ESP32 firmware to display 8x8 icons coming from IconViewer web app

Setup

• Build and upload with Platform.IO
• Provision with Espressif BLE provisioning app for Android or iOS

If reprovisioning is needed: hold boot button (GPIO0) for 5 seconds to clear wifi credentials.

APIs

All of these should respond to OPTIONS correctly and support CORS (from any origin)`.

• /brightness
  • PUT a text/plain brightness value (0-255)
• /correction
  • PUT a text/plain LED type correction enum; 0-5 where 0 is UncorrectedColor and 1-4 are the possible values from FastLED, in order
• /temperature
  • PUT a text/plain color temperature enum; 0-5 where 0 is UncorrectedTemperature and 1-19 are the possible values from FastLED, in order
• /icon
  • POST an 'application/octet-stream' representing an icon (see protocol definition below)
  • DELETE the currently displayed icon

Icon protocol definition

byte 0: number of frames
bytes 1-4: 32 bit int duration of frame in ms
bytes 5-192: 8x8x3 frame data (row major, 0 in top left, RGB (no alpha channel) color data for one frame)
bytes 193-196: duration of next frame
... etc