fix: accept PKI direct messages without channel

plugin/tests/contract/test_gateway_contract.py

@@ -36,6 +36,7 @@ so the gate can never silently skip.
 
 import inspect
 import os
+from types import SimpleNamespace
 
 import pytest
 
@@ -228,3 +229,40 @@ def test_inbound_event_construction_is_valid(registered_entry):
     )
     assert event.source.platform.value == "meshtastic"
     assert event.text == "hello over LoRa"
+
+
+def test_pki_direct_message_without_channel_reaches_gateway(
+    registered_entry, monkeypatch
+):
+    """PKI DMs omit channel and must bypass the secondary-channel filter."""
+    adapter = _make_adapter(registered_entry)
+    adapter._loop = SimpleNamespace(is_running=lambda: True)
+    captured = {}
+
+    async def handle_message(event):
+        captured["event"] = event
+
+    def submit(coro, loop):
+        captured["loop"] = loop
+        with pytest.raises(StopIteration):
+            coro.send(None)
+
+    adapter.handle_message = handle_message
+    monkeypatch.setattr(plugin_adapter.asyncio, "run_coroutine_threadsafe", submit)
+
+    interface = SimpleNamespace(myInfo=SimpleNamespace(my_node_num=0x1BA1BC60))
+    adapter._on_meshtastic_receive(
+        {
+            "from": 0x1BA1496C,
+            "to": 0x1BA1BC60,
+            "toId": "!1ba1bc60",
+            "pkiEncrypted": True,
+            "decoded": {"text": "hello over PKI"},
+            "id": 42,
+        },
+        interface,
+    )
+
+    assert captured["loop"] is adapter._loop
+    assert captured["event"].text == "hello over PKI"
+    assert captured["event"].source.chat_id == "!1ba1496c"