Deprecation message

test/minimal_connector.py

@@ -99,6 +99,7 @@ async def run_connector_session() -> None:
     handshake: HandshakeAccepted
 
     peer = writer.get_extra_info("peername")
+    value_task: asyncio.Task[None] | None = None
     print(f"Connected to DynaLab at {peer}")
 
     try:
@@ -129,6 +130,8 @@ async def run_connector_session() -> None:
         elif isinstance(message, HandshakeRejected):
             print(f"Connector handshake rejected: {message.reason}")
             return
+        else:
+            raise ValueError(f"Expected handshake response, received {message.type}")
 
         value_task = asyncio.create_task(_value_sender(writer, connector_hello))
         # Keep the connection alive by returning heartbeat messages.
@@ -137,15 +140,15 @@ async def run_connector_session() -> None:
             print(f"Received {message}")
 
             if isinstance(message, Heartbeat):
-                if message.sequence < 10:
-                    message.return_timestamp = machine_timestamp_ms()
-                    await write_message(writer, message)
+                message.return_timestamp = machine_timestamp_ms()
+                await write_message(writer, message)
 
     except asyncio.CancelledError:
         raise
 
     finally:
-        value_task.cancel()
+        if value_task is not None:
+            value_task.cancel()
         print("Disconnecting")
         writer.close()
         await writer.wait_closed()