Unfortunately I find that the internet can be sadly a fertile place for a frank exchange of views, which normally would never happen in a traditional face-to-face or even a phone exchange.
Truce / reset?
Can NOMone Desktop support a Logitech Unifying USB dongle paired with a K400 or K400r combined keyboard and trackpad
Re: Can NOMone Desktop support a Logitech Unifying USB dongle paired with a K400 or K400r combined keyboard and trackpad
By all means! Glad we are on the same page again

And we've fixed the issue

https://desktop.nomone.com/Download/
Or wait for the Google Play version (we still have some more work to do before the next release, so it's going to be a while).
Turns out, it's a keyboard + mouse combo issue! In Android, pressing the mouse right button generates a mouse event and a keyboard event too, a back key press. So, in order to avoid sending these back key-presses to Linux, we filter the events using the source. If the event is triggered by a mouse, it's not sent to the keyboard handling altogether. That was the whole problem. Some keyboard + mouse/trackpad combos identify themselves as a single device that is both a keyboard and a mouse. So, even though the key-events were actually from the keyboard, because their origin is also a mouse, they were filtered out.
Sorry for the inconvenience, hopefully it's fixed now. If you ever run into issues, we'd love to help

Re: Can NOMone Desktop support a Logitech Unifying USB dongle paired with a K400 or K400r combined keyboard and trackpad
FYI Using the 18th October nightly build, I've managed a quick test of three Logitech 'combo' keyboards and trackpads. I used their USB hardware dongles, to connect to an Android mobile and they all seem to work just fine. They are:
1) Logitech K400
2) Logitech K400r
3) Logitech K600
The mobile spec was: Samsung Galaxy A51 2019, 128 GB internal storage, 6GB RAM, Android 10.0.
Many thanks for your help on this. Looking forward to the next Google Play release.
1) Logitech K400
2) Logitech K400r
3) Logitech K600
The mobile spec was: Samsung Galaxy A51 2019, 128 GB internal storage, 6GB RAM, Android 10.0.
Many thanks for your help on this. Looking forward to the next Google Play release.
Re: Can NOMone Desktop support a Logitech Unifying USB dongle paired with a K400 or K400r combined keyboard and trackpad
Thank you for confirming with us that this issue is fixed 
We are currently working on updating the Linux image and will be releasing the new apk on Google Play shortly after that if Allah wills.

We are currently working on updating the Linux image and will be releasing the new apk on Google Play shortly after that if Allah wills.