mathieucarbou / MycilaWebSerial

Super lightweight web serial monitor for ESP32

MycilaWebSerial

MycilaWebSerial is a Serial Monitor for ESP32 that can be accessed remotely via a web browser. Webpage is stored in program memory of the microcontroller.

This library is based on the UI from asjdf/WebSerialLite (and this part falls under GPL v3).

Changes

• Simplified callbacks
• Fixed UI
• Fixed Web Socket auto reconnect
• Fixed Web Socket client cleanup (See WEBSERIAL_MAX_WS_CLIENTS)
• Command history (up/down arrow keys) saved in local storage
• Support logo and fallback to title if not found.
• Arduino 3 / ESP-IDF 5.1 Compatibility
• Improved performance: can stream up to 20 lines per second is possible

To add a logo, add a handler for /logo to serve your logo in the image format you want, gzipped or not. You can use the ESP32 embedding mechanism.

Preview

DemoVideo

Features

• Works on WebSockets
• Realtime logging
• Any number of Serial Monitors can be opened on the browser
• Uses Async Webserver for better performance
• Light weight (<3k)
• Timestamp
• Event driven

Dependencies

• mathieucarbou/ESPAsyncWebServer

Usage

  WebSerial.onMessage([](const String& msg) { Serial.println(msg); });
  WebSerial.begin(server);

  WebSerial.print("foo bar baz");

If you need line buffering to use print(c), printf, write(c), etc:

  WebSerial.onMessage([](const String& msg) { Serial.println(msg); });
  WebSerial.begin(server);

  WebSerial.setBuffer(100); // initial buffer size

  WebSerial.printf("Line 1: %" PRIu32 "\nLine 2: %" PRIu32, count, ESP.getFreeHeap());
  WebSerial.println();
  WebSerial.print("Line ");
  WebSerial.print(3);
  WebSerial.println();