MQTT协议是一个应用层协议，他要求使用的传输层协议能提供有序的，可靠的双向字节流传输服务。

适用于ESP32和ESP8266板、树莓派Pico的外壳3D模型

RP2040 Datasheet

In this book, we’ll look at how to get started with this hardware, and how to work with other electronic components. By the end of the book, you’ll know how to create your own programmable electronic contraptions.

The SDK (Software Development Kit) provides the headers, libraries and build system necessary to write programs for RP2040-based devices such as Raspberry Pi Pico in C, C++ or Arm assembly language.

This book is about the official MicroPython port for RP2040-based microcontroller boards.