L2CAP: Enhanced Retransmission Mode

tests/l2cap_test.py

@@ -342,6 +342,39 @@ async def test_mtu():
     assert client_channel.peer_mtu == 345
 
 
+# -----------------------------------------------------------------------------
+@pytest.mark.asyncio
+async def test_enhanced_retransmission_channel():
+    devices = TwoDevices()
+    await devices.setup_connection()
+
+    server_channels = asyncio.Queue[l2cap.ClassicChannel]()
+    server = devices.devices[1].create_l2cap_server(
+        spec=l2cap.ClassicChannelSpec(), handler=server_channels.put_nowait
+    )
+    client_channel = await devices.connections[0].create_l2cap_channel(
+        spec=l2cap.ClassicChannelSpec(
+            server.psm, mode=l2cap.TransmissionMode.ENHANCED_RETRANSMISSION
+        )
+    )
+    server_channel = await server_channels.get()
+    assert isinstance(client_channel.processor, l2cap.EnhancedRetransmissionProcessor)
+    assert isinstance(server_channel.processor, l2cap.EnhancedRetransmissionProcessor)
+
+    sinks = [asyncio.Queue[bytes]() for _ in range(2)]
+    server_channel.sink = sinks[0].put_nowait
+    client_channel.sink = sinks[1].put_nowait
+
+    for _ in range(128):
+        server_channel.write(b'123')
+    for _ in range(128):
+        assert (await sinks[1].get()) == b'123'
+    for _ in range(128):
+        client_channel.write(b'456')
+    for _ in range(128):
+        assert (await sinks[0].get()) == b'456'
+
+
 # -----------------------------------------------------------------------------
 async def run():
     test_helpers()