Essentials for ESP32

C++17 ESP-IDF v4.1 component with boilerplate for WiFi, MQTT, configuration, persitent storage and device info.

How to use

0. Download esp-idf v4.1. There is a handy extension for VSCode which installs all stuff you need.

1. Add this repo as a submodule into components folder:

   cd my-esp-idf-project/
   git submodule add https://github.com/lubosmato/esp32-essentials.git components/essentials/

   my-esp-idf-project/
   ├── components/
   │   ├── essentials/ <--
   │   └── ...another components...
   ├── main/
   │   ├── CMakeLists.txt
   │   └── main.cpp
   ├── CMakeLists.txt
   ├── sdkconfig
   └── partitions.csv
   

2. Add binary data of web settings app and C++20 support into root CMakeLists.txt:

   cmake_minimum_required(VERSION 3.5)
   
   set(CMAKE_CXX_STANDARD 20) # <--
   
   include($ENV{IDF_PATH}/tools/cmake/project.cmake)
   project(my-esp-idf-project)
   
   target_add_binary_data(${CMAKE_PROJECT_NAME}.elf "components/essentials/resources/web/dist/app.js.gz" TEXT) # <-- (only needed by `essentials::SettingsServer`)
   target_add_binary_data(${CMAKE_PROJECT_NAME}.elf "components/essentials/resources/web/dist/index.html.gz" TEXT) # <-- (only needed by `essentials::SettingsServer`)

3. Enable exceptions in idf.py menuconfig

4. Add REQUIRES into your main CMakeLists.txt:

   idf_component_register(
       SRCS "main.cpp"
       REQUIRES essentials
   )
   

5. Build

6. Inspire from examples

Details

TODO

• Migrate to esp-idf v4.1
• Fix Esp32Storage::clear() - it mustn't clear all NVS
• Add wait for MQTT connection feature with timeout (similar as Wifi)
• Add more device info
• MQTT subscription to multi and single level (heavy feature, maybe YAGNI)
• Check all error codes and throw
• Make settings web server simpler without enormous number of route handlers
• Make settings web app smaller (overkilled by Vue.js)
• Add tests
• Use std::span when will be supported by esp-idf toolchain
• Use std::to_chars and std::from_chars for floating point types when will be implemented in GCC