The SerialPort interface shared by usb_serial_next and bluetooth_serial_next: write a protocol once and run it over USB or Bluetooth. Changelog excerpt: - First release: `SerialPort`, the `lines()`and `writeText()`helpers, and `SerialException`with `SerialError`, taken out of usb_serial_next 0.1.0 so that bluetooth_serial_next can share them. New errors for Bluetooth: `adapterOff`, `notPaired`, `connectionFailed`.

Maintained replacement for usb_serial: Arduino, ESP32 and USB-UART adapters (FTDI, CP210x, CH34x, PL2303, CDC-ACM) on Android over USB OTG, no JitPack. Changelog excerpt: - `SerialPort`, `SerialException`and `SerialError`moved to the new package serial_port_core, which this package exports, so that bluetooth_serial_next shares them; imports stay the same. - Breaking: `SerialError`has three new values for Bluetooth (`adapterOff`, `notPaired`, `connectionFailed`; a USB port never reports them), so a `switch`over it needs a default. `SerialException.fromPlatform`is gone; use `SerialException.fromCode`.

Maintained replacement for flutter_bluetooth_serial: Bluetooth Classic SPP (RFCOMM) for Android, for HC-05/HC-06, ESP32, ELM327 and printers. Changelog excerpt: - First release: Bluetooth Classic serial ports (SPP over RFCOMM) on Android. Paired devices, scanning, pairing, the Android 12+ and the older scan permissions, the "turn Bluetooth on" dialog, adapter and pairing events. - Connecting tries a secure and then an insecure link, or an RFCOMM channel for devices without a service record, within one timeout enforced by a watchdog. - Ports implement `SerialPort`from serial_port_core, like usb_serial_next; every failure is a `SerialException`with a `SerialError`.

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