Explicitly disconnect when not being able to send_hello, as technically we may...

Explicitly disconnect when not being able to send_hello, as technically we may not have disconnected.

RCUSCC/RCUSCC/RCUSCC.py

@@ -101,6 +101,7 @@ class OPCUAConnection(Thread):
         except socket.error as e:
             self.streams.error_stream("Could not connect to server %s: %s", self._servername(), e)
 
+            # signal that we're disconnected
             self.fault_func()
             return False
 
@@ -124,6 +125,10 @@ class OPCUAConnection(Thread):
             except Exception as e:
                 self.streams.error_stream("Lost connection to server %s: %s", self._servername(), e)
 
+                # technically, we may not have dropped the connection, but encounter a different error. so explicitly disconnect.
+                self.try_disconnect()
+
+                # signal that we're disconnected
                 self.fault_func()
 
     def stop(self):