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#!/usr/bin/env python3
"""
Minimal ARDOPC TCP mock for HyBBX plugin host-TCP local tests.
Control port N, data port N+1. CRC-16 poly 0x8810 (ARDOP host family).
"""
from __future__ import annotations
import socket
import struct
import sys
import threading
import time
INT_POLY = 0x8810
def crc16(data: bytes) -> int:
reg = 0xFFFF
for byte in data:
mask = 0x80
for _ in range(8):
bit = byte & mask
mask >>= 1
if reg & 0x8000:
if bit:
reg = (1 + (reg << 1)) & 0xFFFF
else:
reg = (reg << 1) & 0xFFFF
reg ^= INT_POLY
else:
if bit:
reg = (1 + (reg << 1)) & 0xFFFF
else:
reg = (reg << 1) & 0xFFFF
return reg
def frame_cmd(text: str) -> bytes:
body = (text + "\r").encode("ascii")
c = crc16(body)
return body + struct.pack(">H", c)
def parse_frames(buf: bytearray) -> list[bytes]:
out: list[bytes] = []
while True:
if b"\r" not in buf:
break
cr = buf.index(0x0D)
need = cr + 1 + 2
if len(buf) < need:
break
frame = bytes(buf[:need])
del buf[:need]
if crc16(frame[:-2]) == struct.unpack(">H", frame[-2:])[0]:
out.append(frame[:-2])
return out
def serve_ctrl(port: int, log: list[str]) -> None:
srv = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
srv.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
srv.bind(("127.0.0.1", port))
srv.listen(1)
srv.settimeout(8.0)
try:
conn, _ = srv.accept()
except socket.timeout:
srv.close()
return
conn.settimeout(2.0)
conn.sendall(frame_cmd("VERSION crdopc_1.0.0"))
buf = bytearray()
try:
while True:
try:
chunk = conn.recv(4096)
except TimeoutError:
break
if not chunk:
break
buf.extend(chunk)
for frame in parse_frames(buf):
cmd = frame.decode("ascii", errors="replace").strip()
log.append(f"ctrl<= {cmd}")
if cmd.startswith("INITIALIZE"):
conn.sendall(frame_cmd("RDY"))
elif cmd == "RDY":
pass
else:
conn.sendall(frame_cmd("RDY"))
finally:
conn.close()
srv.close()
def serve_data(port: int, log: list[str]) -> None:
srv = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
srv.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
srv.bind(("127.0.0.1", port))
srv.listen(1)
srv.settimeout(8.0)
try:
conn, _ = srv.accept()
except socket.timeout:
srv.close()
return
conn.settimeout(1.0)
try:
while True:
try:
chunk = conn.recv(4096)
except socket.timeout:
continue
if not chunk:
break
log.append(f"data<= {len(chunk)} bytes")
finally:
conn.close()
srv.close()
def main() -> int:
port = int(sys.argv[1]) if len(sys.argv) > 1 else 18515
log: list[str] = []
t1 = threading.Thread(target=serve_ctrl, args=(port, log), daemon=True)
t2 = threading.Thread(target=serve_data, args=(port + 1, log), daemon=True)
t1.start()
t2.start()
time.sleep(6)
for line in log:
print(line)
return 0 if any("INITIALIZE" in x for x in log) else 1
if __name__ == "__main__":
sys.exit(main())
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