chore: massive repo reorganization

mux/python/.gitignore

@@ -0,0 +1 @@
+.venv/

mux/python/README.md

@@ -0,0 +1,26 @@
+# DongLoRa Mux (Python)
+
+USB multiplexer daemon — lets multiple applications share one DongLoRa
+dongle simultaneously.
+
+## What It Does
+
+- Owns the USB serial connection exclusively
+- Exposes a Unix domain socket (and optional TCP) speaking the same
+  COBS-framed protocol
+- RxPacket frames broadcast to all connected clients
+- StartRx/StopRx reference-counted across clients
+- SetConfig locked once set (single client can change freely)
+
+## Running
+
+```sh
+just run                            # start the mux daemon
+just verbose                        # start with verbose logging
+just run --tcp 5741 --port /dev/ttyACM0   # with options
+```
+
+## Depends On
+
+- [clients/python](../../clients/python/) — the `donglora` client library
+  (protocol encoding, device discovery)

mux/python/donglora_mux/__init__.py

@@ -0,0 +1,517 @@
+"""DongLoRa USB Multiplexer — share one dongle with multiple applications.
+
+Owns the USB serial connection and exposes a Unix domain socket that speaks
+the same COBS-framed protocol.  Clients connect via the socket (or just call
+dl.connect() which auto-detects the mux) and get:
+
+  • Solicited responses routed back to the commanding client
+  • RxPacket frames broadcast to ALL connected clients
+  • StartRx/StopRx reference-counted so the radio stays in RX as long as
+    anyone wants it
+  • SetConfig locked once set — subsequent clients must use the same config
+    (a single client can change config freely, like a scanner)
+
+Usage:
+    donglora-mux [--port /dev/ttyACM0] [--socket /tmp/donglora-mux.sock] [--tcp 5741]
+"""
+
+from __future__ import annotations
+
+import argparse
+import asyncio
+import logging
+import os
+import signal
+from pathlib import Path
+
+import serial
+from cobs import cobs
+
+import donglora as dl
+
+log = logging.getLogger("donglora-mux")
+
+# ── Protocol constants ───────────────────────────────────────────
+
+TAG_RXPACKET = 2
+TAG_OK = 4
+TAG_ERROR = 5
+CMD_TAG_SET_CONFIG = 2
+CMD_TAG_START_RX = 3
+CMD_TAG_STOP_RX = 4
+
+ERROR_INVALID_CONFIG = 0
+
+
+def default_socket_path() -> str:
+    """Resolve the mux socket path in priority order."""
+    env = os.environ.get("DONGLORA_MUX")
+    if env:
+        return env
+    xdg = os.environ.get("XDG_RUNTIME_DIR")
+    if xdg:
+        return os.path.join(xdg, "donglora", "mux.sock")
+    return "/tmp/donglora-mux.sock"
+
+
+# ── Per-client state ─────────────────────────────────────────────
+
+class Client:
+    """Tracks one connected client."""
+
+    _next_id = 0
+
+    def __init__(self, reader: asyncio.StreamReader, writer: asyncio.StreamWriter):
+        self.id = Client._next_id
+        Client._next_id += 1
+        self.reader = reader
+        self.writer = writer
+        self.rx_interested = False  # has this client called StartRx?
+        self.send_queue: asyncio.Queue[bytes] = asyncio.Queue(maxsize=256)
+        self._sender_task: asyncio.Task | None = None
+
+    @property
+    def label(self) -> str:
+        return f"client-{self.id}"
+
+    def start_sender(self) -> None:
+        self._sender_task = asyncio.create_task(self._sender(), name=f"{self.label}-sender")
+
+    async def _sender(self) -> None:
+        """Drain send_queue → socket.  Runs until cancelled or write fails."""
+        try:
+            while True:
+                frame = await self.send_queue.get()
+                self.writer.write(frame)
+                await self.writer.drain()
+        except (ConnectionError, asyncio.CancelledError):
+            pass
+
+    async def enqueue(self, cobs_frame: bytes) -> None:
+        """Enqueue a COBS frame for sending.  Drops oldest RxPacket on overflow."""
+        try:
+            self.send_queue.put_nowait(cobs_frame)
+        except asyncio.QueueFull:
+            # Drop oldest to make room (best-effort for slow clients)
+            try:
+                self.send_queue.get_nowait()
+            except asyncio.QueueEmpty:
+                pass
+            try:
+                self.send_queue.put_nowait(cobs_frame)
+            except asyncio.QueueFull:
+                pass
+
+    def close(self) -> None:
+        if self._sender_task:
+            self._sender_task.cancel()
+        try:
+            self.writer.close()
+        except Exception:
+            pass
+
+
+# ── Mux daemon ───────────────────────────────────────────────────
+
+class MuxDaemon:
+    def __init__(self, serial_port: str, socket_path: str, tcp_addr: tuple[str, int] | None = None):
+        self.serial_port = serial_port
+        self.socket_path = socket_path
+        self.tcp_addr = tcp_addr
+        self.ser: serial.Serial | None = None
+        self.clients: dict[int, Client] = {}
+        self.cmd_queue: asyncio.Queue[tuple[int, bytes]] = asyncio.Queue()
+        self.pending_response: asyncio.Future[bytes] | None = None
+        self.locked_config: bytes | None = None  # raw RadioConfig bytes (13 bytes) once set
+        self._shutdown = asyncio.Event()
+
+    # ── Serial I/O (blocking, run in threads) ────────────────────
+
+    def _serial_read_frame(self) -> bytes | None:
+        """Blocking read of one COBS frame from dongle."""
+        assert self.ser is not None
+        return dl.read_frame(self.ser)
+
+    def _serial_write(self, data: bytes) -> None:
+        """Blocking write to dongle."""
+        assert self.ser is not None
+        self.ser.write(data)
+        self.ser.flush()
+
+    # ── Dongle reader task ───────────────────────────────────────
+
+    async def dongle_reader(self) -> None:
+        """Read frames from the dongle, dispatch solicited vs broadcast."""
+        consecutive_errors = 0
+        max_retries = 3
+        while not self._shutdown.is_set():
+            try:
+                raw = await asyncio.to_thread(self._serial_read_frame)
+            except (serial.SerialException, OSError) as e:
+                consecutive_errors += 1
+                if consecutive_errors >= max_retries:
+                    log.error("Dongle read error (giving up after %d consecutive failures): %s", consecutive_errors, e)
+                    self._handle_dongle_disconnect()
+                    return
+                log.warning("Dongle read glitch (%d/%d): %s", consecutive_errors, max_retries, e)
+                await asyncio.sleep(0.1)
+                continue
+
+            consecutive_errors = 0
+
+            if raw is None:
+                continue
+
+            tag = raw[0]
+            cobs_frame = dl.cobs_encode(raw)
+
+            if tag == TAG_RXPACKET:
+                # Broadcast to all clients
+                for client in list(self.clients.values()):
+                    await client.enqueue(cobs_frame)
+            else:
+                # Solicited response — resolve the pending future
+                if self.pending_response and not self.pending_response.done():
+                    self.pending_response.set_result(raw)
+                else:
+                    log.warning("Unsolicited non-RxPacket response (tag %d) — dropped", tag)
+
+    # ── Dongle writer task ───────────────────────────────────────
+
+    async def dongle_writer(self) -> None:
+        """Pull commands from queue, send one at a time, route responses."""
+        loop = asyncio.get_running_loop()
+
+        while not self._shutdown.is_set():
+            client_id, raw_cmd = await self.cmd_queue.get()
+
+            # Check for StartRx/StopRx ref-counting intercept
+            intercepted = await self._maybe_intercept(client_id, raw_cmd)
+            if intercepted is not None:
+                # Send the synthetic response to the client
+                if client_id in self.clients:
+                    await self.clients[client_id].enqueue(dl.cobs_encode(intercepted))
+                continue
+
+            # Create future for the solicited response
+            self.pending_response = loop.create_future()
+
+            # Send COBS-encoded command to dongle
+            cobs_frame = dl.cobs_encode(raw_cmd)
+            try:
+                await asyncio.to_thread(self._serial_write, cobs_frame)
+            except (serial.SerialException, OSError) as e:
+                log.error("Dongle write error: %s", e)
+                self.pending_response.set_result(bytes([5, 1]))  # Error(RadioBusy)
+                self._handle_dongle_disconnect()
+                return
+
+            # Wait for dongle_reader to resolve the future
+            try:
+                response = await asyncio.wait_for(self.pending_response, timeout=10.0)
+            except asyncio.TimeoutError:
+                log.error("Dongle response timeout")
+                response = bytes([5, 1])  # Error(RadioBusy)
+            finally:
+                self.pending_response = None
+
+            # Track state on successful forward
+            cmd_tag = raw_cmd[0]
+            resp_tag = response[0] if response else 0xFF
+            if cmd_tag == CMD_TAG_SET_CONFIG and resp_tag == TAG_OK:
+                self.locked_config = raw_cmd[1:]
+                log.info("Radio config locked: %s", self.locked_config.hex())
+            elif cmd_tag == CMD_TAG_START_RX and resp_tag == TAG_OK:
+                if client_id in self.clients:
+                    self.clients[client_id].rx_interested = True
+            elif cmd_tag == CMD_TAG_STOP_RX and resp_tag == TAG_OK:
+                if client_id in self.clients:
+                    self.clients[client_id].rx_interested = False
+
+            # Route response to commanding client (if still connected)
+            if client_id in self.clients:
+                await self.clients[client_id].enqueue(dl.cobs_encode(response))
+
+    # ── StartRx / StopRx reference counting ──────────────────────
+
+    def _rx_interest_count(self) -> int:
+        return sum(1 for c in self.clients.values() if c.rx_interested)
+
+    async def _maybe_intercept(self, client_id: int, raw_cmd: bytes) -> bytes | None:
+        """Intercept SetConfig/StartRx/StopRx for smart multiplexing.
+
+        Returns a synthetic response if intercepted, None to forward normally.
+        """
+        if not raw_cmd:
+            return None
+        cmd_tag = raw_cmd[0]
+        client = self.clients.get(client_id)
+
+        if cmd_tag == CMD_TAG_SET_CONFIG:
+            config_bytes = raw_cmd[1:]  # 13-byte RadioConfig
+            if len(self.clients) <= 1:
+                # Single client — allow free config changes (scanner mode)
+                # Forward to dongle, update locked_config on success
+                return None
+            if self.locked_config is None:
+                # First SetConfig with multiple clients — forward and lock
+                return None
+            if config_bytes == self.locked_config:
+                # Same config — reply Ok without hitting the dongle
+                log.debug("%s: SetConfig matches locked config — Ok",
+                          client.label if client else f"id-{client_id}")
+                return bytes([TAG_OK])
+            # Different config — reject
+            log.warning("%s: SetConfig rejected (conflicts with locked config)",
+                        client.label if client else f"id-{client_id}")
+            return bytes([TAG_ERROR, ERROR_INVALID_CONFIG])
+
+        if cmd_tag == CMD_TAG_START_RX:
+            if client and client.rx_interested:
+                # Already interested — no-op, reply Ok
+                return bytes([TAG_OK])
+            if self._rx_interest_count() > 0:
+                # Someone else is already receiving — just mark this client, reply Ok
+                if client:
+                    client.rx_interested = True
+                return bytes([TAG_OK])
+            # First interested client — forward to dongle (return None)
+            return None
+
+        if cmd_tag == CMD_TAG_STOP_RX:
+            if client and not client.rx_interested:
+                # Wasn't interested — no-op, reply Ok
+                return bytes([TAG_OK])
+            if client:
+                client.rx_interested = False
+            if self._rx_interest_count() > 0:
+                # Others still interested — don't stop, reply Ok
+                return bytes([TAG_OK])
+            # Last interested client — forward to dongle (return None)
+            return None
+
+        return None
+
+    # ── Client handling ──────────────────────────────────────────
+
+    async def client_handler(self, reader: asyncio.StreamReader, writer: asyncio.StreamWriter) -> None:
+        client = Client(reader, writer)
+        self.clients[client.id] = client
+        client.start_sender()
+        log.info("%s connected (%d total)", client.label, len(self.clients))
+
+        try:
+            buf = b""
+            while True:
+                data = await reader.read(4096)
+                if not data:
+                    break
+                buf += data
+                # Extract complete COBS frames (delimited by 0x00)
+                while b"\x00" in buf:
+                    idx = buf.index(b"\x00")
+                    encoded = buf[:idx]
+                    buf = buf[idx + 1:]
+                    if not encoded:
+                        continue
+                    try:
+                        raw_cmd = cobs.decode(encoded)
+                    except cobs.DecodeError:
+                        log.warning("%s: bad COBS frame — skipped", client.label)
+                        continue
+                    await self.cmd_queue.put((client.id, raw_cmd))
+        except (ConnectionError, asyncio.CancelledError):
+            pass
+        finally:
+            await self._remove_client(client)
+
+    async def _remove_client(self, client: Client) -> None:
+        """Clean up after a disconnected client."""
+        was_interested = client.rx_interested
+        client.close()
+        self.clients.pop(client.id, None)
+        log.info("%s disconnected (%d remain)", client.label, len(self.clients))
+
+        # If this client had RX interest and was the last one, stop RX
+        if was_interested and self._rx_interest_count() == 0:
+            log.info("Last RX-interested client gone — sending StopRx")
+            await self.cmd_queue.put((-1, bytes([CMD_TAG_STOP_RX])))
+
+        # Reset locked config when all clients are gone
+        if not self.clients:
+            if self.locked_config is not None:
+                log.info("All clients gone — config lock released")
+                self.locked_config = None
+
+    # ── Dongle disconnect ────────────────────────────────────────
+
+    _dongle_lost: asyncio.Event
+
+    def _handle_dongle_disconnect(self) -> None:
+        log.error("Dongle disconnected — will reconnect")
+        if self.pending_response and not self.pending_response.done():
+            self.pending_response.set_result(bytes([5, 1]))  # Error(RadioBusy)
+        if self.ser:
+            try:
+                self.ser.close()
+            except Exception:
+                pass
+            self.ser = None
+        self._dongle_lost.set()
+
+    # ── Dongle connection ──────────────────────────────────────────
+
+    def _open_dongle(self) -> bool:
+        """Open and ping the dongle. Returns True on success."""
+        try:
+            self.ser = serial.Serial(self.serial_port, timeout=2.0, exclusive=True)
+            self.ser.reset_input_buffer()
+            self._serial_write(dl.cobs_encode(dl.encode_command("Ping")))
+            pong = self._serial_read_frame()
+            if not pong or pong[0] != 0:
+                log.warning("Dongle did not respond to Ping")
+                self.ser.close()
+                self.ser = None
+                return False
+            log.info("Dongle responded to Ping")
+            return True
+        except (serial.SerialException, OSError) as e:
+            log.warning("Could not open dongle: %s", e)
+            self.ser = None
+            return False
+
+    # ── Main entry ───────────────────────────────────────────────
+
+    async def run(self) -> None:
+        self._dongle_lost = asyncio.Event()
+
+        # Prepare socket path
+        sock_path = Path(self.socket_path)
+        sock_path.parent.mkdir(parents=True, exist_ok=True)
+        if sock_path.exists():
+            sock_path.unlink()
+
+        # Start servers (these stay up for the lifetime of the daemon)
+        server = await asyncio.start_unix_server(self.client_handler, path=str(sock_path))
+        log.info("Unix socket listening on %s", self.socket_path)
+
+        tcp_server = None
+        if self.tcp_addr:
+            tcp_server = await asyncio.start_server(
+                self.client_handler, self.tcp_addr[0], self.tcp_addr[1],
+            )
+            log.info("TCP listening on %s:%d", *self.tcp_addr)
+
+        # Connect/reconnect loop — servers stay up, dongle comes and goes
+        try:
+            while not self._shutdown.is_set():
+                # Connect to dongle (retry until it appears)
+                log.info("Opening dongle on %s", self.serial_port)
+                while not self._shutdown.is_set():
+                    if await asyncio.to_thread(self._open_dongle):
+                        break
+                    await asyncio.sleep(2)
+
+                if self._shutdown.is_set():
+                    break
+
+                # Run dongle reader/writer until dongle is lost
+                self._dongle_lost.clear()
+                reader_task = asyncio.create_task(self.dongle_reader(), name="dongle-reader")
+                writer_task = asyncio.create_task(self.dongle_writer(), name="dongle-writer")
+
+                # Wait for dongle loss or shutdown
+                shutdown_task = asyncio.create_task(self._shutdown.wait())
+                lost_task = asyncio.create_task(self._dongle_lost.wait())
+                await asyncio.wait(
+                    [shutdown_task, lost_task],
+                    return_when=asyncio.FIRST_COMPLETED,
+                )
+                shutdown_task.cancel()
+                lost_task.cancel()
+
+                # Tear down dongle tasks
+                reader_task.cancel()
+                writer_task.cancel()
+                try:
+                    await asyncio.gather(reader_task, writer_task, return_exceptions=True)
+                except asyncio.CancelledError:
+                    pass
+
+                # Drain any pending commands with errors
+                while not self.cmd_queue.empty():
+                    try:
+                        self.cmd_queue.get_nowait()
+                    except asyncio.QueueEmpty:
+                        break
+
+                if not self._shutdown.is_set():
+                    log.info("Reconnecting in 2 seconds...")
+                    await asyncio.sleep(2)
+        finally:
+            # Cleanup
+            log.info("Shutting down...")
+            for client in list(self.clients.values()):
+                client.close()
+            server.close()
+            await server.wait_closed()
+            if tcp_server:
+                tcp_server.close()
+                await tcp_server.wait_closed()
+            if self.ser:
+                self.ser.close()
+            if sock_path.exists():
+                sock_path.unlink()
+            log.info("Stopped.")
+
+
+# ── CLI ──────────────────────────────────────────────────────────
+
+def main() -> None:
+    parser = argparse.ArgumentParser(description="DongLoRa USB Multiplexer")
+    parser.add_argument("--port", "-p", default=None, help="Serial port (auto-detect if omitted)")
+    parser.add_argument("--socket", "-s", default=None, help="Unix socket path")
+    parser.add_argument("--tcp", "-t", default="0.0.0.0:5741", metavar="[HOST:]PORT",
+                        help="TCP listen address (default: 0.0.0.0:5741, 'none' to disable)")
+    parser.add_argument("--verbose", "-v", action="store_true")
+    args = parser.parse_args()
+
+    logging.basicConfig(
+        level=logging.DEBUG if args.verbose else logging.INFO,
+        format="%(asctime)s %(name)s %(levelname)s %(message)s",
+        datefmt="%H:%M:%S",
+    )
+
+    port = args.port or dl.find_port()
+    if not port:
+        log.info("Waiting for DongLoRa device...")
+        port = dl.wait_for_device()
+
+    socket_path = args.socket or default_socket_path()
+
+    tcp_addr = None
+    if args.tcp and args.tcp.lower() != "none":
+        if ":" in args.tcp:
+            host, _, p = args.tcp.rpartition(":")
+            tcp_addr = (host, int(p))
+        else:
+            tcp_addr = ("0.0.0.0", int(args.tcp))
+
+    daemon = MuxDaemon(port, socket_path, tcp_addr=tcp_addr)
+
+    loop = asyncio.new_event_loop()
+
+    def _signal_handler() -> None:
+        daemon._shutdown.set()
+
+    for sig in (signal.SIGINT, signal.SIGTERM):
+        loop.add_signal_handler(sig, _signal_handler)
+
+    try:
+        loop.run_until_complete(daemon.run())
+    finally:
+        loop.close()
+
+
+if __name__ == "__main__":
+    main()

mux/python/donglora_mux/__main__.py

@@ -0,0 +1,3 @@
+from donglora_mux import main
+
+main()

mux/python/justfile

@@ -0,0 +1,15 @@
+set shell := ["bash", "-c"]
+
+default: run
+
+[private]
+_ensure_tools:
+    @mise trust --yes . 2>/dev/null; mise install --quiet
+
+# Run the mux daemon
+run *args: _ensure_tools
+    @uv run -m donglora_mux {{args}}
+
+# Run with verbose logging
+verbose *args: _ensure_tools
+    @uv run -m donglora_mux --verbose {{args}}

mux/python/mise.toml

@@ -0,0 +1,4 @@
+[tools]
+python = "3.14"
+uv = "latest"
+just = "latest"

mux/python/pyproject.toml

@@ -0,0 +1,22 @@
+[project]
+name = "donglora-mux"
+version = "0.1.0"
+description = "DongLoRa USB Multiplexer — share one dongle with multiple applications"
+license = "MIT"
+requires-python = ">=3.10"
+authors = [{ name = "Stephen Waits" }]
+dependencies = [
+    "donglora",
+    "cobs",
+    "pyserial",
+]
+
+[project.scripts]
+donglora-mux = "donglora_mux:main"
+
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[tool.uv.sources]
+donglora = { path = "../../clients/python", editable = true }

mux/python/uv.lock

@@ -0,0 +1,64 @@
+version = 1
+revision = 3
+requires-python = ">=3.10"
+
+[[package]]
+name = "cobs"
+version = "1.2.2"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/34/ef/ea149311227a4fc3160cc885fce06da7c7d76782a308ef070b8065c69953/cobs-1.2.2.tar.gz", hash = "sha256:dbdd5e32111d72786f83d0c269215dcd6ac629b1ac1962c6878221f3b2ca98da", size = 14582, upload-time = "2025-07-20T01:08:35.434Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/e5/e0/9574590639a624a9a84c89a569f36343523a306fff2ffddc9468a2b9b05d/cobs-1.2.2-cp312-cp312-win32.whl", hash = "sha256:3afe0cec5d91164f84dcf35b471949aa36285664d21ee984350e39d485707d11", size = 26400, upload-time = "2025-07-20T01:08:30.288Z" },
+    { url = "https://files.pythonhosted.org/packages/d3/4f/5418d9decdc4cf27a814fc189bc4fa44d216d37b871d633654f37ed331f8/cobs-1.2.2-cp312-cp312-win_amd64.whl", hash = "sha256:4da6048f6e16cbd6c8ec5e95e8520e226248ffb8d31e9d6fc5e0888b3b65c54b", size = 27776, upload-time = "2025-07-20T01:08:31.377Z" },
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