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Updating my question. When I checked the bluetooth device settings in my Windows computer I noticed that there are no Manufacturer and Model information. I guess that because of this no lenovo drivers are used.

So my question is how do I get Puck.js to be identified as a Lenovo keyboard?

Interesting. I was still unable to get it work. It seems that the key is not actually a part of the keyboard. When I try to monitor my key presses with "showkey -a" it does not catch the key press at all.

Is there any other options to mute my microphone? I'm thinking of registering Puck.js as a headset?

ed@edhome:~$ showkey -a

Press any keys - Ctrl-D will terminate this program

a 	 97 0141 0x61
b 	 98 0142 0x62
c 	 99 0143 0x63
d 	100 0144 0x64

Hi!

I've been trying to use my Puck.js to emulate Lenovo keyboard microphone on/off button (f4), but cannot get it to work. I suppose that I need to somehow first tell the computer that my Puck.js is a lenovo keyboard and then send a right code.

I can see from the lenovo drivers that the code I should send is "0x00f1".
https://coral.googlesource.com/linux-imx/+/refs/tags/4-2/drivers/hid/hid-lenovo.c

Any ideas regarding this?

Here's my current code:

function p(c,cb) {
  NRF.sendHIDReport(c, function() {
    NRF.sendHIDReport(0, cb);
  });
}

setWatch(function(e) {
  // Measure length of the press
  var len = e.time - e.lastTime;

  p(0x00f1,function() {
    print('Done');
  });

  digitalPulse(LED3,1,100);

}, BTN, { edge:"falling",repeat:true,debounce:50});