command.channels = 0;
ao_radio_cmac_send(&command, sizeof (command));
sent_time = ao_time();
r = ao_radio_cmac_recv(query, sizeof (*query), timeout);
if (r == AO_RADIO_CMAC_OK)
command.channels = 0;
ao_radio_cmac_send(&command, sizeof (command));
sent_time = ao_time();
r = ao_radio_cmac_recv(query, sizeof (*query), timeout);
if (r == AO_RADIO_CMAC_OK)