nsapi_error_t EasyCellularConnection::connect()
{
nsapi_error_t err = check_connect();
if (err) {
return err;
}
#if USE_APN_LOOKUP
if (!_credentials_set) {
_target_state = CellularConnectionFSM::STATE_SIM_PIN;
err = _cellularConnectionFSM->continue_to_state(_target_state);
if (err == NSAPI_ERROR_OK) {
int sim_wait = _cellularSemaphore.wait(60 * 1000); // reserve 60 seconds to access to SIM
if (sim_wait != 1) {
tr_error("NO SIM ACCESS");
err = NSAPI_ERROR_NO_CONNECTION;
} else {
char imsi[MAX_IMSI_LENGTH + 1];
wait(1); // need to wait to access SIM in some modems
err = _cellularConnectionFSM->get_sim()->get_imsi(imsi);
if (err == NSAPI_ERROR_OK) {
const char *apn_config = apnconfig(imsi);
if (apn_config) {
const char* apn = _APN_GET(apn_config);
const char* uname = _APN_GET(apn_config);
const char* pwd = _APN_GET(apn_config);
tr_info("Looked up APN %s", apn);
err = _cellularConnectionFSM->get_network()->set_credentials(apn, uname, pwd);
}
}
}
}
if (err) {
tr_error("APN lookup failed");
return err;
}
}
#endif // USE_APN_LOOKUP
_target_state = CellularConnectionFSM::STATE_CONNECTED;
err = _cellularConnectionFSM->continue_to_state(_target_state);
if (err == NSAPI_ERROR_OK) {
int ret_wait = _cellularSemaphore.wait(10 * 60 * 1000); // cellular network searching may take several minutes
if (ret_wait != 1) {
tr_info("No cellular connection");
err = NSAPI_ERROR_NO_CONNECTION;
}
}
return err;
}
nsapi_error_t PPPCellularInterface::connect()
{
nsapi_error_t retcode;
bool success;
bool did_init = false;
const char *apn_config = NULL;
if (dev_info.ppp_connection_up) {
return NSAPI_ERROR_IS_CONNECTED;
}
do {
retry_init:
/* setup AT parser */
setup_at_parser();
if (!initialized) {
/* If we have hangup (eg DCD) detection, we don't want it active
* as long as we are using ATCmdParser.
* As soon as we get into data mode, we will turn it back on. */
enable_hup(false);
if (!power_up()) {
return NSAPI_ERROR_DEVICE_ERROR;
}
retcode = initialize_sim_card();
if (retcode != NSAPI_ERROR_OK) {
return retcode;
}
success = nwk_registration(PACKET_SWITCHED) //perform network registration
&& get_CCID(_at)//get integrated circuit ID of the SIM
&& get_IMSI(_at)//get international mobile subscriber information
&& get_IMEI(_at)//get international mobile equipment identifier
&& get_MEID(_at)//its same as IMEI
&& set_CMGF(_at)//set message format for SMS
&& set_CNMI(_at);//set new SMS indication
if (!success) {
return NSAPI_ERROR_NO_CONNECTION;
}
#if MBED_CONF_PPP_CELL_IFACE_APN_LOOKUP
if (!apn_config) {
apn_config = apnconfig(dev_info.imsi);
}
#endif
/* Check if user want skip SIM pin checking on boot up */
if (set_sim_pin_check_request) {
retcode = do_sim_pin_check(_at, _pin);
if (retcode != NSAPI_ERROR_OK) {
return retcode;
}
/* set this request to false, as it is unnecessary to repeat in case of retry */
set_sim_pin_check_request = false;
}
/* check if the user requested a sim pin change */
if (change_pin) {
retcode = do_change_sim_pin(_at, _pin, _new_pin);
if (retcode != NSAPI_ERROR_OK) {
return retcode;
}
/* set this request to false, as it is unnecessary to repeat in case of retry */
change_pin = false;
}
#if MBED_CONF_PPP_CELL_IFACE_APN_LOOKUP
if (apn_config) {
_apn = _APN_GET(apn_config);
_uname = _APN_GET(apn_config);
_pwd = _APN_GET(apn_config);
tr_info("Looked up APN %s.", _apn);
}
#endif
//sets up APN and IP protocol for external PDP context
retcode = setup_context_and_credentials();
if (retcode != NSAPI_ERROR_OK) {
return retcode;
}
if (!success) {
shutdown_at_parser();
return NSAPI_ERROR_NO_CONNECTION;
}
initialized = true;
did_init = true;
} else {
/* If we were already initialized, we expect to receive NO_CARRIER response
* from the modem as we were kicked out of Data mode */
_at->recv("NO CARRIER");
success = _at->send("AT") && _at->recv("OK");
}
/* Attempt to enter data mode */
success = set_atd(_at); //enter into Data mode with the modem
if (!success) {
power_down();
initialized = false;
/* if we were previously initialized , i.e., not in this particular attempt,
* we want to re-initialize */
if (!did_init) {
goto retry_init;
}
/* shutdown AT parser before notifying application of the failure */
shutdown_at_parser();
return NSAPI_ERROR_NO_CONNECTION;
}
/* This is the success case.
* Save RAM, discard AT Parser as we have entered Data mode. */
shutdown_at_parser();
/* We now want hangup (e.g., DCD) detection if available */
enable_hup(true);
/* Initialize PPP
* mbed_ppp_init() is a blocking call, it will block until
* connected, or timeout after 30 seconds*/
retcode = nsapi_ppp_connect(_fh, _connection_status_cb, _uname, _pwd, _stack);
if (retcode == NSAPI_ERROR_OK) {
dev_info.ppp_connection_up = true;
}
}while(!dev_info.ppp_connection_up && apn_config && *apn_config);
return retcode;
}