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diff --git a/docs/PACKET-RADIO.md b/docs/PACKET-RADIO.md new file mode 100644 index 0000000..5876ff3 --- /dev/null +++ b/docs/PACKET-RADIO.md @@ -0,0 +1,46 @@ +# Packet Radio & AX.25 · MAX25-Stack 1.8.0 + +Technical reference for on-air and host-side AX.25/KISS behaviour in MAX25. + +## Layer matrix + +| Layer | MAX25 owns | +|-------|------------| +| Operator UI | `max25-terminal` | +| Session / IPC | `max25d` M25/1 | +| Device prep | boot-wait, modprobe, KISS PTY | +| AX.25 codec | `ax25_codec.py` / `kiss_bridge.py` | +| KISS framing | FEND/FESC, port nibble | +| HyBBX attach | external — after stack up | + +## Address matrix + +| Rule | Value | +|------|-------| +| Call body | 1–6 chars A–Z/0–9 | +| SSID | `-0` … `-15` | +| Path order | DEST → DIGI* → SOURCE | + +## KISS matrix + +| Item | Rule | +|------|------| +| FCS on DATA to TNC | stripped — TNC adds on air | +| KISS return recovery | `0xC0 0xFF 0xC0` before prep | +| MYCALL | MAX25 prep — not HyBBX | + +## CRDOP note matrix + +| Item | Value | +|------|-------| +| Device id | `soft-crdop` | +| Speed | 1200 bd primary, up to 19200 bd | +| Duplex | half and full | +| TCP ports | 8515 control / 8516 data | + +## Related + +| Goal | Doc | +|------|-----| +| Device workflow | [PLUGINS-DEVICE-MODEL.md](PLUGINS-DEVICE-MODEL.md) | +| HyBBX | [HYBBX.md](HYBBX.md) | |