","IP6Local":"fe80::a3a:f2ff:feb8:ccbc%st1","Ethernet":{"Hostname":"","IPAddress":"0.0.0.0","Gateway":"0.0.0.0","Subnetmask":"0.0.0.0","DNSServer1":"10.0.1.22","DNSServer2":"0.0.0.0","Mac":"00:00:00:00:00:00","IP6Global":"","IP6Local":""},"Webserver":2,"HTTP_API":1,"WifiConfig":4,"WifiPower":16.0}}
18:23:08.073 RSL: STATUS6 = {"StatusMQT":{"MqttHost":"","MqttPort":1883,"MqttClientMask":"DVES_%06X","MqttClient":"DVES_B8CCBC","MqttUser":"DVES_USER","MqttCount":0,"MAX_PACKET_SIZE":1200,"KEEPALIVE":30,"SOCKET_TIMEOUT":4}}
18:23:08.090 RSL: STATUS7 = {"StatusTIM":{"UTC":"2024-12-22T17:23:08Z","Local":"2024-12-22T18:23:08","StartDST":"2024-03-31T02:00:00","EndDST":"2024-10-27T03:00:00","Timezone":"+01:00","Sunrise":"08:41","Sunset":"16:55"}}
18:23:08.120 RSL: STATUS10 = {"StatusSNS":{"Time":"2024-12-22T18:23:08","MHZ19B":{"Model":"B","CarbonDioxide":939,"Temperature":27.0},"TempUnit":"C"}}
18:23:08.142 RSL: STATUS11 = {"StatusSTS":{"Time":"2024-12-22T18:23:08","Uptime":"0T00:06:04","UptimeSec":364,"Heap":101,"SleepMode":"Dynamic","Sleep":50,"LoadAvg":19,"MqttCount":0,"Berry":{"HeapUsed":22,"Objects":278},"Wifi":{"AP":1,"SSId":"Stony","BSSId":"1C:ED:6F:F8:47:81","Channel":11,"Mode":"HT40","RSSI":54,"Signal":-73,"LinkCount":1,"Downtime":"0T00:00:04"}}}

• Set weblog to 4 and then, when you experience your issue, provide the output of the Console log:

  Console output here:

TO REPRODUCE

1. Connect the MHZ19B CO2 sensor to Tasmota.
2. Enable Matter and pair it with Apple Home.
3. Configure the Matter endpoint for Air Quality Sensor using MHZ19B#CarbonDioxide.
4. Observe the Air Quality status in Apple Home.

EXPECTED BEHAVIOUR

The CO2 values from the MHZ19B sensor should be displayed correctly in Apple Home's Air Quality widget.

SCREENSHOTS

ADDITIONAL CONTEXT

[s-hadinger]

I'm not sure what Apple supports with Air Quality Sensor. CO2 level and "Air Quality" are different values.

[stony2k]

Apple supports CO2 sensors in general but I am not sure if they are supported and implemented in Matter. Here is a, non Matter, device which I implemented via ioBroker and YAHKA for comparison. For air quality 2 datapoints are used:

CarbonDioxideLevel and AirQuality. For AirQuality I mapped CarbonDioxideLevel to different numbers for the quality level:
if (value <= 750) return 1; else if (value <= 1000) return 2; else if (value <= 1250) return 3; else if (value <= 1500) return 4; else if (value <= 1750) return 5;

This sensors have been implemented with Matter 1.2.

[s-hadinger]

Ok, I'll do some testing.

[stony2k]

Home Assistant recognises this device via matter as well, but also no values are shown:

[s-hadinger]

It should be fixed now. Please try latest in the development branch.

Note: the filter in Matter configuration should be only the overall key I9B

[stony2k]

Air Quality is now shown in Apple Home, yes. Can you have a look if it is possible to show the CO2 value as well? I should work since it is implemented for Homekit devices? https://developer.apple.com/documentation/homekit/hmcharacteristictypecarbondioxidelevel
I thinks there should be a way to display the value as well.

[s-hadinger]

Can you please send logs with weblog 3 during reporting of values ?

[stony2k]

Sure, do you need more information?
weblog_3.txt

[s-hadinger]

Everything is correct in the logs, the values for CO2 are reported to the subscriptions