added retry logic on socket connection

examples/ring.py

@@ -189,11 +189,15 @@ def main():
                     
                     #shutdown connection
                     skt.shutdown(socket.SHUT_RDWR)
-                    skt.close()                    
+                    skt.close()
+                    skt = None                    
                     time.sleep(database_update_time_gap)
                     
-                    # reopen socket
-                    skt = pakbus.open_socket(host, port, timeout)
+                    # reopen socket                
+                    while skt == None:
+                        skt = pakbus.open_socket(host, port, timeout)
+                        if skt == None:
+                            self.log.error("Failed to reopen socket, retry")
                     
             except socket.error as msg:
                 logging.error("Socket died with: {}".format(msg))