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There is a bug regarding this dependency:

me-no-dev/ESP Async WebServer@^1.2.3

I replaced that line with https://github.com/me-no-dev/ESPAsyncWebServer.git to get it to compile, but that's not a real solution. You can see the error discussed here:

me-no-dev/ESPAsyncWebServer#1147

Could you help find the right way to fix it?

It looks like you have an IFDEF to have this project run on an ESP8266, could you help provide some tips about making this run on an ESP8266/ESP8285? I have some DoIt MX Devboards and a lot of ESP-01s boards. I don't know if it can run on those or not, but I would like to at least get it to run on the dev boards. I changed my platformio.ini to this:

[env:esp32dev]
platform = espressif32
board = esp32dev
framework = arduino
monitor_speed = 115200
lib_deps =
https://github.com/OSSLibraries/Arduino_MFRC522v2.git
Wire
Wifi
FS
SPIFFS
https://github.com/me-no-dev/ESPAsyncWebServer.git
bblanchon/ArduinoJson@^6.19.4

[env:espmxdevkit]
platform = espressif8266
board = espmxdevkit
framework = arduino
monitor_speed = 115200
lib_deps =
https://github.com/OSSLibraries/Arduino_MFRC522v2.git
Wire
ESP8266WiFi
FS
SPIFFS
me-no-dev/ESP Async WebServer@^1.2.3
bblanchon/ArduinoJson@^6.19.4

It will allow compiling for the ESP32, but not for the 8266. I get the following warnings and errors:

Library Manager: Installing FS
Warning! Could not find the package with 'FS' requirements for your system 'windows_amd64'
Library Manager: Installing SPIFFS
Warning! Could not find the package with 'SPIFFS' requirements for your system 'windows_amd64'
src\main.cpp:116:8: warning: 'SPIFFS' is deprecated: SPIFFS has been deprecated. Please consider moving to LittleFS or other filesystems. [-Wdeprecated-declarations]
src\main.cpp:116:25: error: no matching function for call to 'fs::FS::begin(bool)'

SPIFFS is deprecated, so it would probably be a good idea to replace it with LittleFS, but LittleFS has a minimum of 4k allocation unit per file while SPIFFS had only 256 bytes. I don't know if the way you are using the file system would fit on an ESP-01s yet, but it would be pretty cool to have this run on a fingernail sized board!

I appreciate any help you can provide, even to just point me in the right direction about how to fix the issues. Thank you!

Hello, I tried to make your code work for another project and I found that the WebSocket event handler seems can't handle connection lost. I wonder what happens if my connection is suddenly lost while I am holding the button. It seems that because the server can't receive the stop message then the drone will continue running. I did some research and find that the ping pong method maybe useful. But I also noticed that there are only a few blogs & projects which use or mention this method. So I wondering whether I am totally wrong or maybe there is more elegant way to achieve that or websocket & esp32 is just not suitable for these kinds of work.