ESP32 Arcade stick plan

ESP32 BT Arcade

Physical design:

- 16 digital/analog headers
- 10 digital-only headers
- Configuration enable (CE) slide switch
- Configuration clear  (CC) microswitch

Initial configuration flow

- Slide CE to "on"
- Plug into USB
    - If AP had already been configured, press "clear"
- WiFi (sans config) comes online as an access point, grants self IP of 192.168.1.1
- User connects to AP, and provides WiFi credentials and hostname.  Hostname defaults to `gamepad{XX}`, where 
  XX is a randomly chosen number

Hardware configuration flow

- Slide CE to "on"
- Connect to "{hostname}.local"
- Click on pins to change their mode
- Drag connections from pins to gamepad representation
- Configuration is updated in real-time

Operation:

- While connected to USB, should behave as webserver and USB gamepad
- While powered without USB, should behave as bluetooth gamepad without webserver