POC - How Embassy enables wireless communication for the Raspberry Pi Pico

A simple project demonstrating the use of the embassy crate to communicate with the Raspberry Pi Pico via WiFi. For one of my projects I want to use the Pico for measurements. The measurement data is to be sent to a gateway using the CYW43 WiFi module. Most of the firmware is just a copy of the Embassy examples. All credits go to Dario Nieuwenhuis and contributors. The protocol is mostly a copy from the demo repo of Michael Kefeder's presentation at the Rust Zürisee Meetup March 2023. Great thanks to him for his great talk. This simple project, could be a starting point for further development.

Wireless ping pong using Embassy & Postcard

With the help of Embassy, on the Raspberry Pi Pico we set up a server that listens for incoming messages (in this case a.k.a. postcards 😉). On the other side, we have a client that sends messages to the server. The server then responds to the client with a "Pong" message.

Requirements

• Raspberry Pi Pico
• Raspberry Pi Debug Probe (or any other debugger)
• some micro-usb cables
• probe-rs installed on your computer (see their website for the details: probe.rs
• cargo and rustup installed on your computer

Installation and setup

1. Clone the repository: git clone https://github.com/bartweber/embassy-rp-cyw43-poc.git
2. Power up your Raspberry Pi Pico.
3. Connect your Raspberry Pi Pico to your computer with a debugger, for example, a Raspberry Pi Debug Probe.
4. Configure the WiFi settings in firmware/config.toml. An example configuration is in the file firmware/config.toml.example.
5. Open two terminals.
   • In one terminal, flash the firmware to the Raspberry Pi Pico by running: cd firmware && cargo run.
   • In the other terminal, run the client side code by: cd clien && cargo run

If all is set up well, the RP Pico will try to connect to your Wi-Fi network and the client will start sending "Ping" messages to the server. The server will respond with "Pong" messages.