tinyusb VS arduino-pico

Implementing the required USB host interface is another hurdle, but tinyusb seems to have sorted most of that out, except that UAC2 is implemented as a device while you need a host.

Have a look at TinyUSB. It supports the STM32WB and demo programs for the Nucleo-WB55RG. It even offers an example for dual CDC ports, so very close to what you're looking for.

Second: Distrust, misunderstanding, and out of date opinions of C++ in embedded spaces. I often see "compatibilty" thrown around as a goal for using C and not C++, but for most modern embedded systems, C++ compilers exist and are (usually) well tuned. Arm is a shining example here*. C++ is more optimizable than C as the intent can be clearer to the compiler. C++ constexpr and templates are a godsend for embedded systems, and I used both heavily in my recent arduino and pico testing. I combined both of them for a really cool experimental USB interface descriptor builder that runs at compile time and avoids the need to count byte sizes, but I gave up on it when the maintainer said C only, despite the fact that C can't do that. I was similarly disappointed when the pico "C++" was C only, as there was no backwards compatibility necessary.

I looked at this but the fork seems to have had a lot of problems from looking at the PR: https://github.com/hathach/tinyusb/pull/1219

I think a better solution might be to use a USB flash drive in the usbc port. Unfortunately micropython and circuitpython don't support this (yet), so you'd have to use c++ https://github.com/hathach/tinyusb

It's possible to make the s3 be a mass storage device via TinyUSB. https://github.com/hathach/tinyusb/tree/master/examples/device/cdc_msc_freertos

I managed to get the Arduino IDE to work great with my Pi Pico's using earlephilhower/arduino-pico and TinyUSB in the USB stack. I can code for MIDi and do all kinds of neat stuff... But...

I am trying to build a data logger. Currently my hardware is a Raspberry Pi Pico W, a SHT41 (https://www.adafruit.com/product/5776), and a small breadboard. Software is Arduino IDE, arduino-pico (https://github.com/earlephilhower/arduino-pico), and Adafruit_SHT4X library (https://github.com/adafruit/Adafruit_SHT4X).

The standard Pico w SDK has examples for Bluetooth classic, serial connection, mouse control, keyboard control etc... Everything you need can be found HERE

If you want more guidance, you could use the Arduino framework https://github.com/earlephilhower/arduino-pico

If you are using the earlephilhower implementation of the Arduino Core for Pico, wifi is documented here: wifi docs

rp2040 is really powerful its not a conventional "desktop" raspberry pi, its a microcontroller similar to stm32 or the avr boards that the arduino uses. https://github.com/earlephilhower/arduino-pico for arduino support.

Do you want to do serial communications along with USB HID (keyboard)? Sure, you can do that with TinyUSB. I've done it with the arduino-pico core: https://github.com/earlephilhower/arduino-pico