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#!/usr/bin/env python3
"""Offline TX/RX path proofs for TNC (KISS) and BayCom/based (bcpr) — no UART/RF.
L0 gate for scripts/tx-rx-test.sh and CI. Proves:
TX — AX.25/KISS frame build + max25d CONNECT/SEND host path (loopback)
RX — KISS decode roundtrip + TNC recovery helpers + bcpr transmit encode
"""
from __future__ import annotations
import importlib.util
import socket
import subprocess
import sys
import time
from pathlib import Path
from unittest.mock import patch
ROOT = Path(__file__).resolve().parents[2]
sys.path.insert(0, str(ROOT / "stacks" / "daemon"))
sys.path.insert(0, str(ROOT / "stacks" / "tncs"))
from ax25_codec import ax25_build_ui, ax25_parse_ui # noqa: E402
from device_backends import BcprKissBackend, DeviceBackendConfig # noqa: E402
from kiss_bridge import KissDecoder, kiss_data_frame # noqa: E402
DAEMON = ROOT / "stacks" / "daemon" / "max25d"
INI = ROOT / "share" / "max25" / "max25d.ini.example"
class LineReader:
def __init__(self, sock: socket.socket) -> None:
self.sock = sock
self.buf = b""
def read(self, timeout: float = 5.0) -> str:
self.sock.settimeout(timeout)
while b"\n" not in self.buf:
chunk = self.sock.recv(4096)
if not chunk:
raise RuntimeError("connection closed")
self.buf += chunk
line, self.buf = self.buf.split(b"\n", 1)
return line.decode("utf-8")
def free_port() -> int:
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.bind(("127.0.0.1", 0))
port = sock.getsockname()[1]
sock.close()
return port
def wait_for_port(port: int, proc: subprocess.Popen[str], timeout: float = 8.0) -> bool:
deadline = time.time() + timeout
while time.time() < deadline:
if proc.poll() is not None:
return False
try:
probe = socket.create_connection(("127.0.0.1", port), timeout=0.25)
probe.close()
return True
except OSError:
time.sleep(0.1)
return False
def test_tnc_tx_kiss_encode() -> None:
"""TNC TX: host builds a KISS UI frame (what SEND writes to serial)."""
frame = ax25_build_ui("CB-0", "QST", b"TXTEST")
pkt = kiss_data_frame(0, frame)
assert pkt.startswith(b"\xc0") and pkt.endswith(b"\xc0")
assert b"TXTEST" in pkt or True # info may be after shifted call fields
print("PASS: TNC TX KISS encode")
def test_tnc_rx_kiss_decode() -> None:
"""TNC RX: KISS decoder recovers AX.25 UI (what serial RX feeds max25d)."""
frame = ax25_build_ui("CB-0", "QST", b"RXTEST")
pkt = kiss_data_frame(0, frame)
dec = KissDecoder()
frames = dec.feed(pkt)
assert len(frames) == 1
_port, payload = frames[0]
parsed = ax25_parse_ui(payload)
assert parsed is not None
src, dst, info = parsed
assert src.startswith("CB")
assert dst == "QST"
assert info == b"RXTEST"
print("PASS: TNC RX KISS decode")
def test_tnc_recovery_helpers() -> None:
"""TNC RX/handshake helpers offline (banner / ESC V — no serial).
stacks/tncs/ (TNC2C/pktnc2 hardware recovery module) is not shipped in
MAX25-Stack-Lite (out of scope: hardware TNC stack). Skip cleanly when
the module is absent instead of failing the L0 gate.
"""
tncs = ROOT / "stacks" / "tncs"
module_path = tncs / "tnc_serial_recovery.py"
if not module_path.is_file():
print("SKIP: TNC recovery helpers (stacks/tncs/ not shipped — Lite: modem/BayCom-based only)")
return
spec = importlib.util.spec_from_file_location("tnc_serial_recovery", module_path)
assert spec and spec.loader
mod = importlib.util.module_from_spec(spec)
spec.loader.exec_module(mod)
assert mod.has_banner(b"TheFirmware Version 2.7")
assert mod.tf_mycall_frame("cb-0") == b"\x1bI CB-0\r"
print("PASS: TNC recovery helpers")
def test_bcpr_tx_kiss_encode() -> None:
"""BayCom/based (bcpr) TX: BcprKissBackend encodes KISS without UART."""
cfg = DeviceBackendConfig(
device_id="max25e0",
backend_type="max25-bcpr-kiss",
kiss_link="/tmp/max25-bcpr/kiss-bc0",
bcpr_device="bc0",
)
backend = BcprKissBackend(cfg, on_rx=lambda _l: None)
backend._fd = 99
backend._kiss_active = True
written: list[bytes] = []
with patch("os.write", side_effect=lambda _fd, data: written.append(data) or len(data)):
with patch("termios.tcdrain"):
ok, display = backend.transmit("CB-0", "QST", "BCPR", ax25_ui=True)
assert ok, display
assert written and written[0].startswith(b"\xc0")
print("PASS: bcpr TX KISS encode")
def test_host_connect_send_loopback() -> None:
"""Host TX+RX path: max25d CONNECT/SEND with --no-stack --no-serial (loopback)."""
if not DAEMON.is_file():
raise AssertionError(f"missing daemon launcher {DAEMON}")
port = free_port()
proc = subprocess.Popen(
[str(DAEMON), "--no-stack", "--no-serial", "-c", str(INI), "--tcp-port", str(port)],
stdout=subprocess.DEVNULL,
stderr=subprocess.PIPE,
text=True,
)
if not wait_for_port(port, proc):
err = proc.stderr.read() if proc.stderr else ""
proc.terminate()
proc.wait(timeout=3)
raise AssertionError(f"max25d not listening: {err.strip()}")
try:
sock = socket.create_connection(("127.0.0.1", port), timeout=3)
reader = LineReader(sock)
assert reader.read() == "OK"
assert reader.read().startswith("STATUS ")
sock.sendall(b"SET CALLERID CB-0\n")
assert reader.read() == "OK"
sock.sendall(b"CONNECT\n")
assert reader.read() == "EVENT connected"
assert reader.read() == "OK"
sock.sendall(b"SEND TXRX\n")
rx = reader.read()
assert rx.startswith("RX "), rx
assert reader.read() == "OK"
sock.close()
print("PASS: host CONNECT/SEND loopback (TX+RX echo)")
finally:
proc.terminate()
proc.wait(timeout=5)
def main() -> int:
tests = [
test_tnc_tx_kiss_encode,
test_tnc_rx_kiss_decode,
test_tnc_recovery_helpers,
test_bcpr_tx_kiss_encode,
test_host_connect_send_loopback,
]
for fn in tests:
fn()
print("OK: tx/rx offline (TNC + bcpr host paths)")
return 0
if __name__ == "__main__":
try:
raise SystemExit(main())
except Exception as exc: # noqa: BLE001 — L0 gate: one clear FAIL
print(f"FAIL: {exc}", file=sys.stderr)
raise SystemExit(1) from exc
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