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LTE.h
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/*
* Copyright 2022 by Michael Ammann (@mazgch)
*
* 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.
*/
#ifndef __LTE_H__
#define __LTE_H__
#include <base64.h>
#include <SparkFun_u-blox_SARA-R5_Arduino_Library.h>
#include "HW.h"
#include "CONFIG.h"
#include "GNSS.h"
#include "UBXFILE.h"
const int LTE_1S_RETRY = 1000; //!< standard 1s retry
const int LTE_DETECT_RETRY = 5000; //!< delay between detect attempts
const int LTE_CHECKSIM_RETRY = 60000; //!< delay between SIM Card check attempts, SIM detection may be disables and you need to restart
const int LTE_ACTIVATION_RETRY = 10000; //!< delay between activation attempts
const int LTE_PROVISION_RETRY = 60000; //!< delay between provisioning attempts, provisioning may consume data
const int LTE_CONNECT_RETRY = 10000; //!< delay between server connection attempts to correction severs
const int LTE_MQTTCMD_DELAY = 100; //!< the client is not happy if multiple commands are sent too fast
const int LTE_POWER_ON_PULSE = 2000; //!< Power on pulse width (2s works for for SARA, LARA and LENA)
const int LTE_POWER_ON_WAITTIME = 4000; //!< Dont't do anything duing this time after the power on pulse
const int LTE_POWER_ON_WAITTIME_MAX = 10000; //!< If the device does not respond until this time, it has failed
const int LTE_POWER_ON_WAITSIMREADY = 4000; //!< It usually takes a few seconds to detect the SIM card.
const int LTE_PSD_PROFILE = 0; //!< The packet switched data profile used
const int LTE_HTTP_PROFILE = 0; //!< The HTTP profile used duing provisioning
const int LTE_SEC_PROFILE_HTTP = 1; //!< The security profile used for the HTTP connections druing provisioning
const int LTE_SEC_PROFILE_MQTT = 0; //!< The security profile used for the MQTT connections
const char* FILE_REQUEST = "req.json"; //!< Temporarly file name used for the request during HTTP GET transations (ZTP)
const char* FILE_RESP = "resp.json"; //!< Temporarly file name used for the response during HTTP POST and GET transations (AWS/ZTP)
const char* SEC_ROOT_CA ="aws-rootCA"; //!< Temporarly file name used when injecting the ROOT CA
const char* SEC_CLIENT_CERT = "pp-cert"; //!< Temporarly file name used when injecting the client certificate
const char* SEC_CLIENT_KEY = "pp-key"; //!< Temporarly file name used when injecting the client keys
const uint16_t HTTPS_PORT = 443; //!< The HTTPS default port
const int LTE_BAUDRATE = 115200; //!< baudrates 230400, 460800 or 921600 cause issues even when CTS/RTS is enabled
const char* LTE_TASK_NAME = "Lte"; //!< Lte task name
const int LTE_STACK_SIZE = 4*1024; //!< Lte task stack size
const int LTE_TASK_PRIO = 1; //!< Lte task priority
const int LTE_TASK_CORE = 1; //!< Lte task MCU code
// helper macros to handle the AT interface errors
#define LTE_CHECK_INIT int _step = 0; SARA_R5_error_t _err = SARA_R5_SUCCESS //!< init variable
#define LTE_CHECK_OK (SARA_R5_SUCCESS == _err) //!< record the return result
#define LTE_CHECK(x) if (SARA_R5_SUCCESS == _err) _step = x, _err //!< interim evaluate
#define LTE_CHECK_EVAL(txt) if (SARA_R5_SUCCESS != _err) log_e(txt ", AT sequence failed at step %d with error %d", _step, _err) //!< final verdict and log_e report
extern class LTE Lte; //!< Forward declaration of class
/** This class encapsulates all LTE functions.
*/
class LTE : public SARA_R5 {
public:
/** constructor
* \note we do not pass the pins to the class as we prefer to be in control of them
*/
LTE() : SARA_R5{ PIN_INVALID/*LTE_PWR_ON*/, PIN_INVALID/*LTE_RESET*/, 3/*retries*/ } {
state = INIT;
ntripSocket = -1;
hwInit();
}
/** initialize the object, this spins of a worker task.
*/
void init(void) {
xTaskCreatePinnedToCore(task, LTE_TASK_NAME, LTE_STACK_SIZE, this, LTE_TASK_PRIO, NULL, LTE_TASK_CORE);
}
protected:
// -----------------------------------------------------------------------
// MQTT / PointPerfect
// -----------------------------------------------------------------------
std::vector<String> topics; //!< vector with current subscribed topics
String subTopic; //!< requested topic to be subscribed (needed by the callback)
String unsubTopic; //!< requested topic to be un-subscribed (needed by the callback)
int mqttMsgs; //!< remember the number of messages pending indicated by the URC
//! this helper deals with some AT commands that are not yet implemted in LENA-R8 and throw a warning
SARA_R5_error_t LTE_IGNORE_LENA(SARA_R5_error_t err) {
if ((err != SARA_R5_SUCCESS) && module.startsWith("LENA-R8")) {
log_w("AT command error ignored due to LENA-R8 IP Status");
err = SARA_R5_SUCCESS;
}
return err;
}
/** Try to provision the PointPerfect to that we can start the MQTT server. This involves:
* 1) HTTPS request is made to AWS to GET theri ROOT CA
* 2) HTTPS request to Thingstream POSTing the device tocken to get the credentials and client cert, key and ID
*/
void mqttProvision(void) {
String rootCa = Config.getValue(CONFIG_VALUE_ROOTCA);
if (0 == rootCa.length()) {
log_i("HTTP AWS connect to \"%s:%d\" and GET \"%s\"", AWSTRUST_SERVER, HTTPS_PORT, AWSTRUST_ROOTCAPATH);
setHTTPCommandCallback(httpCallbackStatic); // callback will advance state
LTE_CHECK_INIT;
LTE_CHECK(1) = LTE_IGNORE_LENA( resetSecurityProfile(LTE_SEC_PROFILE_HTTP) );
LTE_CHECK(2) = configSecurityProfile(LTE_SEC_PROFILE_HTTP, SARA_R5_SEC_PROFILE_PARAM_CERT_VAL_LEVEL, SARA_R5_SEC_PROFILE_CERTVAL_OPCODE_NO); // no certificate and url/sni check
LTE_CHECK(3) = configSecurityProfile(LTE_SEC_PROFILE_HTTP, SARA_R5_SEC_PROFILE_PARAM_TLS_VER, SARA_R5_SEC_PROFILE_TLS_OPCODE_VER1_2);
LTE_CHECK(4) = configSecurityProfile(LTE_SEC_PROFILE_HTTP, SARA_R5_SEC_PROFILE_PARAM_CYPHER_SUITE, SARA_R5_SEC_PROFILE_SUITE_OPCODE_PROPOSEDDEFAULT);
LTE_CHECK(5) = configSecurityProfileString(LTE_SEC_PROFILE_HTTP, SARA_R5_SEC_PROFILE_PARAM_SNI, AWSTRUST_SERVER);
LTE_CHECK(6) = resetHTTPprofile(LTE_HTTP_PROFILE);
LTE_CHECK(7) = setHTTPserverName(LTE_HTTP_PROFILE, AWSTRUST_SERVER);
LTE_CHECK(8) = setHTTPserverPort(LTE_HTTP_PROFILE, HTTPS_PORT);
LTE_CHECK(9) = setHTTPauthentication(LTE_HTTP_PROFILE, false);
LTE_CHECK(10) = setHTTPsecure(LTE_HTTP_PROFILE, true, LTE_SEC_PROFILE_HTTP);
LTE_CHECK(11) = sendHTTPGET(LTE_HTTP_PROFILE, AWSTRUST_ROOTCAPATH, FILE_RESP);
LTE_CHECK_EVAL("HTTP AWS request");
} else {
String ztpReq = Config.ztpRequest();
if (0 < ztpReq.length()) {
log_i("HTTP ZTP connect to \"%s:%d\" and POST \"%s\"", THINGSTREAM_ZTPURL, HTTPS_PORT, ztpReq.c_str());
setHTTPCommandCallback(httpCallbackStatic); // callback will advance state
LTE_CHECK_INIT;
LTE_CHECK(1) = setSecurityManager(SARA_R5_SEC_MANAGER_OPCODE_IMPORT, SARA_R5_SEC_MANAGER_ROOTCA, SEC_ROOT_CA, rootCa);
LTE_CHECK(2) = LTE_IGNORE_LENA( resetSecurityProfile(LTE_SEC_PROFILE_HTTP) );
LTE_CHECK(3) = configSecurityProfile(LTE_SEC_PROFILE_HTTP, SARA_R5_SEC_PROFILE_PARAM_CERT_VAL_LEVEL, SARA_R5_SEC_PROFILE_CERTVAL_OPCODE_YESNOURL);
LTE_CHECK(4) = configSecurityProfile(LTE_SEC_PROFILE_HTTP, SARA_R5_SEC_PROFILE_PARAM_TLS_VER, SARA_R5_SEC_PROFILE_TLS_OPCODE_VER1_2);
LTE_CHECK(5) = configSecurityProfile(LTE_SEC_PROFILE_HTTP, SARA_R5_SEC_PROFILE_PARAM_CYPHER_SUITE, SARA_R5_SEC_PROFILE_SUITE_OPCODE_PROPOSEDDEFAULT);
LTE_CHECK(6) = configSecurityProfileString(LTE_SEC_PROFILE_HTTP, SARA_R5_SEC_PROFILE_PARAM_ROOT_CA, SEC_ROOT_CA);
LTE_CHECK(7) = configSecurityProfileString(LTE_SEC_PROFILE_HTTP, SARA_R5_SEC_PROFILE_PARAM_SNI, THINGSTREAM_SERVER);
deleteFile(FILE_REQUEST); // okay if this fails when file not present
LTE_CHECK(8) = appendFileContents(FILE_REQUEST, ztpReq); // now save the request, append to just deleted file
LTE_CHECK(9) = resetHTTPprofile(LTE_HTTP_PROFILE);
LTE_CHECK(10) = setHTTPserverName(LTE_HTTP_PROFILE, THINGSTREAM_SERVER);
LTE_CHECK(11) = setHTTPserverPort(LTE_HTTP_PROFILE, HTTPS_PORT); // make sure port is set
LTE_CHECK(12) = setHTTPauthentication(LTE_HTTP_PROFILE, false);
LTE_CHECK(13) = setHTTPsecure(LTE_HTTP_PROFILE, true, LTE_SEC_PROFILE_HTTP);
LTE_CHECK(14) = sendHTTPPOSTfile(LTE_HTTP_PROFILE, THINGSTREAM_ZTPPATH, FILE_RESP, FILE_REQUEST, SARA_R5_HTTP_CONTENT_APPLICATION_JSON);
LTE_CHECK_EVAL("HTTP ZTP request");
}
}
}
/** Connect to the Thingstream PointPerfect server using the credentials from ZTP process
* \param id the client ID for this device
*/
void mqttConnect(String id) {
String rootCa = Config.getValue(CONFIG_VALUE_ROOTCA);
String broker = Config.getValue(CONFIG_VALUE_BROKERHOST);
String cert = Config.getValue(CONFIG_VALUE_CLIENTCERT);
String key = Config.getValue(CONFIG_VALUE_CLIENTKEY);
// disconncect must fail here, so that we can connect
setMQTTCommandCallback(mqttCallbackStatic); // callback will advance state
// make sure the client is disconnected here
if (SARA_R5_SUCCESS == disconnectMQTT()) {
log_i("forced disconnect"); // if this sucessful it means were were still connected.
} else {
log_i("connect to \"%s:%d\" as client \"%s\"", broker.c_str(), MQTT_BROKER_PORT, id.c_str());
LTE_CHECK_INIT;
LTE_CHECK(1) = setSecurityManager(SARA_R5_SEC_MANAGER_OPCODE_IMPORT, SARA_R5_SEC_MANAGER_ROOTCA, SEC_ROOT_CA, rootCa);
LTE_CHECK(2) = setSecurityManager(SARA_R5_SEC_MANAGER_OPCODE_IMPORT, SARA_R5_SEC_MANAGER_CLIENT_CERT, SEC_CLIENT_CERT, cert);
LTE_CHECK(3) = setSecurityManager(SARA_R5_SEC_MANAGER_OPCODE_IMPORT, SARA_R5_SEC_MANAGER_CLIENT_KEY, SEC_CLIENT_KEY, key);
LTE_CHECK(4) = LTE_IGNORE_LENA( resetSecurityProfile(LTE_SEC_PROFILE_MQTT) );
LTE_CHECK(5) = configSecurityProfile(LTE_SEC_PROFILE_MQTT, SARA_R5_SEC_PROFILE_PARAM_CERT_VAL_LEVEL, SARA_R5_SEC_PROFILE_CERTVAL_OPCODE_YESNOURL);
LTE_CHECK(6) = configSecurityProfile(LTE_SEC_PROFILE_MQTT, SARA_R5_SEC_PROFILE_PARAM_TLS_VER, SARA_R5_SEC_PROFILE_TLS_OPCODE_VER1_2);
LTE_CHECK(7) = configSecurityProfile(LTE_SEC_PROFILE_MQTT, SARA_R5_SEC_PROFILE_PARAM_CYPHER_SUITE, SARA_R5_SEC_PROFILE_SUITE_OPCODE_PROPOSEDDEFAULT);
LTE_CHECK(8) = configSecurityProfileString(LTE_SEC_PROFILE_MQTT, SARA_R5_SEC_PROFILE_PARAM_ROOT_CA, SEC_ROOT_CA);
LTE_CHECK(9) = configSecurityProfileString(LTE_SEC_PROFILE_MQTT, SARA_R5_SEC_PROFILE_PARAM_CLIENT_CERT, SEC_CLIENT_CERT);
LTE_CHECK(10) = configSecurityProfileString(LTE_SEC_PROFILE_MQTT, SARA_R5_SEC_PROFILE_PARAM_CLIENT_KEY, SEC_CLIENT_KEY);
LTE_CHECK(11) = configSecurityProfileString(LTE_SEC_PROFILE_MQTT, SARA_R5_SEC_PROFILE_PARAM_SNI, broker);
LTE_CHECK(12) = nvMQTT(SARA_R5_MQTT_NV_RESTORE);
LTE_CHECK(13) = setMQTTclientId(id);
LTE_CHECK(14) = setMQTTserver(broker, MQTT_BROKER_PORT);
LTE_CHECK(15) = setMQTTsecure(true, LTE_SEC_PROFILE_MQTT);
LTE_CHECK(16) = connectMQTT();
LTE_CHECK_EVAL("setup and connect");
mqttMsgs = 0;
topics.clear();
subTopic = "";
unsubTopic = "";
}
}
/** Disconnect and cleanup the MQTT connection
* \return true if already disconnected (no need to wait for the callback)
*/
bool mqttStop(void) {
SARA_R5_error_t err = disconnectMQTT();
if (SARA_R5_SUCCESS == err) {
log_i("disconnect");
} else {
log_e("disconnect, failed with error %d", err);
}
return SARA_R5_SUCCESS != err;
}
/** The MQTT task is responsible for:
* 1) subscribing to topics
* 2) unsubscribing from topics
* 3) read MQTT data from the modem and inject it into the GNSS receiver
*/
void mqttTask(void) {
/* The LTE modem has difficulties subscribing/unsubscribing more than one topic at the same time
* We can only start one operation at a time wait for the URC and add a extra delay before we can
* do the next operation.
*/
bool busy = (0 < subTopic.length()) || (0 < unsubTopic.length());
if (!busy) {
std::vector<String> newTopics = Config.getTopics();
// loop through new topics and subscribe to the first topic that is not in our curent topics list.
for (auto it = newTopics.begin(); (it != newTopics.end()) && !busy; it = std::next(it)) {
String topic = *it;
std::vector<String>::iterator pos = std::find(topics.begin(), topics.end(), topic);
if (pos == topics.end()) {
SARA_R5_error_t err = subscribeMQTTtopic(0,topic);
if (SARA_R5_SUCCESS == err) {
log_d("subscribe requested topic \"%s\" qos %d", topic.c_str(), 0);
subTopic = topic;
} else {
log_e("subscribe request topic \"%s\" qos %d, failed with error %d", topic.c_str(), 0, err);
}
busy = true;
}
}
// loop through current topics and unsubscribe to the first topic that is not in the new topics list.
for (auto it = topics.begin(); (it != topics.end()) && !busy; it = std::next(it)) {
String topic = *it;
std::vector<String>::iterator pos = std::find(newTopics.begin(), newTopics.end(), topic);
if (pos == newTopics.end()) {
SARA_R5_error_t err = unsubscribeMQTTtopic(topic);
if (SARA_R5_SUCCESS == err) {
log_d("unsubscribe requested topic \"%s\"", topic.c_str());
unsubTopic = topic;
} else {
log_e("unsubscribe request topic \"%s\", failed with error %d", topic.c_str(), err);
}
busy = true;
}
}
if (!busy && (0 < mqttMsgs)) {
// at this point we are properly subscribed to the needed topics and can now read data
log_d("read request %d msg", mqttMsgs);
// The MQTT API does not allow getting the size before actually reading the data. So we
// have to allocate a big enough buffer. PointPerfect may send upto 9kB on the MGA topic.
uint8_t *buf = new uint8_t[MQTT_MAX_MSG_SIZE];
if (buf != NULL) {
String topic;
int len = -1;
int qos = -1;
SARA_R5_error_t err = readMQTT(&qos, &topic, buf, MQTT_MAX_MSG_SIZE, &len);
if (SARA_R5_SUCCESS == err) {
mqttMsgs = 0; // expect a URC afterwards
const char* strTopic = topic.c_str();
log_i("topic \"%s\" read %d bytes", strTopic, len);
GNSS::SOURCE source = GNSS::SOURCE::LTE;
if (topic.startsWith(MQTT_TOPIC_KEY_FORMAT)) {
source = GNSS::SOURCE::KEYS;
if (Config.setValue(CONFIG_VALUE_KEY, buf, len)) {
Config.save();
}
}
// if we detect data from a topic, then why not unsubscribe from it.
std::vector<String>::iterator pos = std::find(topics.begin(), topics.end(), topic);
if (pos == Lte.topics.end()) {
log_e("getting data from an unexpected topic \"%s\"", strTopic);
if (!busy) {
err = unsubscribeMQTTtopic(topic);
if (SARA_R5_SUCCESS == err) {
log_d("unsubscribe requested for unexpected topic \"%s\"", strTopic);
unsubTopic = topic;
} else {
log_e("unsubscribe request for unexpected topic \"%s\", failed with error %d", topic.c_str(), err);
}
busy = true;
}
} else if (topic.equals(MQTT_TOPIC_FREQ)) {
// Do not inject this json data to GNSS but extract the LBAND frequencies
Config.setLbandFreqs(buf, (size_t)len);
} else {
// anything else can be sent to the GNSS as is
len = Gnss.inject(buf, (size_t)len, source);
}
} else {
log_e("read failed with error %d", err);
}
// we need to free the buffer, as the inject function took a copy with only the required size
delete [] buf;
}
}
}
}
/** The MQTT callback processes the URC and is responsible for advancing the state.
* \param command the MQTT command
* \param request the response code 1 = sucess, 0 = error
*/
void mqttCallback(int command, int result) {
log_d("%d command %d result %d", command, result);
if (result == 0) {
int code, code2;
SARA_R5_error_t err = getMQTTprotocolError(&code, &code2);
if (SARA_R5_SUCCESS == err) {
log_e("command %d protocol error code %d code2 %d", command, code, code2);
} else {
log_e("command %d protocol error failed with error", command, err);
}
} else {
switch (command) {
case SARA_R5_MQTT_COMMAND_LOGIN:
if (state != ONLINE) {
log_e("login wrong state");
} else {
log_i("login");
setState(MQTT, LTE_MQTTCMD_DELAY);
}
break;
case SARA_R5_MQTT_COMMAND_LOGOUT:
if ((state != MQTT) && (state != ONLINE)) {
log_e("logout wrong state");
} else {
log_i("logout");
mqttMsgs = 0;
topics.clear();
subTopic = "";
unsubTopic = "";
setState(ONLINE, LTE_MQTTCMD_DELAY);
}
break;
case SARA_R5_MQTT_COMMAND_SUBSCRIBE:
if (state != MQTT) {
log_e("subscribe wrong state");
} else if (!subTopic.length()) {
log_e("subscribe result %d but no topic", result);
} else {
log_i("subscribe result %d topic \"%s\"", result, subTopic.c_str());
topics.push_back(subTopic);
subTopic = "";
setState(MQTT, LTE_MQTTCMD_DELAY);
}
break;
case SARA_R5_MQTT_COMMAND_UNSUBSCRIBE:
if (state != MQTT) {
log_e("unsubscribe wrong state");
} else if (!unsubTopic.length()) {
log_e("unsubscribe result %d but no topic", result);
} else {
std::vector<String>::iterator pos = std::find(topics.begin(), topics.end(), unsubTopic);
if (pos == topics.end()) {
topics.erase(pos);
log_i("unsubscribe result %d topic \"%s\"", result, unsubTopic.c_str());
unsubTopic = "";
setState(MQTT, LTE_MQTTCMD_DELAY);
} else {
log_e("unsubscribe result %d topic \"%s\" but topic not in list", result, unsubTopic.c_str());
}
}
break;
case SARA_R5_MQTT_COMMAND_READ:
if (state != MQTT) {
log_e("read wrong state");
} else {
log_d("read result %d", result);
mqttMsgs = result;
setState(MQTT, LTE_MQTTCMD_DELAY);
}
break;
default:
break;
}
}
}
//! static callback helper, regCallback will do the real work
static void mqttCallbackStatic(int command, int result) {
Lte.mqttCallback(command, result);
}
/** The HTTP callback processes the URC and is responsible for advancing the state.
* \param profile the HTTP profile
* \param command the HTTP command
* \param request the response code 1 = sucess, 0 = error
*/
void httpCallback(int profile, int command, int result) {
log_d("profile %d command %d result %d", profile, command, result);
if (result == 0) {
int cls, code;
SARA_R5_error_t err = getHTTPprotocolError(profile, &cls, &code);
if (SARA_R5_SUCCESS == err) {
log_e("profile %d command %d protocol error class %d code %d", profile, command, cls, code);
} else {
log_e("profile %d command %d protocol error failed with error %d", profile, command, err);
}
} else if ((profile == LTE_HTTP_PROFILE) && ((command == SARA_R5_HTTP_COMMAND_GET) ||
(command == SARA_R5_HTTP_COMMAND_POST_FILE))) {
String str;
LTE_CHECK_INIT;
LTE_CHECK(1) = getFileContents(FILE_RESP, &str);
LTE_CHECK(2) = deleteFile(FILE_RESP);
LTE_CHECK_EVAL("HTTP read");
if (LTE_CHECK_OK) {
const char START_TAG[] = "\r\n\r\n";
int offset = str.indexOf(START_TAG);
if (offset) {
str.remove(0, offset + sizeof(START_TAG) - 1);
if (command == SARA_R5_HTTP_COMMAND_GET) {
// save the AWS root CA
Config.setValue(CONFIG_VALUE_ROOTCA, str);
setState(ONLINE);
} else if (command == SARA_R5_HTTP_COMMAND_POST_FILE) {
// save the ZTP
String rootCa = Config.getValue(CONFIG_VALUE_ROOTCA);
String id = Config.setZtp(str, rootCa);
setState(ONLINE);
}
}
}
}
}
//! static callback helper, regCallback will do the real work
static void httpCallbackStatic(int profile, int command, int result) {
Lte.httpCallback(profile, command, result);
}
// -----------------------------------------------------------------------
// NTRIP / RTCM
// -----------------------------------------------------------------------
int32_t ntripGgaMs; //!< time tag (millis()) of next GGA to be sent
int ntripSocket; //!< the socket handle
/** Connect to a NTRIP server
* \param ntrip the server:port/mountpoint to connect to
* \return connection success
*/
bool ntripConnect(String ntrip) {
int pos1 = ntrip.indexOf(':');
int pos2 = ntrip.indexOf('/');
pos1 = (-1 == pos1) ? pos2 : pos1;
String server = (-1 == pos1) ? "" : ntrip.substring(0,pos1);
uint16_t port = (pos1 == pos2) ? NTRIP_SERVER_PORT : ntrip.substring(pos1+1,pos2).toInt();
String mntpnt = (-1 == pos2) ? "" : ntrip.substring(pos2+1);
if ((0 == server.length()) || (0 == mntpnt.length())) return false;
String user = Config.getValue(CONFIG_VALUE_NTRIP_USERNAME);
String pwd = Config.getValue(CONFIG_VALUE_NTRIP_PASSWORD);
//setSocketReadCallbackPlus(&onSocketData);
//setSocketCloseCallback(&onSocketClose);
ntripSocket = socketOpen(SARA_R5_TCP);
if (0 <= ntripSocket) {
String authEnc;
String authHead;
if (0 < user.length() && 0 < pwd.length()) {
authEnc = base64::encode(user + ":" + pwd);
authHead = "Authorization: Basic ";
authHead += authEnc + "\r\n";
}
log_i("server \"%s:%d\" GET \"/%s\" auth \"%s\"", server.c_str(), port, mntpnt.c_str(), authEnc.c_str());
char buf[256];
int len = sprintf(buf, "GET /%s HTTP/1.0\r\n"
"User-Agent: " CONFIG_DEVICE_TITLE "\r\n"
"%s\r\n", mntpnt.c_str(), authHead.c_str());
LTE_CHECK_INIT;
LTE_CHECK(1) = socketConnect(ntripSocket, server.c_str(), port);
LTE_CHECK(2) = socketWrite(ntripSocket, buf, len);
int avail = 0;
const char* expectedReply = 0 == mntpnt.length() ? NTRIP_RESPONSE_SOURCETABLE : NTRIP_RESPONSE_ICY;
len = strlen(expectedReply);
int32_t start = millis();
int32_t now;
do {
vTaskDelay(10);
LTE_CHECK(3) = socketReadAvailable(ntripSocket, &avail);
now = millis();
} while (LTE_CHECK_OK && (0 < (start + NTRIP_CONNECT_TIMEOUT - now)) && (avail < len));
if (avail >= len) {
avail = len;
}
if (avail > 0) {
memset(&buf, 0, len+1);
LTE_CHECK(4) = socketRead(ntripSocket, avail, buf, &avail);
}
LTE_CHECK_EVAL("connect");
if (LTE_CHECK_OK) {
buf[avail] = 0;
if ((avail == len) && (0 == strncmp(buf, expectedReply, len))) {
log_i("got expected reply \"%.*s\\r\\n\"", len-2, expectedReply);
ntripGgaMs = now;
} else {
log_e("expected reply \"%.*s\\r\\n\" failed after %d ms, got \"%s\"", len-2, expectedReply, now - start, buf);
ntripStop();
}
} else {
ntripStop();
}
}
return 0 <= ntripSocket;
}
/** Disconnect and cleanup the NTRIP connection close the socket
*/
void ntripStop(void) {
if (ntripSocket >= 0) {
SARA_R5_error_t err = socketClose(ntripSocket);
if (err == SARA_R5_SUCCESS) {
log_i("disconnected");
} else {
log_e("disconnect, failed with error %d", err);
}
ntripSocket = -1;
}
}
/** The NTRIP task is responsible for:
* 1) reading NTRIP data from the modem and inject it into the GNSS receiver.
* 2) sending a GGA from time to time to allow VRS services to adjust their correction stream
*/
void ntripTask(void) {
if (ntripSocket >= 0) {
int messageSize = 0;
LTE_CHECK_INIT;
LTE_CHECK(1) = socketReadAvailable(ntripSocket, &messageSize);
if (LTE_CHECK_OK && (0 < messageSize)) {
GNSS::MSG msg;
msg.data = new uint8_t[messageSize];
if (NULL != msg.data) {
int readSize = 0;
LTE_CHECK(2) = socketRead(ntripSocket, messageSize, (char*)msg.data, &readSize);
if (LTE_CHECK_OK && (readSize == messageSize)) {
msg.size = readSize;
msg.source = GNSS::SOURCE::LTE;
log_i("read %d bytes", readSize);
Gnss.inject(msg);
} else {
log_e("read %d bytes failed reading after %d", messageSize, readSize);
delete [] msg.data;
}
} else {
log_e("read %d bytes failed, no memory", messageSize);
}
}
LTE_CHECK_EVAL("read");
long now = millis();
if (ntripGgaMs - now <= 0) {
ntripGgaMs = now + NTRIP_GGA_RATE;
String gga = Config.getValue(CONFIG_VALUE_NTRIP_GGA);
int len = gga.length();
if (0 < len) {
gga += "\r\n";
LTE_CHECK_INIT;
LTE_CHECK(1) = socketWrite(ntripSocket, gga);
LTE_CHECK_EVAL("write");
if (LTE_CHECK_OK) {
log_i("write \"%.*s\\r\\n\" %d bytes",len, gga.c_str(), len+2);
}
}
}
}
}
// -----------------------------------------------------------------------
// LTE
// -----------------------------------------------------------------------
String module; //!< a string holding the module name (SARA-R5, LARA-R6 or LENA-R8)
/** detect the LTE modem
* \return the detection status
*/
bool lteDetect(void) {
bool ok = hwReady();
if (ok) {
module = getModelID();
String version = getFirmwareVersion();
log_i("config manufacturer \"%s\" model=\"%s\" version=\"%s\"",
getManufacturerID().c_str(), module.c_str(), version.c_str());
if ((version.toDouble() < 0.13) && module.startsWith("LARA-R6")) {
log_e("LARA-R6 firmware %s has MQTT limitations, please update firmware", version.c_str());
}
else if ((version.toDouble() < 2.00) && module.startsWith("LENA-R8")) {
log_e("LENA-R8 firmware %s has limitations, please update firmware", version.c_str());
}
#if ((HW_TARGET == UBLOX_XPLR_HPG2_C214) || (HW_TARGET == MAZGCH_HPG_SOLUTION_V09))
// enableSIMDetectAndHotswap();
#endif
// wait for the SIM to get ready ... this can take a while (<4s)
SARA_R5_error_t err = SARA_R5_ERROR_ERROR;
for (int i = 0; i < LTE_POWER_ON_WAITSIMREADY/100; i ++) {
err = getSimStatus(NULL);
if (SARA_R5_ERROR_ERROR != err)
break;
delay(100);
}
if (SARA_R5_ERROR_ERROR == err) {
log_e("SIM card not found, err %d", err);
}
}
return ok;
}
/** initialize the LTE modem and report useful information
* \return initialisation process sucess
*/
bool lteInit(void) {
String code;
LTE_CHECK_INIT;
LTE_CHECK(1) = getSimStatus(&code);
if (LTE_CHECK_OK && code.equals("SIM PIN")) {
String pin = Config.getValue(CONFIG_VALUE_SIMPIN);
if (pin.length()) {
LTE_CHECK(2) = setSimPin(pin);
LTE_CHECK(3) = getSimStatus(&code); // retry get the SIM status
LTE_CHECK_EVAL("SIM card initialisation");
}
}
if (LTE_CHECK_OK) {
if (code.equals("READY")) {
log_i("SIM card status \"%s\" CCID=\"%s\"", code.c_str(), getCCID().c_str());
String subNo = getSubscriberNo();
int from = subNo.indexOf(",\"");
int to = (-1 != from) ? subNo.indexOf("\"", from + 2) : -1;
subNo = ((-1 != from) && (-1 != to)) ? subNo.substring(from + 2, to) : "";
log_i("IMEI=\"%s\" IMSI=\"%s\" subscriber=\"%s\"", getIMEI().c_str(), getIMSI().c_str(), subNo.c_str());
// configure the MNO profile
if (!module.startsWith("LENA-R8")) {
String mno = Config.getValue(CONFIG_VALUE_MNOPROF);
if (mno.length()) {
mobile_network_operator_t eMno = (mobile_network_operator_t)mno.toInt();
if (!setNetworkProfile(eMno)) {
log_e("detect setting network profile for MNO %d failed", eMno);
}
}
}
// register the callbacks
LTE_CHECK_INIT;
LTE_CHECK(1) = setEpsRegistrationCallback(epsRegCallbackStatic);
LTE_CHECK(2) = setRegistrationCallback(regCallbackStatic);
// set the APn
String apn = Config.getValue(CONFIG_VALUE_LTEAPN);
if (apn.length()) {
LTE_CHECK(3) = setAPN(apn);
}
LTE_CHECK_EVAL("callback and apn config");
return true;
}
else {
log_w("SIM card status \"%s\"", code.c_str());
}
}
return false;
}
//! helper look up table for string conversion of registration status
const char *REG_STATUS_LUT[11] = {
"not registered",
"home",
"searching",
"denied",
"unknown",
"roaming",
"home sms only",
"roaming sms only",
"emergency service only",
"home cfsb not preferred",
"roaming cfsb not preferred"
};
//! helper look up table for string conversion of network activation
const char *REG_ACT_LUT[10] = {
"GSM",
"GSM COMPACT",
"UTRAN",
"GSM/GPRS + EDGE",
"UTRAN + HSDPA",
"UTRAN + HSUPA",
"UTRAN + HSDPA + HSUPA",
"E-UTRAN",
"EC-GSM-IoT (A/Gb mode)",
"E-UTRAN (NB-S1 mode)"
};
//! helper to safely convert the string with above tables
#define REG_LUT(l, x) ((((unsigned int)x) <= (sizeof(l)/sizeof(*l))) ? l[x] : "unknown")
/** check if we are registered
* \return registration success
*/
bool lteRegistered(void) {
SARA_R5_registration_status_t status = registration(true); // EPS
const char* statusText = REG_LUT(REG_STATUS_LUT, status);
if ((status == SARA_R5_REGISTRATION_HOME) || (status == SARA_R5_REGISTRATION_ROAMING)) {
String op = "";
getOperator(&op);
log_i("registered %d(%s) operator \"%s\" rssi %d clock \"%s\"",
status, statusText, op.c_str(), rssi(), clock().c_str());
// AT+UPSV?
// AT+CLCK="SC",2
return true;
}
else {
log_d("EPS registration status %d(%s), waiting ...", status, statusText);
}
return false;
}
/** evaluate registration status and report it
* \param status the registration status
* \param tacLac the tac or lac
* \param ci the ci
* \param Act the network activation
* \param strTacLac a string indicating if tacLac is either tac or lac.
*/
void regCallback(SARA_R5_registration_status_t status, unsigned int tacLac, unsigned int ci, int Act, const char* strTacLac)
{
const char* actText = REG_LUT(REG_ACT_LUT, Act);
const char* statusText = REG_LUT(REG_STATUS_LUT, status);
log_d("status %d(%s) %s \"%04X\" ci \"%08X\" Act %d(%s)", status, statusText, strTacLac, tacLac, ci, Act, actText); /*unused*/ (void)actText; (void)statusText;
if (((status == SARA_R5_REGISTRATION_HOME) || (status == SARA_R5_REGISTRATION_ROAMING)) && (state < REGISTERED)) {
setState(REGISTERED);
} else if ((status == SARA_R5_REGISTRATION_SEARCHING) && (state >= REGISTERED)) {
setState(WAITREGISTER);
}
}
//! static callback helper, regCallback will do the real work
static void epsRegCallbackStatic(SARA_R5_registration_status_t status, unsigned int tac, unsigned int ci, int Act) {
Lte.regCallback(status, tac, ci, Act, "tac");
}
//! static callback helper, regCallback will do the real work
static void regCallbackStatic(SARA_R5_registration_status_t status, unsigned int lac, unsigned int ci, int Act) {
Lte.regCallback(status, lac, ci, Act, "lac");
}
/** make sure the modem is activated properly. Some modem do this automatically other need some help.
* \return activaion sucess
*/
bool lteActivate(void) {
if (module.startsWith("LARA-R6")) {
return true;
} else if (module.startsWith("LENA-R8")) {
String apn;
IPAddress ip(0, 0, 0, 0);
SARA_R5_pdp_type pdpType = PDP_TYPE_INVALID;
LTE_CHECK_INIT;
LTE_CHECK(1) = getAPN(0, &apn, &ip, &pdpType);
// on LENA-R8 we need to move a IP context 0 to a different context id other than 0
// ok if these commands fail as the context could be already active ...
if (LTE_CHECK_OK && (0 < apn.length()) && (pdpType != PDP_TYPE_NONIP)) {
setAPN(apn, 1 /* LENA only has contexts 0 to 7, do not use SARA_R5_NUM_PDP_CONTEXT_IDENTIFIERS-1 */ , pdpType);
}
activatePDPcontext(true);
LTE_CHECK_EVAL("LTE activate context");
if (LTE_CHECK_OK) {
return true;
}
} else /* SARA-R5 */ {
performPDPaction(LTE_PSD_PROFILE, SARA_R5_PSD_ACTION_DEACTIVATE);
for (int cid = 0; cid < SARA_R5_NUM_PDP_CONTEXT_IDENTIFIERS; cid++)
{
String apn;
IPAddress ip(0, 0, 0, 0);
SARA_R5_pdp_type pdpType = PDP_TYPE_INVALID;
LTE_CHECK_INIT;
LTE_CHECK(1) = getAPN(cid, &apn, &ip, &pdpType);
if ((LTE_CHECK_OK) && (0 < apn.length()) && (PDP_TYPE_INVALID != pdpType))
{
// Activate the profile
log_i("activate profile for apn \"%s\" with IP %s pdp %d", apn.c_str(), ip.toString().c_str(), pdpType);
setPSDActionCallback(psdCallbackStatic);
LTE_CHECK(2) = setPDPconfiguration(LTE_PSD_PROFILE, SARA_R5_PSD_CONFIG_PARAM_PROTOCOL, pdpType);
LTE_CHECK(3) = setPDPconfiguration(LTE_PSD_PROFILE, SARA_R5_PSD_CONFIG_PARAM_MAP_TO_CID, cid);
LTE_CHECK(4) = performPDPaction(LTE_PSD_PROFILE, SARA_R5_PSD_ACTION_ACTIVATE);
LTE_CHECK_EVAL("profile activation");
if (LTE_CHECK_OK) {
return true; // abort the loop as we found a good profile
}
}
}
}
return false;
}
/** the packet switched data activation callback
* \param profile the psd profile
* \param ip the ip address for this profile
*/
static void psdCallbackStatic(int profile, IPAddress ip) {
log_d("psdCallback profile %d IP %s", profile, ip.toString().c_str());
if (profile == LTE_PSD_PROFILE) {
String id = Config.getValue(CONFIG_VALUE_CLIENTID);
Lte.setState(ONLINE);
}
}
// -----------------------------------------------------------------------
// STATEMACHINE
// -----------------------------------------------------------------------
//! states of the statemachine
typedef enum {
INIT = 0,
CHECKSIM,
SIMREADY,
WAITREGISTER,
REGISTERED,
ONLINE,
MQTT,
NTRIP,
NUM
} STATE;
//! string conversion helper table, must be aligned and match with STATE
const char* STATE_LUT[STATE::NUM] = {
"init",
"check sim",
"sim ready",
"wait register",
"registered",
"online",
"mqtt",
"ntrip"
};
STATE state; //!< the current state
int32_t ttagNextTry; //!< time tag when to call the state machine again
/** advance the state and report transitions
* \param newState the new state
* \param delay schedule delay
*/
void setState(STATE newState, int32_t delay = 0) {
if (state != newState) {
log_i("state change %d(%s)", newState, STATE_LUT[newState]);
state = newState;
}
ttagNextTry = millis() + delay;
}
/* FreeRTOS static task function, will just call the objects task function
* \param pvParameters the Lte object (this)
*/
static void task(void * pvParameters) {
((LTE*) pvParameters)->task();
}
/** This task handling the whole LTE state machine, here is where different activities are scheduled
* and where the code decides what actions to perform.
*/
void task(void) {
if (!lteDetect()) {
log_w("LARA-R6/SARA-R5/LENA-R8 not detected, check wiring");
} else {
setState(CHECKSIM);
}
while(true) {
if ((PIN_INVALID != LTE_ON) && (state != INIT)) {
// detect if LTE was turned off
if (LTE_ON_ACTIVE != digitalRead(LTE_ON)) {
UbxSerial.end();
setState(INIT, LTE_DETECT_RETRY);
}
}
if (state != INIT) {
SARA_R5::poll();
}
int32_t now = millis();
if (0 >= (ttagNextTry - now)) {
ttagNextTry = now + LTE_1S_RETRY;
String id = Config.getValue(CONFIG_VALUE_CLIENTID);
String ntrip = Config.getValue(CONFIG_VALUE_NTRIP_SERVER);
String useSrc = Config.getValue(CONFIG_VALUE_USESOURCE);
bool onlineWlan = WiFi.status() == WL_CONNECTED;
bool useWlan = (-1 != useSrc.indexOf("WLAN")) && onlineWlan;
bool useLte = (-1 != useSrc.indexOf("LTE")) && !useWlan;
bool useNtrip = useLte && useSrc.startsWith("NTRIP:");
bool useMqtt = useLte && useSrc.startsWith("PointPerfect:");
switch (state) {
case INIT:
ttagNextTry = now + LTE_DETECT_RETRY;
if (lteDetect()) {
setState(CHECKSIM);
}
break;
case CHECKSIM:
ttagNextTry = now + LTE_CHECKSIM_RETRY;
if (lteInit()) {
setState(WAITREGISTER);
}
break;
case WAITREGISTER:
if (lteRegistered()) {
setState(REGISTERED);
}
break;
case REGISTERED:
ttagNextTry = now + LTE_ACTIVATION_RETRY;
if (lteActivate()) {
setState(ONLINE);
}
break;
case ONLINE:
if (useNtrip) {
if (0 < ntrip.length()) {
ttagNextTry = now + LTE_CONNECT_RETRY;
if (ntripConnect(ntrip)) {
setState(NTRIP);
}
}
} else if (useMqtt) {
if (0 == id.length()) {
ttagNextTry = now + LTE_PROVISION_RETRY;
mqttProvision(); // callback will advance the state
} else {
ttagNextTry = now + LTE_CONNECT_RETRY;
mqttConnect(id); // callback will advance the state
}
}
break;
case MQTT:
if (!useMqtt || (0 == id.length())) {
if (mqttStop()) {
setState(ONLINE);
}
} else {
mqttTask();
}
break;
case NTRIP:
if (!useNtrip || (0 == ntrip.length())) {
ntripStop();
setState(ONLINE);
} else {
ntripTask();
}
break;
default:
setState(INIT);
break;
}
}
vTaskDelay(30);
}
}
// -----------------------------------------------------------------------
// HARDWARE
// -----------------------------------------------------------------------
/** The modem is connected using different GPIOs and full 8 wire Serial port.
* this function makes sure that at boot all the pins are properly configured.
* The pins are defined in the HW.h file and depend on the board compiled for.
*/
void hwInit(void) {
// The current SARA-R5 library is setting the LTE_RESET and LTE_PWR_ON pins to input after using them,
// This is not ideal for the v0.8/v0.9 hardware. Therefore it is prefered to control the LTE_RESET
// and LTE_PWR_ON externally in our code here. We also like to have better control of the pins to
// support different variants of LTE modems.
// Module Power On time Power Off time Reset
// SARA-R5 0.1/1-2s 23s + 1.5sReset 0.1s
// LARA-R6 0.15-3.2s >1.5s 0.05-6s (10s emergency)
// LENA-R8 >2s >3.1s 0.05s
// The LTE_RESET pin is active LOW, HIGH = idle, LOW = in reset
// The LTE_RESET pin unfortunately does not have a pull up resistor on the v0.8/v0.9 hardware
if (PIN_INVALID != LTE_RESET) {
digitalWrite(LTE_RESET, HIGH);
pinMode(LTE_RESET, OUTPUT);
digitalWrite(LTE_RESET, HIGH);
}
// The LTE_PWR_ON pin is usually active HIGH, LOW = idle, defined by LTE_PWR_ON_ACTIVE, active timings see table above
// The LTE_PWR_ON pin has a external pull low resistor on the board.
if (PIN_INVALID != LTE_PWR_ON) {
digitalWrite(LTE_PWR_ON, !LTE_PWR_ON_ACTIVE);
pinMode(LTE_PWR_ON, OUTPUT);
digitalWrite(LTE_PWR_ON, !LTE_PWR_ON_ACTIVE);
}
if (PIN_INVALID != LTE_TXI) {
digitalWrite(LTE_TXI, HIGH);
pinMode(LTE_TXI, OUTPUT);
digitalWrite(LTE_TXI, HIGH);
}
if (PIN_INVALID != LTE_RTS) {
digitalWrite(LTE_RTS, LOW);
pinMode(LTE_RTS, OUTPUT);
digitalWrite(LTE_RTS, LOW);
}
if (PIN_INVALID != LTE_DTR) {
digitalWrite(LTE_DTR, LOW);
pinMode(LTE_DTR, OUTPUT);