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mbed-os/connectivity/cellular/source/framework/AT/AT_CellularContext.cpp

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/*
* Copyright (c) 2018, Arm Limited and affiliates.
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdio.h>
#include "AT_CellularContext.h"
#include "AT_CellularNetwork.h"
#include "AT_CellularStack.h"
#include "AT_ControlPlane_netif.h"
#include "AT_CellularDevice.h"
#include "CellularLog.h"
#if (DEVICE_SERIAL && DEVICE_INTERRUPTIN) || defined(DOXYGEN_ONLY)
#include "drivers/BufferedSerial.h"
#endif // #if DEVICE_SERIAL
#include "rtos/ThisThread.h"
#define NETWORK_TIMEOUT 30min
#define DEVICE_TIMEOUT 5min
// Timeout to wait for URC indicating ciot optimization support from network
#define CP_OPT_NW_REPLY_TIMEOUT 3s
#if NSAPI_PPP_AVAILABLE
#define AT_SYNC_TIMEOUT 1s
#include "nsapi_ppp.h"
#endif
#if MBED_CONF_CELLULAR_USE_APN_LOOKUP
#include "CellularInformation.h"
#include "APN_db.h"
#endif //MBED_CONF_CELLULAR_USE_APN_LOOKUP
using namespace mbed_cellular_util;
using namespace mbed;
using namespace rtos;
using namespace std::chrono_literals;
AT_CellularContext::AT_CellularContext(ATHandler &at, CellularDevice *device, const char *apn, bool cp_req, bool nonip_req) :
_current_op(OP_INVALID), _dcd_pin(NC), _active_high(false), _cp_req(cp_req), _is_connected(false), _at(at)
{
tr_info("New CellularContext %s (%p)", apn ? apn : "", this);
_nonip_req = nonip_req;
_apn = apn;
_device = device;
}
AT_CellularContext::~AT_CellularContext()
{
tr_info("Delete CellularContext with apn: [%s] (%p)", _apn ? _apn : "", this);
_is_blocking = true;
(void)disconnect();
if (_nw) {
_device->close_network();
}
if (_cp_netif) {
delete _cp_netif;
}
}
#if (DEVICE_SERIAL && DEVICE_INTERRUPTIN) || defined(DOXYGEN_ONLY)
nsapi_error_t AT_CellularContext::configure_hup(PinName dcd_pin, bool active_high)
{
_dcd_pin = dcd_pin;
_active_high = active_high;
enable_hup(false);
return NSAPI_ERROR_OK;
}
#endif // #if DEVICE_SERIAL
void AT_CellularContext::enable_hup(bool enable)
{
if (_dcd_pin != NC) {
#if (DEVICE_SERIAL && DEVICE_INTERRUPTIN) || defined(DOXYGEN_ONLY)
static_cast<BufferedSerial *>(_at.get_file_handle())->set_data_carrier_detect(enable ? _dcd_pin : NC, _active_high);
#endif // #if DEVICE_SERIAL
}
}
AT_CellularDevice *AT_CellularContext::get_device() const
{
return static_cast<AT_CellularDevice *>(CellularContext::get_device());
}
void AT_CellularContext::do_connect_with_retry()
{
CellularContext::do_connect_with_retry();
}
nsapi_error_t AT_CellularContext::connect()
{
tr_info("CellularContext connect");
if (_is_connected) {
return NSAPI_ERROR_IS_CONNECTED;
}
call_network_cb(NSAPI_STATUS_CONNECTING);
nsapi_error_t err = _device->attach_to_network();
_cb_data.error = check_operation(err, OP_CONNECT);
_retry_count = 0;
if (_is_blocking) {
if (_cb_data.error == NSAPI_ERROR_OK || _cb_data.error == NSAPI_ERROR_ALREADY) {
do_connect_with_retry();
}
} else {
if (_cb_data.error == NSAPI_ERROR_ALREADY) {
// device is already attached, to be async we must use queue to connect and give proper callbacks
int id = _device->get_queue()->call(this, &AT_CellularContext::do_connect_with_retry);
if (id == 0) {
return NSAPI_ERROR_NO_MEMORY;
}
return NSAPI_ERROR_OK;
}
}
if (_cb_data.error == NSAPI_ERROR_ALREADY) {
return NSAPI_ERROR_OK;
}
return _cb_data.error;
}
nsapi_error_t AT_CellularContext::set_device_ready()
{
nsapi_error_t err = _device->set_device_ready();
return check_operation(err, OP_DEVICE_READY);
}
nsapi_error_t AT_CellularContext::set_sim_ready()
{
nsapi_error_t err = _device->set_sim_ready();
return check_operation(err, OP_SIM_READY);
}
nsapi_error_t AT_CellularContext::register_to_network()
{
nsapi_error_t err = _device->register_to_network();
return check_operation(err, OP_REGISTER);
}
nsapi_error_t AT_CellularContext::attach_to_network()
{
nsapi_error_t err = _device->attach_to_network();
return check_operation(err, OP_ATTACH);
}
nsapi_error_t AT_CellularContext::check_operation(nsapi_error_t err, ContextOperation op)
{
_current_op = op;
if (err == NSAPI_ERROR_IN_PROGRESS || err == NSAPI_ERROR_OK) {
if (_is_blocking) {
auto d = std::chrono::duration<uint32_t, std::milli>(get_timeout_for_operation(op));
int sema_acq = _semaphore.try_acquire_for(d); // cellular network searching may take several minutes
if (!sema_acq) {
tr_warning("No cellular connection");
return NSAPI_ERROR_TIMEOUT;
}
return _cb_data.error;// callback might have been completed with an error, must return that error here
}
}
return err;
}
nsapi_connection_status_t AT_CellularContext::get_connection_status() const
{
return _connect_status;
}
uint32_t AT_CellularContext::get_timeout_for_operation(ContextOperation op) const
{
std::chrono::duration<uint32_t, std::milli> timeout = NETWORK_TIMEOUT; // default timeout is 30 minutes as registration and attach may take time
if (op == OP_SIM_READY || op == OP_DEVICE_READY) {
timeout = DEVICE_TIMEOUT; // use 5 minutes for device ready and sim
}
return timeout.count();
}
bool AT_CellularContext::is_connected()
{
return _is_connected;
}
NetworkStack *AT_CellularContext::get_stack()
{
#if NSAPI_PPP_AVAILABLE
// use lwIP/PPP if modem does not have IP stack
if (!_stack) {
_stack = nsapi_ppp_get_stack();
}
#endif
return _stack;
}
nsapi_error_t AT_CellularContext::get_ip_address(SocketAddress *address)
{
if (!address) {
return NSAPI_ERROR_PARAMETER;
}
#if NSAPI_PPP_AVAILABLE
address->set_ip_address(nsapi_ppp_get_ip_addr(_at.get_file_handle()));
return NSAPI_ERROR_OK;
#else
if (!_stack) {
_stack = get_stack();
}
if (_stack) {
_stack->get_ip_address(address);
return NSAPI_ERROR_OK;
}
return NSAPI_ERROR_NO_CONNECTION;
#endif
}
char *AT_CellularContext::get_interface_name(char *interface_name)
{
if (_cid < 0) {
return NULL;
}
MBED_ASSERT(interface_name);
sprintf(interface_name, "ce%d", _cid);
return interface_name;
}
void AT_CellularContext::attach(Callback<void(nsapi_event_t, intptr_t)> status_cb)
{
_status_cb = status_cb;
}
nsapi_error_t AT_CellularContext::set_blocking(bool blocking)
{
nsapi_error_t err = NSAPI_ERROR_OK;
tr_info("CellularContext set blocking %d", blocking);
#if NSAPI_PPP_AVAILABLE
err = nsapi_ppp_set_blocking(blocking);
#endif
_is_blocking = blocking;
return err;
}
void AT_CellularContext::set_plmn(const char *plmn)
{
tr_info("CellularContext plmn %s", (plmn ? plmn : "NULL"));
_device->set_plmn(plmn);
}
void AT_CellularContext::set_sim_pin(const char *sim_pin)
{
_device->set_sim_pin(sim_pin);
}
nsapi_error_t AT_CellularContext::connect(const char *sim_pin, const char *apn, const char *uname,
const char *pwd)
{
set_sim_pin(sim_pin);
set_credentials(apn, uname, pwd);
return connect();
}
void AT_CellularContext::set_credentials(const char *apn, const char *uname, const char *pwd)
{
_apn = apn;
_uname = uname;
_pwd = pwd;
}
// PDP Context handling
void AT_CellularContext::delete_current_context()
{
if (_cid <= 0) {
return;
}
tr_info("Delete context %d", _cid);
_at.clear_error();
_at.at_cmd_discard("+CGDCONT", "=", "%d", _cid);
if (_at.get_last_error() == NSAPI_ERROR_OK) {
set_cid(-1);
_new_context_set = false;
}
// there is nothing we can do if deleting of context fails. No point reporting an error (for example disconnect).
_at.clear_error();
}
nsapi_error_t AT_CellularContext::do_user_authentication()
{
// if user has defined user name and password we need to call CGAUTH before activating or modifying context
if (_pwd && _uname) {
if (!get_device()->get_property(AT_CellularDevice::PROPERTY_AT_CGAUTH)) {
return NSAPI_ERROR_UNSUPPORTED;
}
const bool stored_debug_state = _at.get_debug();
_at.set_debug(false);
_at.at_cmd_discard("+CGAUTH", "=", "%d%d%s%s", _cid, _authentication_type, _uname, _pwd);
_at.set_debug(stored_debug_state);
if (_at.get_last_error() != NSAPI_ERROR_OK) {
return NSAPI_ERROR_AUTH_FAILURE;
}
}
return NSAPI_ERROR_OK;
}
AT_CellularDevice::CellularProperty AT_CellularContext::pdp_type_t_to_cellular_property(pdp_type_t pdp_type)
{
AT_CellularDevice::CellularProperty prop = AT_CellularDevice::PROPERTY_IPV4_PDP_TYPE;
if (pdp_type == IPV6_PDP_TYPE) {
prop = AT_CellularDevice::PROPERTY_IPV6_PDP_TYPE;
} else if (pdp_type == IPV4V6_PDP_TYPE) {
prop = AT_CellularDevice::PROPERTY_IPV4V6_PDP_TYPE;
} else if (pdp_type == NON_IP_PDP_TYPE) {
prop = AT_CellularDevice::PROPERTY_NON_IP_PDP_TYPE;
}
return prop;
}
bool AT_CellularContext::get_context()
{
_at.cmd_start_stop("+CGDCONT", "?");
_at.resp_start("+CGDCONT:");
set_cid(-1);
int cid_max = 0; // needed when creating new context
char apn[MAX_ACCESSPOINT_NAME_LENGTH];
int apn_len = 0;
while (_at.info_resp()) {
int cid = _at.read_int();
if (cid > cid_max) {
cid_max = cid;
}
char pdp_type_from_context[10];
int pdp_type_len = _at.read_string(pdp_type_from_context, sizeof(pdp_type_from_context));
if (pdp_type_len > 0) {
apn_len = _at.read_string(apn, sizeof(apn));
if (apn_len >= 0) {
if (_apn && (strcmp(apn, _apn) != 0)) {
tr_debug("CID %d APN \"%s\"", cid, apn);
continue;
}
// APN matched -> Check PDP type
pdp_type_t pdp_type = string_to_pdp_type(pdp_type_from_context);
tr_debug("CID %d APN \"%s\" pdp_type %u", cid, apn, pdp_type);
// Accept exact matching PDP context type or dual PDP context for modems that support both IPv4 and IPv6 stacks
if (get_device()->get_property(pdp_type_t_to_cellular_property(pdp_type)) ||
((pdp_type == IPV4V6_PDP_TYPE && (get_device()->get_property(AT_CellularDevice::PROPERTY_IPV4_PDP_TYPE) &&
get_device()->get_property(AT_CellularDevice::PROPERTY_IPV6_PDP_TYPE))) && !_nonip_req)) {
_pdp_type = pdp_type;
set_cid(cid);
}
}
}
}
_at.resp_stop();
if (_cid == -1) { // no suitable context was found so create a new one
if (!set_new_context(cid_max + 1)) {
return false;
}
}
// save the apn
if (apn_len > 0 && !_apn) {
memcpy(_found_apn, apn, apn_len + 1);
}
tr_info("Found PDP context %d", _cid);
return true;
}
const char *AT_CellularContext::get_nonip_context_type_str()
{
return "Non-IP";
}
bool AT_CellularContext::set_new_context(int cid)
{
char pdp_type_str[8 + 1] = {0};
pdp_type_t pdp_type = IPV4_PDP_TYPE;
if (_nonip_req && _cp_in_use && get_device()->get_property(AT_CellularDevice::PROPERTY_NON_IP_PDP_TYPE)) {
strncpy(pdp_type_str, get_nonip_context_type_str(), sizeof(pdp_type_str));
pdp_type = NON_IP_PDP_TYPE;
} else if (get_device()->get_property(AT_CellularDevice::PROPERTY_IPV4V6_PDP_TYPE) ||
(get_device()->get_property(AT_CellularDevice::PROPERTY_IPV4_PDP_TYPE) &&
get_device()->get_property(AT_CellularDevice::PROPERTY_IPV6_PDP_TYPE))) {
strncpy(pdp_type_str, "IPV4V6", sizeof(pdp_type_str));
pdp_type = IPV4V6_PDP_TYPE;
} else if (get_device()->get_property(AT_CellularDevice::PROPERTY_IPV6_PDP_TYPE)) {
strncpy(pdp_type_str, "IPV6", sizeof(pdp_type_str));
pdp_type = IPV6_PDP_TYPE;
} else if (get_device()->get_property(AT_CellularDevice::PROPERTY_IPV4_PDP_TYPE)) {
strncpy(pdp_type_str, "IP", sizeof(pdp_type_str));
pdp_type = IPV4_PDP_TYPE;
} else {
return false;
}
//apn: "If the value is null or omitted, then the subscription value will be requested."
bool success = (_at.at_cmd_discard("+CGDCONT", "=", "%d%s%s", cid, pdp_type_str, _apn) == NSAPI_ERROR_OK);
if (success) {
_pdp_type = pdp_type;
set_cid(cid);
_new_context_set = true;
tr_info("New PDP context %d, type %d", _cid, pdp_type);
}
return success;
}
nsapi_error_t AT_CellularContext::do_activate_context()
{
if (_nonip_req && _cp_in_use) {
return activate_non_ip_context();
}
// In IP case but also when Non-IP is requested and
// control plane optimization is not established -> activate ip context
_nonip_req = false;
return activate_ip_context();
}
nsapi_error_t AT_CellularContext::activate_ip_context()
{
nsapi_error_t ret = find_and_activate_context();
#if !NSAPI_PPP_AVAILABLE
if (ret == NSAPI_ERROR_OK) {
pdpContextList_t params_list;
if (get_pdpcontext_params(params_list) == NSAPI_ERROR_OK) {
pdpcontext_params_t *pdp = params_list.get_head();
while (pdp) {
SocketAddress addr;
if (addr.set_ip_address(pdp->dns_secondary_addr)) {
nsapi_addr_t taddr = addr.get_addr();
for (int i = 0; i < ((taddr.version == NSAPI_IPv6) ? NSAPI_IPv6_BYTES : NSAPI_IPv4_BYTES); i++) {
if (taddr.bytes[i] != 0) { // check the address is not all zero
tr_info("DNS secondary %s", pdp->dns_secondary_addr);
char ifn[5]; // "ce" + two digit _cid + zero
add_dns_server(addr, get_interface_name(ifn));
break;
}
}
}
if (addr.set_ip_address(pdp->dns_primary_addr)) {
nsapi_addr_t taddr = addr.get_addr();
for (int i = 0; i < ((taddr.version == NSAPI_IPv6) ? NSAPI_IPv6_BYTES : NSAPI_IPv4_BYTES); i++) {
if (taddr.bytes[i] != 0) { // check the address is not all zero
tr_info("DNS primary %s", pdp->dns_primary_addr);
char ifn[5]; // "ce" + two digit _cid + zero
add_dns_server(addr, get_interface_name(ifn));
break;
}
}
}
pdp = pdp->next;
}
}
}
#endif
return ret;
}
nsapi_error_t AT_CellularContext::activate_non_ip_context()
{
return find_and_activate_context();
}
void AT_CellularContext::activate_context()
{
tr_info("Activate PDP context %d", _cid);
_at.at_cmd_discard("+CGACT", "=1,", "%d", _cid);
if (_at.get_last_error() == NSAPI_ERROR_OK) {
_is_context_activated = true;
}
}
nsapi_error_t AT_CellularContext::find_and_activate_context()
{
_at.lock();
nsapi_error_t err = NSAPI_ERROR_OK;
// try to find or create context of suitable type
if (get_context()) {
#if NSAPI_PPP_AVAILABLE
_at.unlock();
// in PPP we don't activate any context but leave it to PPP stack
return err;
#else
// try to authenticate user before activating or modifying context
err = do_user_authentication();
#endif // NSAPI_PPP_AVAILABLE
} else {
err = NSAPI_ERROR_NO_CONNECTION;
}
if (err != NSAPI_ERROR_OK) {
tr_error("Failed to activate network context! (%d)", err);
} else if (!(_nonip_req && _cp_in_use) && !get_stack()) {
// do check for stack to validate that we have support for stack
tr_error("No cellular stack!");
err = NSAPI_ERROR_UNSUPPORTED;
}
_is_context_active = false;
_is_context_activated = false;
if (err == NSAPI_ERROR_OK) {
_is_context_active = _nw->is_active_context(NULL, _cid);
if (!_is_context_active) {
activate_context();
}
err = (_at.get_last_error() == NSAPI_ERROR_OK) ? NSAPI_ERROR_OK : NSAPI_ERROR_NO_CONNECTION;
}
// If new PDP context was created and failed to activate, delete it
if (err != NSAPI_ERROR_OK && _new_context_set) {
delete_current_context();
} else if (err == NSAPI_ERROR_OK) {
_is_context_active = true;
_is_context_activated = true;
}
_at.unlock();
return err;
}
void AT_CellularContext::do_connect()
{
if (!_is_context_active) {
_cb_data.error = do_activate_context();
} else {
_cb_data.error = NSAPI_ERROR_OK;
}
#if !NSAPI_PPP_AVAILABLE
// in PPP mode we did not activate any context, just searched the correct _cid
if (_status_cb) {
_status_cb((nsapi_event_t)CellularActivatePDPContext, (intptr_t)&_cb_data);
}
#endif // !NSAPI_PPP_AVAILABLE
if (_cb_data.error != NSAPI_ERROR_OK) {
_is_connected = false;
return;
}
#if NSAPI_PPP_AVAILABLE
if (_cb_data.error == NSAPI_ERROR_OK) {
_at.lock();
_cb_data.error = open_data_channel();
_at.unlock();
if (_cb_data.error != NSAPI_ERROR_OK) {
_is_connected = false;
}
}
#else
_is_connected = true;
#endif
}
#if NSAPI_PPP_AVAILABLE
nsapi_error_t AT_CellularContext::open_data_channel()
{
// If Non-IP in use fail
if (_pdp_type == NON_IP_PDP_TYPE) {
tr_error("Attempt of PPP connect over NON-IP: failed to CONNECT");
return NSAPI_ERROR_PARAMETER;
}
tr_info("CellularContext PPP connect");
if (get_device()->get_property(AT_CellularDevice::PROPERTY_AT_CGDATA)) {
_at.cmd_start_stop("+CGDATA", "=\"PPP\",", "%d", _cid);
} else {
MBED_ASSERT(_cid >= 0 && _cid <= 99);
_at.cmd_start("ATD*99***");
_at.use_delimiter(false);
_at.write_int(_cid);
_at.write_string("#", false);
_at.use_delimiter(true);
_at.cmd_stop();
}
_at.resp_start("CONNECT", true);
if (_at.get_last_error()) {
tr_error("Failed to CONNECT");
return _at.get_last_error();
}
_at.set_is_filehandle_usable(false);
enable_hup(true);
/* Initialize PPP
* If blocking: mbed_ppp_init() is a blocking call, it will block until
connected, or timeout after 30 seconds*/
nsapi_error_t err = nsapi_ppp_connect(_at.get_file_handle(), callback(this, &AT_CellularContext::ppp_status_cb), _uname, _pwd, (nsapi_ip_stack_t)_pdp_type);
if (err) {
tr_error("nsapi_ppp_connect failed");
ppp_disconnected();
}
return err;
}
void AT_CellularContext::ppp_status_cb(nsapi_event_t ev, intptr_t ptr)
{
tr_debug("ppp_status_cb: event %d, ptr %d", ev, ptr);
if (ev == NSAPI_EVENT_CONNECTION_STATUS_CHANGE && ptr == NSAPI_STATUS_GLOBAL_UP) {
_is_connected = true;
} else {
// catch all NSAPI_STATUS_DISCONNECTED events but send to device only when we did not ask for disconnect.
if (ev == NSAPI_EVENT_CONNECTION_STATUS_CHANGE && ptr == NSAPI_STATUS_DISCONNECTED) {
if (_is_connected) { // set to false in disconnect() before calling nsapi_ppp_disconnect()
_is_connected = false;
ppp_disconnected();
_device->cellular_callback(ev, ptr, this);
}
return; // return here so if we were not in connected state we don't send NSAPI_STATUS_DISCONNECTED event
}
_is_connected = false;
}
// call device's callback, it will broadcast this to here (cellular_callback)
_device->cellular_callback(ev, ptr, this);
}
void AT_CellularContext::ppp_disconnected()
{
enable_hup(false);
// after ppp disconnect if we wan't to use same at handler we need to set filehandle again to athandler so it
// will set the correct sigio and nonblocking
_at.lock();
_at.set_is_filehandle_usable(true);
if (!_at.sync(AT_SYNC_TIMEOUT)) { // consume extra characters after ppp disconnect, also it may take a while until modem listens AT commands
tr_error("AT sync failed after PPP Disconnect");
}
_at.unlock();
}
#endif //#if NSAPI_PPP_AVAILABLE
void AT_CellularContext::do_disconnect()
{
if (!_nw || !_is_connected) {
if (_new_context_set) {
delete_current_context();
}
set_cid(-1);
_cb_data.error = NSAPI_ERROR_NO_CONNECTION;
}
// set false here so callbacks know that we are not connected and so should not send DISCONNECTED
_is_connected = false;
#if NSAPI_PPP_AVAILABLE
nsapi_error_t err = nsapi_ppp_disconnect(_at.get_file_handle());
if (err != NSAPI_ERROR_OK) {
tr_error("CellularContext disconnect failed!");
// continue even in failure due to ppp disconnect in any case releases filehandle
}
ppp_disconnected();
#endif // NSAPI_PPP_AVAILABLE
_at.lock();
// deactivate a context only if we have activated
if (_is_context_activated) {
if (_nonip_req && _cp_in_use) {
deactivate_non_ip_context();
} else {
deactivate_ip_context();
}
}
// don't call multiple times disconnect if we already got that event from network urc or ppp
if (_connect_status != NSAPI_STATUS_DISCONNECTED) {
_device->cellular_callback(NSAPI_EVENT_CONNECTION_STATUS_CHANGE, NSAPI_STATUS_DISCONNECTED, this);
}
_is_context_active = false;
_connect_status = NSAPI_STATUS_DISCONNECTED;
if (_new_context_set) {
delete_current_context();
}
set_cid(-1);
_cb_data.error = _at.unlock_return_error();
}
nsapi_error_t AT_CellularContext::disconnect()
{
tr_info("CellularContext disconnect()");
if (_is_blocking) {
do_disconnect();
return _cb_data.error;
} else {
int event_id = _device->get_queue()->call(this, &AT_CellularContext::do_disconnect);
if (event_id == 0) {
return NSAPI_ERROR_NO_MEMORY;
}
return NSAPI_ERROR_OK;
}
}
void AT_CellularContext::deactivate_ip_context()
{
check_and_deactivate_context();
}
void AT_CellularContext::deactivate_non_ip_context()
{
check_and_deactivate_context();
}
void AT_CellularContext::deactivate_context()
{
_at.at_cmd_discard("+CGACT", "=0,", "%d", _cid);
}
void AT_CellularContext::check_and_deactivate_context()
{
// CGACT and CGATT commands might take up to 3 minutes to respond.
_at.set_at_timeout(3min);
int active_contexts_count = 0;
_is_context_active = _nw->is_active_context(&active_contexts_count, _cid);
CellularNetwork::RadioAccessTechnology rat = CellularNetwork::RAT_GSM;
// always return NSAPI_ERROR_OK
CellularNetwork::registration_params_t reg_params;
_nw->get_registration_params(reg_params);
rat = reg_params._act;
// 3GPP TS 27.007:
// For EPS, if an attempt is made to disconnect the last PDN connection, then the MT responds with ERROR
if (_is_context_active && (rat < CellularNetwork::RAT_E_UTRAN || rat == CellularNetwork::RAT_NB1 || active_contexts_count > 1)) {
_at.clear_error();
deactivate_context();
}
if (_new_context_set) {
delete_current_context();
}
_at.restore_at_timeout();
}
nsapi_error_t AT_CellularContext::get_apn_backoff_timer(int &backoff_timer)
{
// If apn is set
if (_apn) {
_at.lock();
_at.cmd_start_stop("+CABTRDP", "=", "%s", _apn);
_at.resp_start("+CABTRDP:");
if (_at.info_resp()) {
_at.skip_param();
backoff_timer = _at.read_int();
}
_at.resp_stop();
return _at.unlock_return_error();
}
return NSAPI_ERROR_PARAMETER;
}
nsapi_error_t AT_CellularContext::get_rate_control(
CellularContext::RateControlExceptionReports &reports,
CellularContext::RateControlUplinkTimeUnit &timeUnit, int &uplinkRate)
{
_at.lock();
_at.cmd_start_stop("+CGAPNRC", "=", "%d", _cid);
_at.resp_start("+CGAPNRC:");
_at.read_int();
if (_at.get_last_error() == NSAPI_ERROR_OK) {
bool comma_found = true;
int next_element = _at.read_int();
if (next_element >= 0) {
reports = (RateControlExceptionReports)next_element;
next_element = _at.read_int();
} else {
comma_found = false;
}
if (comma_found && next_element >= 0) {
timeUnit = (RateControlUplinkTimeUnit)next_element;
next_element = _at.read_int();
} else {
comma_found = false;
}
if (comma_found && next_element >= 0) {
uplinkRate = next_element;
}
if (_at.get_last_error() == NSAPI_ERROR_OK) {
tr_debug("CGAPNRC: reports %d, time %d, rate %d", reports, timeUnit, uplinkRate);
}
}
_at.resp_stop();
return _at.unlock_return_error();
}
nsapi_error_t AT_CellularContext::get_pdpcontext_params(pdpContextList_t &params_list)
{
const int ipv6_subnet_size = 128;
char *ipv6_and_subnetmask = new char[ipv6_subnet_size];
_at.lock();
_at.cmd_start_stop("+CGCONTRDP", "=", "%d", _cid);
_at.resp_start("+CGCONTRDP:");
pdpcontext_params_t *params = NULL;
while (_at.info_resp()) { // response can be zero or many +CGDCONT lines
params = params_list.add_new();
params->cid = _at.read_int();
params->bearer_id = _at.read_int();
_at.read_string(params->apn, sizeof(params->apn));
// rest are optional params
ipv6_and_subnetmask[0] = '\0';
_at.read_string(ipv6_and_subnetmask, ipv6_subnet_size);
separate_ip_addresses(ipv6_and_subnetmask, params->local_addr, sizeof(params->local_addr), params->local_subnet_mask, sizeof(params->local_subnet_mask));
ipv6_and_subnetmask[0] = '\0';
_at.read_string(ipv6_and_subnetmask, ipv6_subnet_size);
separate_ip_addresses(ipv6_and_subnetmask, params->gateway_addr, sizeof(params->gateway_addr), NULL, 0);
ipv6_and_subnetmask[0] = '\0';
_at.read_string(ipv6_and_subnetmask, ipv6_subnet_size);
separate_ip_addresses(ipv6_and_subnetmask, params->dns_primary_addr, sizeof(params->dns_primary_addr), NULL, 0);
ipv6_and_subnetmask[0] = '\0';
_at.read_string(ipv6_and_subnetmask, ipv6_subnet_size);
separate_ip_addresses(ipv6_and_subnetmask, params->dns_secondary_addr, sizeof(params->dns_secondary_addr), NULL, 0);
ipv6_and_subnetmask[0] = '\0';
_at.read_string(ipv6_and_subnetmask, ipv6_subnet_size);
separate_ip_addresses(ipv6_and_subnetmask, params->p_cscf_prim_addr, sizeof(params->p_cscf_prim_addr), NULL, 0);
ipv6_and_subnetmask[0] = '\0';
_at.read_string(ipv6_and_subnetmask, ipv6_subnet_size);
separate_ip_addresses(ipv6_and_subnetmask, params->p_cscf_sec_addr, sizeof(params->p_cscf_sec_addr), NULL, 0);
params->im_signalling_flag = _at.read_int();
params->lipa_indication = _at.read_int();
params->ipv4_mtu = _at.read_int();
params->wlan_offload = _at.read_int();
params->local_addr_ind = _at.read_int();
params->non_ip_mtu = _at.read_int();
params->serving_plmn_rate_control_value = _at.read_int();
}
_at.resp_stop();
delete [] ipv6_and_subnetmask;
return _at.unlock_return_error();
}
// Called by CellularDevice for network and cellular device changes
void AT_CellularContext::cellular_callback(nsapi_event_t ev, intptr_t ptr)
{
if (ev >= NSAPI_EVENT_CELLULAR_STATUS_BASE && ev <= NSAPI_EVENT_CELLULAR_STATUS_END) {
cell_callback_data_t *data = (cell_callback_data_t *)ptr;
cellular_connection_status_t st = (cellular_connection_status_t)ev;
_cb_data.error = data->error;
_cb_data.final_try = data->final_try;
#if MBED_CONF_CELLULAR_USE_APN_LOOKUP
if (st == CellularSIMStatusChanged && data->status_data == CellularDevice::SimStateReady &&
_cb_data.error == NSAPI_ERROR_OK) {
if (!_apn) {
char imsi[MAX_IMSI_LENGTH + 1];
ThisThread::sleep_for(1000); // need to wait to access SIM in some modems
_cb_data.error = _device->open_information()->get_imsi(imsi, sizeof(imsi));
if (_cb_data.error == 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);
set_credentials(apn, uname, pwd);
}
} else {
tr_error("APN lookup failed");
if (_is_blocking) {
// operation failed, release semaphore
if (_current_op != OP_INVALID) {
_semaphore.release();
}
}
}
_device->close_information();
}
}
#endif // MBED_CONF_CELLULAR_USE_APN_LOOKUP
if (!_nw && st == CellularDeviceReady && _cb_data.error == NSAPI_ERROR_OK) {
_nw = _device->open_network();
}
#if MBED_CONF_CELLULAR_CONTROL_PLANE_OPT
if (_cp_req && !_cp_in_use && (_cb_data.error == NSAPI_ERROR_OK) &&
(st == CellularSIMStatusChanged && data->status_data == CellularDevice::SimStateReady)) {
if (setup_control_plane_opt() != NSAPI_ERROR_OK) {
tr_error("Control plane SETUP failed!");
} else {
tr_info("Control plane SETUP success!");
}
}
#endif
if (_is_blocking) {
if ((data->final_try) || (_cb_data.error != NSAPI_ERROR_OK)) {
// operation failed, release semaphore
if (_current_op != OP_INVALID) {
_current_op = OP_INVALID;
_semaphore.release();
}
} else {
if ((st == CellularDeviceReady && _current_op == OP_DEVICE_READY) ||
(st == CellularSIMStatusChanged && _current_op == OP_SIM_READY &&
data->status_data == CellularDevice::SimStateReady)) {
// target reached, release semaphore
_current_op = OP_INVALID;
_semaphore.release();
} else if (st == CellularRegistrationStatusChanged && (data->status_data == CellularNetwork::RegisteredHomeNetwork ||
data->status_data == CellularNetwork::RegisteredRoaming || data->status_data == CellularNetwork::AlreadyRegistered) && _current_op == OP_REGISTER) {
// target reached, release semaphore
_current_op = OP_INVALID;
_semaphore.release();
} else if (st == CellularAttachNetwork && (_current_op == OP_ATTACH || _current_op == OP_CONNECT) &&
data->status_data == CellularNetwork::Attached) {
// target reached, release semaphore
_current_op = OP_INVALID;
_semaphore.release();
}
}
} else {
// non blocking
if (st == CellularAttachNetwork && _current_op == OP_CONNECT && _cb_data.error == NSAPI_ERROR_OK &&
data->status_data == CellularNetwork::Attached) {
_current_op = OP_INVALID;
// forward all Cellular specific events to application
if (_status_cb) {
_status_cb(ev, ptr);
}
_retry_count = 0;
do_connect_with_retry();
return;
}
}
// forward all Cellular specific events to application
if (_status_cb) {
_status_cb(ev, ptr);
}
} else {
#if NSAPI_PPP_AVAILABLE
if (_is_blocking) {
if (ev == NSAPI_EVENT_CONNECTION_STATUS_CHANGE && ptr == NSAPI_STATUS_GLOBAL_UP) {
SocketAddress addr;
get_ip_address(&addr);
tr_info("CellularContext IP %s", addr.get_ip_address());
_cb_data.error = NSAPI_ERROR_OK;
} else if (ev == NSAPI_EVENT_CONNECTION_STATUS_CHANGE && ptr == NSAPI_STATUS_DISCONNECTED) {
tr_info("cellular_callback: PPP mode and NSAPI_STATUS_DISCONNECTED");
_cb_data.error = NSAPI_ERROR_NO_CONNECTION;
set_cid(-1);
_is_connected = false;
ppp_disconnected();
}
}
#else
if (ev == NSAPI_EVENT_CONNECTION_STATUS_CHANGE && ptr == NSAPI_STATUS_DISCONNECTED) {
tr_info("cb: CellularContext disconnected");
set_cid(-1);
_is_connected = false;
}
#endif // NSAPI_PPP_AVAILABLE
// forward status change events to application, call_network_cb will make sure that only changed event are forwarded
call_network_cb((nsapi_connection_status_t)ptr);
}
}
ControlPlane_netif *AT_CellularContext::get_cp_netif()
{
if (!_cp_netif) {
_cp_netif = new AT_ControlPlane_netif(_at, _cid, *get_device());
}
return _cp_netif;
}
nsapi_error_t AT_CellularContext::setup_control_plane_opt()
{
// check if control plane optimization already set
mbed::CellularNetwork::CIoT_Supported_Opt supported_network_opt;
if (_nw->get_ciot_network_optimization_config(supported_network_opt)) {
return NSAPI_ERROR_DEVICE_ERROR;
}
if (supported_network_opt == mbed::CellularNetwork::CIOT_OPT_CONTROL_PLANE ||
supported_network_opt == mbed::CellularNetwork::CIOT_OPT_BOTH) {
_cp_in_use = true;
return NSAPI_ERROR_OK;
}
// ciot optimization not set by app so need to set it now
nsapi_error_t ciot_opt_ret;
ciot_opt_ret = _nw->set_ciot_optimization_config(mbed::CellularNetwork::CIOT_OPT_CONTROL_PLANE,
mbed::CellularNetwork::PREFERRED_UE_OPT_CONTROL_PLANE,
callback(this, &AT_CellularContext::ciot_opt_cb));
if (ciot_opt_ret == NSAPI_ERROR_OK) {
// assume network supports CIoT optimizations until ciot_opt_cb
_cp_in_use = true;
}
return ciot_opt_ret;
}
void AT_CellularContext::ciot_opt_cb(mbed::CellularNetwork::CIoT_Supported_Opt ciot_opt)
{
if (ciot_opt == mbed::CellularNetwork::CIOT_OPT_CONTROL_PLANE ||
ciot_opt == mbed::CellularNetwork::CIOT_OPT_BOTH) {
_cp_in_use = true;
} else {
_cp_in_use = false;
}
}
void AT_CellularContext::set_disconnect()
{
tr_debug("AT_CellularContext::set_disconnect()");
if (_is_connected) {
_is_connected = false;
_device->cellular_callback(NSAPI_EVENT_CONNECTION_STATUS_CHANGE, NSAPI_STATUS_DISCONNECTED, this);
}
}
void AT_CellularContext::set_cid(int cid)
{
_cid = cid;
if (_stack) {
static_cast<AT_CellularStack *>(_stack)->set_cid(_cid);
}
}
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