BLE Joystick on ESP32

[francescofact]

Hi everyone,
i am trying to connect a BLE joystick to my ESP32 with micropython. But i cannot find documentation for accepting connection from bluetooth device and get the commands from the joystick.
I understood that i have to start with:

Code: Select all

bt = bluetooth.BLE()
bt.activate(1)

but i cannot understand how to go on. Thank you for your help.
Francesco

[jimmo]

Hi,

I have a proof-of-concept of a HID keyboard for BLE, which I'm working on adding to https://github.com/micropython/micropyt ... /bluetooth

It's not nearly as simple as the other peripheral examples, but most of it is just configuration, and you end up with a "send_key" method.

It should be possible to adapt the HID keyboard demo into a HID joystick (or mouse). I'll try and remember to update this thread when I finish the keyboard example.

[nikolaj]

@jimmo Did you ever post that proof of concept HID keyboard? I scanned the forums and your github fork and haven't found it.

Thanks!

[nekomatic]

According to this post there's a pull request, basically meaning Jimmo's change is submitted and waiting to be integrated into the code base.

[jimmo]

Yep, see here https://github.com/micropython/micropython/pull/6559

[mibra]

You can check my "mouth" mouse if you need a practical example.

https://github.com/mibragri/mouthMouse

BLE py file: https://github.com/mibragri/mouthMouse/ ... KBMouse.py

joystick py file: https://github.com/mibragri/mouthMouse/ ... oystick.py

You may need to strip some code. The joystick class includes a water flow sensor for registering puffing as clicks.

Regards
Michael

[Heerkog]

I'm using the examples above to code a HID library, but somehow my Windows box isn't receiving or registering my input reports.

My code is here: https://github.com/Heerkog/MicroPythonBLEHID

Does anyone know what I'm doing wrong?

[Heerkog]

Solved.

The issue is that the mouse example I used includes a HID report descriptor that is missing report id 1.
Without that report id, the HID report reference characteristic's id is pointing to a non-existing report.

In addition, any HID service requires the registration of
- a Device Information service with minimally the PnP id characteristic, and
- a Battery service with the Battery level characteristic.

Although Linux and Android skip over the errors raised by the missing information, Windows does not.

I'll push code later.

[Jeroavf]

Hi Heerkog,
Can you please update your repository ?
Thanks in advance

[Heerkog]

Pushed! Sorry for the wait!