int at_handshake()
{
int i;
int err = 0;
if (0 != pthread_equal(s_tid_reader, pthread_self())) {
/* cannot be called from reader thread */
return AT_ERROR_INVALID_THREAD;
}
pthread_mutex_lock(&s_commandmutex);
for (i = 0 ; i < HANDSHAKE_RETRY_COUNT ; i++) {
/* some stacks start with verbose off */
err = at_send_command_full_nolock ("ATE0Q0V1", NO_RESULT,
NULL, NULL, HANDSHAKE_TIMEOUT_MSEC, NULL);
if (err == 0) {
break;
}
}
if (err == 0) {
/* pause for a bit to let the input buffer drain any unmatched OK's
(they will appear as extraneous unsolicited responses) */
sleepMsec(HANDSHAKE_TIMEOUT_MSEC);
}
pthread_mutex_unlock(&s_commandmutex);
return err;
}
/**
* Periodically issue an AT command and wait for a response.
* Used to ensure channel has start up and is active.
*/
int at_handshake(void)
{
int i;
int err = 0;
struct atcontext *ac = getAtContext();
if (0 != pthread_equal(ac->tid_reader, pthread_self()))
/* Cannot be called from reader thread. */
return AT_ERROR_INVALID_THREAD;
pthread_mutex_lock(&ac->commandmutex);
for (i = 0 ; i < HANDSHAKE_RETRY_COUNT ; i++) {
/* Some stacks start with verbose off. */
err = at_send_command_full_nolock ("ATE0V1", NO_RESULT,
NULL, NULL, HANDSHAKE_TIMEOUT_MSEC, NULL);
if (err == 0)
break;
}
if (err == 0) {
/* Pause for a bit to let the input buffer drain any unmatched OK's
(they will appear as extraneous unsolicited responses). */
ALOGD("%s() pausing %d ms to drain unmatched OK's...",
__func__, HANDSHAKE_TIMEOUT_MSEC);
sleepMsec(HANDSHAKE_TIMEOUT_MSEC);
}
pthread_mutex_unlock(&ac->commandmutex);
return err;
}
