added retry logic on socket connection

examples/ring.py

@@ -147,7 +147,12 @@ def main():
                 logging.info('MAKING CONNECTION')
                 
                 # open socket
-                skt = pakbus.open_socket(host, port, timeout)
+                skt = None
+                while skt == None:
+                    skt = pakbus.open_socket(host, port, timeout)
+                    if skt == None:
+                        self.log.error("Failed to open socket, retry")
+                
                     
                 #if (len(pakbus_ids) != len(metric_ids)):
                     #logging.error("'pakbus_ids' and 'metric_ids' need to have the same number of elements")