flutter_ymodem_lib library

A pure Dart implementation of the YModem file transfer protocol for Flutter, working on Android, iOS, Windows, macOS and Linux without any native code — ideal for BLE OTA firmware upgrades.

Typical usage together with flutter_blue_plus:

final ymodem = YModem(
  fileName: 'firmware.bin',
  source: YModemFileSource('/path/to/firmware.bin'),
  onDataReady: (package) => characteristic.write(package, withoutResponse: true),
  onProgress: (sent, total) => print('$sent / $total bytes'),
  onSuccess: () => print('OTA done'),
  onFailed: (reason) => print('OTA failed: $reason'),
);

// Start (optionally with custom hello/handshake data):
ymodem.start('Customized Data');

// Feed every BLE notification from the device back to the engine:
notifyCharacteristic.lastValueStream.listen(ymodem.onReceiveData);