int bridge_tx(unsigned char *data, int len); /* used to transmit data to remote port */
virtual int bridge_rx(unsigned char *data, int len); /* function to be inherited, so data is received */
int bridge_tx(unsigned char *data, int len); /* used to transmit data to remote port */
virtual int bridge_rx(unsigned char *data, int len); /* function to be inherited, so data is received */