Added heartbeat return on peer.py test

src/dynalab_core/protocols/endpoint.py

@@ -177,6 +177,7 @@ class ConnectorEndpoint:
                         first_received = True
                         if received.return_timestamp is not None:
                             last_recieved = received.return_timestamp
+                            log.debug("Received heartbeat")
 
                 if not first_received:
                     if ctr > round(