Packet.Kiss.Serial 0.22.0

Packet.Kiss.Serial

Generic serial-port KISS modem for any TNC that speaks standard KISS over USB-CDC or a hardware UART.

KissSerialModem opens a serial port, runs a background read pump, and surfaces inbound KISS frames as an async stream — implementing the neutral IAx25Transport seam so the rest of the stack can move AX.25 frames without caring that the wire is a serial KISS TNC. Part of Packet.NET, a .NET amateur-radio / AX.25 packet stack.

Install

dotnet add package Packet.Kiss.Serial

Quick start

using Packet.Ax25.Transport;
using Packet.Kiss;
using Packet.Kiss.Serial;

// Open the port and start the background read pump (defaults to 57600 baud).
await using var modem = KissSerialModem.Open("/dev/ttyACM0");

// Apply CSMA channel-access parameters (KISS TXDELAY / PERSIST / SLOTTIME).
await modem.SetTxDelayAsync(30);      // 300 ms keyup delay (units of 10 ms)
await modem.SetPersistenceAsync(63);
await modem.SetSlotTimeAsync(10);     // 100 ms slot

// Send an AX.25 frame body. It's KISS-encoded (escaped + FEND-framed) as a Data frame.
await modem.SendFrameAsync(ax25FrameBytes);

// Pull every inbound KISS frame until the modem is disposed.
await foreach (KissFrame frame in modem.ReadFramesAsync())
{
    if (frame.Command == KissCommand.Data)
        Console.WriteLine($"RX {frame.Payload.Length} bytes on port {frame.Port}");
}

Because KissSerialModem implements IAx25Transport, you can also hand it to anything that takes a transport and consume only AX.25 Data frames (non-Data KISS commands are filtered out, and each frame is stamped with a receive time):

IAx25Transport transport = modem;
await transport.SendAsync(ax25FrameBytes);
await foreach (Ax25InboundFrame inbound in transport.ReceiveAsync())
    Console.WriteLine($"AX.25 frame at {inbound.ReceivedAt}");

Plain serial KISS has no TX-completion signal, so this transport deliberately does not implement ITxCompletionTransport — sends are fire-and-forget. For NinoTNC-specific features (ACKMODE TX-completion correlation, SETHW mode switching, TX-Test frame classification) use Packet.Kiss.NinoTnc instead.

Key types

• KissSerialModem — the serial KISS transport; Open(portName, baudRate, timeProvider) opens the port and starts the read pump. Implements IAx25Transport, ICsmaChannelParams, IAsyncDisposable.
• KissSerialModem.ReadFramesAsync / FrameReceived — pull (async stream) or push (event) access to inbound KISS frames.
• KissSerialModem.SendFrameAsync / SendKissAsync — send an AX.25 body as a KISS Data frame, or an arbitrary KISS command.
• KissSerialModem.SetTxDelayAsync / SetPersistenceAsync / SetSlotTimeAsync / SetTxTailAsync / SetFullDuplexAsync — the KISS CSMA channel-access parameters.

See also

• Source & issues
• Packet.Kiss — the KISS framing codec (encoder/decoder, KissFrame, KissCommand) this builds on.
• Packet.Kiss.NinoTnc — NinoTNC-specific extensions (ACKMODE, SETHW, frame classification).
• Packet.Ax25.Transport.Abstractions — the IAx25Transport seam this implements.

MIT-licensed. Part of the Packet.NET stack.