Gamepad using nRF52832 chip works for some android games, but not for some others, and only partially work for some other other.

[user64x]

Hello,

We have developed a new type of smartphone gamepad using the nRF52832 chip.  But for some reason, it works for some games and not for others.  And only partially work for some others games.  We compared the games with cheap generic gamepads off of ebay and the cheap generic gamepad works for all these games.  We really can't figure out why this is.

We are willing to contract someone to look over our source code to see why is this happening.

Thank you

Duncan

[ovrebekk]

Hi Duncan

Normally issues like these come down to the HID descriptor used. If it differs between your implementation and the cheap generic gamepads you tested the first I would try is to replicate their HID descriptor and see if it solves the issue. 

Do you have the means to get a sniffer trace when connecting the generic gamepad?
Then you can get the HID descriptor quite easily from the Bluetooth communication after you first establish a connection. 

Best regards
Torbjørn

[user64x]

I will look into that.  Are there any sniffer trace methods or apps that you would recommend?

Thank you

[ovrebekk]

Hi Duncan

For best performance nothing beats a proper Bluetooth sniffer like the one from Ellisys, but these are very expensive. 

A much cheaper option is to use the Nordic sniffer solution, documented here, which allows you to sniff Bluetooth packets using a normal nRF devkit or dongle and a PC.  

For picking up the service discovery and HID report exchange the Nordic sniffer should be more than sufficient. 

Best regards
Torbjørn

[user64x]

I will get a nRF devkit.  Thank you for your help.

[ovrebekk]

I'm happy to help Duncan, the best of luck with your project