/* send a string to the modem, processing for \336 (sleep 1 sec) and \335 (break signal)  */
void zsend_break(char *cmd)
/* send a string to the modem, processing for \336 (sleep 1 sec) and \335 (break signal)  */
void zsend_break(char *cmd)
{
    while (*cmd++)
    {
        switch (*cmd)
        {
        case '\336':
             continue;
        case '\335':
             rt_thread_delay(RT_TICK_PER_SECOND);
             continue;
        default:
             zsend_line(*cmd);
             break;
        }
    }
}