UART
Define voltage, baud rate and flow control.
Устройства и способы подключения
Спецификация, подключение и рекомендации по реализации: Устройства и способы подключения.
USB CDC
Treat reads as a continuous byte stream.
Bluetooth serial
Handle disconnect, fragmentation and reconnect.
TCP serial bridge
Preserve protocol bytes without added text.
Integration principle
Keep handshake, parser, subscription and PTT lease state per port; moving or transmitting equipment must retain a manual stop path.