DevCon23 - Talking to Cellular Modems
They are inseparable parts of most IoT products, but how to talk to them? Simply over a UART with AT commands, correct? Yes, but there's more to it, especially when it comes to the most frequent issues about maintaining active network connection while keeping the command interface up or switching to low power modes.
This contribution will provide an overview of different methods, modes, and protocols used when communicating with Cellular Modems and refer to the solutions for ESP-IDF users. We will show how to multiplex commands and network data, how to use multiple terminals, and how AT commands could be used for networking even with standard protocol libraries (e.g. esp-mqtt).
Link to the presentation: https://dl.espressif.com/public/DevCo...