Add Phase 0 host-bridge: relay text across Meshtastic, MeshCore, Reticulum

host-bridge/adapters/meshcore_adapter.py

@@ -0,0 +1,83 @@
+"""MeshCore adapter — wraps the official `meshcore` (meshcore_py) async client.
+
+meshcore_py is asyncio-native (MeshCore.create_serial/create_tcp/create_ble,
+event subscription via meshcore.subscribe(EventType.X, coroutine_handler)).
+The rest of this bridge is thread/callback-based (Meshtastic's pubsub,
+Reticulum's RNS transport thread), so this adapter owns a dedicated event
+loop on a background thread and exposes plain synchronous connect()/send()/
+close() methods, matching the shape of the other two adapters.
+"""
+
+import asyncio
+import threading
+from collections.abc import Callable
+
+
+class MeshCoreAdapter:
+    NETWORK = "meshcore"
+
+    def __init__(
+        self,
+        on_message: Callable[[str, str, str], None],
+        port: str | None = None,
+        host: str | None = None,
+        tcp_port: int = 4000,
+        channel_idx: int = 0,
+    ):
+        """port: serial device path. host: TCP hostname/IP (mutually exclusive
+        with port). channel_idx: which MeshCore public channel to bridge —
+        channel 0 is the default public channel on stock firmware.
+        """
+        self._on_message = on_message
+        self._port = port
+        self._host = host
+        self._tcp_port = tcp_port
+        self._channel_idx = channel_idx
+        self._mc = None
+        self._loop: asyncio.AbstractEventLoop | None = None
+        self._thread: threading.Thread | None = None
+
+    def connect(self) -> None:
+        ready = threading.Event()
+        self._thread = threading.Thread(target=self._run_loop, args=(ready,), daemon=True)
+        self._thread.start()
+        ready.wait(timeout=15)
+
+    def _run_loop(self, ready: threading.Event) -> None:
+        self._loop = asyncio.new_event_loop()
+        asyncio.set_event_loop(self._loop)
+        self._loop.run_until_complete(self._connect_async())
+        ready.set()
+        self._loop.run_forever()
+
+    async def _connect_async(self) -> None:
+        from meshcore import EventType, MeshCore
+
+        if self._host:
+            self._mc = await MeshCore.create_tcp(self._host, self._tcp_port)
+        else:
+            self._mc = await MeshCore.create_serial(self._port or "/dev/ttyUSB0")
+
+        self._mc.subscribe(EventType.CHANNEL_MSG_RECV, self._handle_channel_msg)
+
+    async def _handle_channel_msg(self, event) -> None:  # noqa: ANN001
+        data = event.payload
+        if data.get("channel_idx") != self._channel_idx:
+            return
+        text = data.get("text", "")
+        if text:
+            # CHANNEL_MSG_RECV carries no sender identity at the protocol
+            # level (verified against meshcore/reader.py) — MeshCore apps
+            # convey the sender by convention inside the text itself.
+            self._on_message(self.NETWORK, "?", text)
+
+    def send(self, text: str) -> None:
+        if self._mc is None or self._loop is None:
+            raise RuntimeError("MeshCoreAdapter.send() called before connect()")
+        asyncio.run_coroutine_threadsafe(
+            self._mc.commands.send_chan_msg(self._channel_idx, text), self._loop
+        )
+
+    def close(self) -> None:
+        if self._loop is not None:
+            self._loop.call_soon_threadsafe(self._loop.stop)

host-bridge/adapters/meshtastic_adapter.py

@@ -0,0 +1,57 @@
+"""Meshtastic adapter — wraps the official `meshtastic` Python client.
+
+Uses the same pubsub pattern as meshtastic/python's own examples
+(examples/replymessage.py, examples/tcp_pubsub_send_and_receive.py):
+subscribe to the "meshtastic.receive" topic, filter for text packets,
+send via MeshInterface.sendText().
+"""
+
+from collections.abc import Callable
+
+from pubsub import pub
+
+
+class MeshtasticAdapter:
+    NETWORK = "meshtastic"
+
+    def __init__(
+        self,
+        on_message: Callable[[str, str, str], None],
+        port: str | None = None,
+        host: str | None = None,
+    ):
+        """port: serial device path (e.g. /dev/ttyUSB0). host: TCP hostname/IP.
+        Exactly one of port/host should be set; if neither is set, the
+        underlying library auto-detects a serial device.
+        """
+        self._on_message = on_message
+        self._port = port
+        self._host = host
+        self._iface = None
+
+    def connect(self) -> None:
+        import meshtastic.serial_interface
+        import meshtastic.tcp_interface
+
+        pub.subscribe(self._handle_receive, "meshtastic.receive")
+
+        if self._host:
+            self._iface = meshtastic.tcp_interface.TCPInterface(hostname=self._host, timeout=10)
+        else:
+            self._iface = meshtastic.serial_interface.SerialInterface(devPath=self._port, timeout=10)
+
+    def _handle_receive(self, packet: dict, interface) -> None:  # noqa: ANN001
+        text = packet.get("decoded", {}).get("text")
+        if not text:
+            return
+        sender = packet.get("fromId") or str(packet.get("from"))
+        self._on_message(self.NETWORK, sender, text)
+
+    def send(self, text: str) -> None:
+        if self._iface is None:
+            raise RuntimeError("MeshtasticAdapter.send() called before connect()")
+        self._iface.sendText(text)
+
+    def close(self) -> None:
+        if self._iface is not None:
+            self._iface.close()

host-bridge/adapters/reticulum_adapter.py

@@ -0,0 +1,96 @@
+"""Reticulum adapter — wraps RNS + LXMF (the standard host-side Reticulum
+messaging stack; see docs/ARCHITECTURE.md for why archy-messh talks to a
+real RNode-flashed radio via RNS rather than reimplementing Reticulum's
+wire format from scratch).
+
+Reticulum has no built-in broadcast-channel concept the way Meshtastic
+("channel" PSK) or MeshCore ("public channel index") do — LXMF messaging is
+addressed point-to-point between Destinations. To bridge broadcast-style
+text, this adapter tracks a roster of peer LXMF delivery destinations
+learned from their announces (any Reticulum/Sideband/NomadNet/MeshChat user
+who has announced is added), and fans outbound bridge messages out to that
+roster individually. This is the simplest correct v0; a dedicated shared
+GROUP destination (symmetric-key, closer to a real "channel") is a known
+follow-up once Phase 0 proves the roster approach works at all.
+"""
+
+import threading
+from collections.abc import Callable
+
+
+class ReticulumAdapter:
+    NETWORK = "reticulum"
+    ASPECT = "lxmf.delivery"
+
+    def __init__(
+        self,
+        on_message: Callable[[str, str, str], None],
+        storage_path: str,
+        display_name: str = "archy-messh-bridge",
+    ):
+        self._on_message = on_message
+        self._storage_path = storage_path
+        self._display_name = display_name
+        self._router = None
+        self._identity = None
+        self._destination = None
+        self._peers: set[bytes] = set()
+        self._lock = threading.Lock()
+
+        # RNS.Transport.register_announce_handler() requires an object with
+        # an `aspect_filter` attribute — set here so `self` can be registered
+        # directly as the announce handler.
+        self.aspect_filter = self.ASPECT
+
+    def connect(self) -> None:
+        import RNS
+        import LXMF
+
+        RNS.Reticulum()
+        self._router = LXMF.LXMRouter(storagepath=self._storage_path)
+        self._identity = RNS.Identity()
+        self._destination = self._router.register_delivery_identity(
+            self._identity, display_name=self._display_name
+        )
+        self._router.register_delivery_callback(self._handle_delivery)
+        RNS.Transport.register_announce_handler(self)
+        self._router.announce(self._destination.hash)
+
+    def received_announce(self, destination_hash, announced_identity, app_data) -> None:  # noqa: ANN001
+        if self._destination is not None and destination_hash == self._destination.hash:
+            return  # ignore our own announce
+        with self._lock:
+            self._peers.add(destination_hash)
+
+    def _handle_delivery(self, message) -> None:  # noqa: ANN001
+        import RNS
+
+        text = message.content_as_string()
+        sender = RNS.prettyhexrep(message.source_hash)
+        if text:
+            self._on_message(self.NETWORK, sender, text)
+
+    def send(self, text: str) -> None:
+        import RNS
+        import LXMF
+
+        if self._router is None or self._destination is None:
+            raise RuntimeError("ReticulumAdapter.send() called before connect()")
+
+        with self._lock:
+            peer_hashes = list(self._peers)
+
+        for peer_hash in peer_hashes:
+            identity = RNS.Identity.recall(peer_hash)
+            if identity is None:
+                continue  # no path/identity known yet for this peer
+            dest = RNS.Destination(
+                identity, RNS.Destination.OUT, RNS.Destination.SINGLE, "lxmf", "delivery"
+            )
+            lxm = LXMF.LXMessage(
+                dest, self._destination, text, desired_method=LXMF.LXMessage.OPPORTUNISTIC
+            )
+            self._router.handle_outbound(lxm)
+
+    def close(self) -> None:
+        pass  # RNS/LXMF manage their own threads; no explicit teardown needed for a v0 prototype