Fixed error message, was missing a parameter

devices/clients/opcua_connection.py

@@ -76,8 +76,7 @@ class OPCUAConnection(CommClient):
 			self.streams.debug_stream("Connected to %s. Initialising.", self._servername())
 			return True
 		except socket.error as e:
-			#TODO
-			self.streams.error_stream("Could not connect to server %s: %s", self._servername())
+			self.streams.error_stream("Could not connect to server %s: %s", self._servername(), e)
 			raise Exception("") from e