TFA Dostmann AIRCO2NTROL Coach

[alpxp]

For TFA Dostmann AIRCO2NTROL Coach version of co2meter I had to comment out the _decrypt(msg) in co2meter.py, i.e. this works:

def hid_read(self):
""" Read 8-byte string from HID device """
    return self._h.read(8)

Otherwise (None, None) is returned.

Here is the >>> mon.info

{'product_name': u'USB-zyTemp', 'vendor_id': 1241, 'serial_no': u'2.00', 'product_id': 41042, 'manufacturer': u'Holtek'}

[alpxp]

Ok, so TFA Dostmann AIRCO2NTROL Coach measures humidity as well. Humidity measurement starts with 0x41 code (learned here).

I made all the necessary changes to output the humidity, with the exception of homekit.py, which does not work for me at all. Here is the new code:
alpxp@e70c36e

Screenshots with humidity:

I think this code will not work with the Mini version out of the box, because of the encryption there, which has been commented out in alpxp@e70c36e. May be this is easy to fix by adding some kind of detection of the device version. The rest of the code should be relatively ok, as Mini returns 0 for 0x41 (humidity) by default.

[vfilimonov]

Hello @alpxp
Thanks for reporting and figuring out how to decode humidity!
Let me have a look and incorporate your code to co2meter. I suspect that I'd need to wrap _decrypt() with some flag which should be set in the beginning - my model sends encrypted messages

[vfilimonov]

Similar issue: #16
It took 8 months (🤦), but the bypass_decrypt argument has been added to master: 5d4187d

[alpxp]

Cool :)
I'm remaining on my fork for now, because I use the Humidity readings as well.
I have also implemented MQTT output to be used with the Home Assistant/Influx/Grafana etc... Might do a pull request later if this is interesting.

[Major2828]

@alpxp Could you discribe how to use your fork for MQTT Output? I woul integrate it in Home Assistant.
Thank you in Advice

[hurricup]

@Major2828 you may check https://github.com/devbis/co2mqtt
I'm using it for HA integration. Thinking about my own component, but not there yet.