int xbeeapp_send_atcmd(const char *atcmd_str,
void *param, unsigned param_len, int foreground,
int (*func)(void *frame, unsigned len, void *arg),
int xbeeapp_send_atcmd(const char *atcmd_str,
void *param, unsigned param_len, int foreground,
int (*func)(void *frame, unsigned len, void *arg),