NimBLE-Arduino VS ESP32-BLE-Gamepad

The code will be built using the esp32-nimble crate. The esp32-nimble crate is a wrapper for the ESP32 NimBLE Bluetooth stack. The crate is inspired by the NimBLE-Arduino project. NimBLE is an open source BLE stack fully compliant with the Bluetooth specification providing both host and controller functionalities. NimBLE is also part of the Apache MyNewt project. The ESP-IDF supports only a port of the NimBLE host stack and provides a different controller implementation.

I originally tried using the ESP32 blue BLE library. I ran out of memory. Switched to NimBLE-Arduino, an Arduino fork of Apache NimBLE, a replacement open-source BLE library https://github.com/h2zero/NimBLE-Arduino https://www.arduino.cc/reference/en/libraries/nimble-arduino/ https://h2zero.github.io/esp-nimble-cpp/md__migration_guide.html#autotoc_md46

I like NimBLE-Arduino, and this has a BLE client example that you can adapt to your needs, including both regular reads and notifications. Note that this isn't pure C++, this is using Arduino. There's also a version for use with ESP-IDF: esp-nimble-cpp, with a corresponding BLE client example. The examples for both projects are heavily commented and quite easy to follow.

On the ESP32 side, I use this repo for Bluetooth connectivity: https://github.com/h2zero/NimBLE-Arduino

u/Marijn_fly's is the cleanest solution I can think of but if you're ready to get your hands dirty, there's another BLE library called NimBLE that's massively smaller that the one you're using. Plus I'm an incompetent noob and I find it being easier to work with :D

I recently also looked into this and the NimBLE GitHub and examples helped me a lot to implement this. Source: https://github.com/h2zero/NimBLE-Arduino

Try to implement a driver myself using the NimBLE stack. However, I don't know where to start working with a BLE gamepad.

You indeed need an advertisement packet scanner. Arduino version could be e.g. this: https://github.com/h2zero/NimBLE-Arduino/blob/master/examples/BLE_Beacon_Scanner/BLE_Beacon_Scanner.ino

Trying to find premade code to make an xbox style controller for Steam. I have looked into it before but what I found isn't exactly clear. https://github.com/lemmingDev/ESP32-BLE-Gamepad This was the code I found but I don't understand what they define as a "hat" and how you're supposed to get 128 buttons.

Conveniently, I had a spare ESP32 board sitting in a drawer (which is not an Arduino and technically makes the title of this post innacurate, I know), and a quick Google search showed that some legendary human being had already done the hard work of writting an Arduino library to create Bluetooth wireless gamepads on ESP32. The stage was set!

Absolutely! It's quite a bit more complicated, but someone else has already put their code on GitHub for one: https://github.com/lemmingDev/ESP32-BLE-Gamepad

I simply want the controller to be able to function as a single full-fledged controller (with all the buttons of a regular controller) but also have the functionality of being split into two smaller/simpler controllers. For a smaller handheld, I was able to create a simple bluetooth controller using an ESP32-WROOM-32 and the ESP32-BLE-Gamepad library by lemmingDev.

Googling ESP32 Bluetooth game pad shows that there are libraries so I assume it's possible.

I used the ESP32-BLE-Gamepad library and changed up the flight controller example code slightly. I’d appreciate any advice, thanks!

Yes, with an ESP32 and the Bluetooth LE Gamepad library.

This is the library I used.

Have you looked at this one? https://github.com/lemmingDev/ESP32-BLE-Gamepad