added retry logic on socket connection

                    #shutdown connection

                    skt.shutdown(socket.SHUT_RDWR)

                    skt.close()

                    skt = None                    

                    time.sleep(database_update_time_gap)

                    # 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))