echo_delay
uint8_t id, send_delay, echo_delay;
echo_delay = slave->t_echo_delay;
slave->t_echo_delay = echo_delay;
echo_delay(master);
echo_delay(master);
echo_delay(master);
echo_delay(master);
echo_delay(master);
unsigned char echo_delay;
patch->inst.echo_delay = ext[0];