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Add Azure IoT Hub GSM, NB, and WiFi examples
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‎examples/Azure IoT Hub/Azure_IoT_Hub_GSM/Azure_IoT_Hub_GSM.ino

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/*
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Azure IoT Hub GSM
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This sketch securely connects to an Azure IoT Hub using MQTT over GSM/3G.
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It uses a private key stored in the ATECC508A and a self signed public
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certificate for SSL/TLS authetication.
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It publishes a message every 5 seconds to "devices/{deviceId}/messages/events/" topic
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and subscribes to messages on the "devices/{deviceId}/messages/devicebound/#"
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topic.
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The circuit:
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- MKR GSM 1400 board
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- Antenna
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- SIM card with a data plan
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- LiPo battery
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This example code is in the public domain.
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*/
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#include <ArduinoBearSSL.h>
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#include <ArduinoECCX08.h>
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#include <utility/ECCX08SelfSignedCert.h>
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#include <ArduinoMqttClient.h>
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#include <MKRGSM.h>
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#include "arduino_secrets.h"
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/////// Enter your sensitive data in arduino_secrets.h
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const char pinnumber[] = SECRET_PINNUMBER;
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const char gprs_apn[] = SECRET_GPRS_APN;
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const char gprs_login[] = SECRET_GPRS_LOGIN;
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const char gprs_password[] = SECRET_GPRS_PASSWORD;
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const char broker[] = SECRET_BROKER;
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String deviceId = SECRET_DEVICE_ID;
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GSM gsmAccess;
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GPRS gprs;
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GSMClient gsmClient; // Used for the TCP socket connection
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BearSSLClient sslClient(gsmClient); // Used for SSL/TLS connection, integrates with ECC508
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MqttClient mqttClient(sslClient);
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unsigned long lastMillis = 0;
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void setup() {
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Serial.begin(9600);
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while (!Serial);
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if (!ECCX08.begin()) {
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Serial.println("No ECCX08 present!");
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while (1);
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}
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// reconstruct the self signed cert
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ECCX08SelfSignedCert.beginReconstruction(0, 8);
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ECCX08SelfSignedCert.setCommonName(ECCX08.serialNumber());
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ECCX08SelfSignedCert.endReconstruction();
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// Set a callback to get the current time
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// used to validate the servers certificate
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ArduinoBearSSL.onGetTime(getTime);
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// Set the ECCX08 slot to use for the private key
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// and the accompanying public certificate for it
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sslClient.setEccSlot(0, ECCX08SelfSignedCert.bytes(), ECCX08SelfSignedCert.length());
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// Set the client id used for MQTT as the device id
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mqttClient.setId(deviceId);
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// Set the username to "<broker>/<device id>/api-version=2018-06-30" and empty password
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String username;
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username += broker;
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username += "/";
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username += deviceId;
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username += "/api-version=2018-06-30";
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mqttClient.setUsernamePassword(username, "");
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// Set the message callback, this function is
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// called when the MQTTClient receives a message
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mqttClient.onMessage(onMessageReceived);
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}
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void loop() {
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if (gsmAccess.status() != GSM_READY || gprs.status() != GPRS_READY) {
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connectGSM();
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}
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if (!mqttClient.connected()) {
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// MQTT client is disconnected, connect
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connectMQTT();
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}
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// poll for new MQTT messages and send keep alives
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mqttClient.poll();
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// publish a message roughly every 5 seconds.
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if (millis() - lastMillis > 5000) {
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lastMillis = millis();
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publishMessage();
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}
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}
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unsigned long getTime() {
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// get the current time from the cellular module
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return gsmAccess.getTime();
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}
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void connectGSM() {
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Serial.println("Attempting to connect to the cellular network");
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while ((gsmAccess.begin(pinnumber) != GSM_READY) ||
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(gprs.attachGPRS(gprs_apn, gprs_login, gprs_password) != GPRS_READY)) {
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// failed, retry
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Serial.print(".");
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delay(1000);
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}
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Serial.println("You're connected to the cellular network");
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Serial.println();
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}
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void connectMQTT() {
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Serial.print("Attempting to MQTT broker: ");
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Serial.print(broker);
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Serial.println(" ");
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while (!mqttClient.connect(broker, 8883)) {
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// failed, retry
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Serial.print(".");
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Serial.println(mqttClient.connectError());
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delay(5000);
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}
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Serial.println();
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Serial.println("You're connected to the MQTT broker");
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Serial.println();
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// subscribe to a topic
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mqttClient.subscribe("devices/" + deviceId + "/messages/devicebound/#");
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}
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void publishMessage() {
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Serial.println("Publishing message");
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// send message, the Print interface can be used to set the message contents
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mqttClient.beginMessage("devices/" + deviceId + "/messages/events/");
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mqttClient.print("hello ");
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mqttClient.print(millis());
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mqttClient.endMessage();
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}
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void onMessageReceived(int messageSize) {
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// we received a message, print out the topic and contents
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Serial.print("Received a message with topic '");
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Serial.print(mqttClient.messageTopic());
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Serial.print("', length ");
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Serial.print(messageSize);
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Serial.println(" bytes:");
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// use the Stream interface to print the contents
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while (mqttClient.available()) {
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Serial.print((char)mqttClient.read());
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}
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Serial.println();
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Serial.println();
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}

‎examples/Azure IoT Hub/Azure_IoT_Hub_GSM/arduino_secrets.h

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// GSM settings
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#define SECRET_PINNUMBER ""
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#define SECRET_GPRS_APN "GPRS_APN" // replace your GPRS APN
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#define SECRET_GPRS_LOGIN "login" // replace with your GPRS login
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#define SECRET_GPRS_PASSWORD "password" // replace with your GPRS password
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// Fill in the hostname of your Azure IoT Hub broker
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#define SECRET_BROKER "<hub name>.azure-devices.net"
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// Fill in the device id
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#define SECRET_DEVICE_ID "<device id>"

‎examples/Azure IoT Hub/Azure_IoT_Hub_NB/Azure_IoT_Hub_NB.ino

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/*
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Azure IoT Hub NB
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This sketch securely connects to an Azure IoT Hub using MQTT over NB IoT/LTE Cat M1.
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It uses a private key stored in the ATECC508A and a self signed public
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certificate for SSL/TLS authetication.
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It publishes a message every 5 seconds to "devices/{deviceId}/messages/events/" topic
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and subscribes to messages on the "devices/{deviceId}/messages/devicebound/#"
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topic.
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The circuit:
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- MKR NB 1500 board
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- Antenna
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- SIM card with a data plan
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- LiPo battery
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This example code is in the public domain.
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*/
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#include <ArduinoBearSSL.h>
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#include <ArduinoECCX08.h>
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#include <utility/ECCX08SelfSignedCert.h>
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#include <ArduinoMqttClient.h>
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#include <MKRNB.h>
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#include "arduino_secrets.h"
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/////// Enter your sensitive data in arduino_secrets.h
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const char pinnumber[] = SECRET_PINNUMBER;
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const char broker[] = SECRET_BROKER;
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String deviceId = SECRET_DEVICE_ID;
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NB nbAccess;
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GPRS gprs;
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NBClient nbClient; // Used for the TCP socket connection
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BearSSLClient sslClient(nbClient); // Used for SSL/TLS connection, integrates with ECC508
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MqttClient mqttClient(sslClient);
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unsigned long lastMillis = 0;
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void setup() {
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Serial.begin(9600);
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while (!Serial);
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if (!ECCX08.begin()) {
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Serial.println("No ECCX08 present!");
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while (1);
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}
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// reconstruct the self signed cert
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ECCX08SelfSignedCert.beginReconstruction(0, 8);
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ECCX08SelfSignedCert.setCommonName(ECCX08.serialNumber());
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ECCX08SelfSignedCert.endReconstruction();
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// Set a callback to get the current time
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// used to validate the servers certificate
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ArduinoBearSSL.onGetTime(getTime);
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// Set the ECCX08 slot to use for the private key
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// and the accompanying public certificate for it
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sslClient.setEccSlot(0, ECCX08SelfSignedCert.bytes(), ECCX08SelfSignedCert.length());
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// Set the client id used for MQTT as the device id
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mqttClient.setId(deviceId);
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// Set the username to "<broker>/<device id>/api-version=2018-06-30" and empty password
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String username;
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username += broker;
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username += "/";
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username += deviceId;
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username += "/api-version=2018-06-30";
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mqttClient.setUsernamePassword(username, "");
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// Set the message callback, this function is
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// called when the MQTTClient receives a message
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mqttClient.onMessage(onMessageReceived);
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}
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void loop() {
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if (nbAccess.status() != NB_READY || gprs.status() != GPRS_READY) {
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connectNB();
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}
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if (!mqttClient.connected()) {
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// MQTT client is disconnected, connect
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connectMQTT();
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}
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// poll for new MQTT messages and send keep alives
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mqttClient.poll();
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// publish a message roughly every 5 seconds.
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if (millis() - lastMillis > 5000) {
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lastMillis = millis();
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publishMessage();
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}
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}
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unsigned long getTime() {
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// get the current time from the cellular module
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return nbAccess.getTime();
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}
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void connectNB() {
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Serial.println("Attempting to connect to the cellular network");
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while ((nbAccess.begin(pinnumber) != NB_READY) ||
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(gprs.attachGPRS() != GPRS_READY)) {
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// failed, retry
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Serial.print(".");
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delay(1000);
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}
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Serial.println("You're connected to the cellular network");
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Serial.println();
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}
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void connectMQTT() {
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Serial.print("Attempting to MQTT broker: ");
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Serial.print(broker);
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Serial.println(" ");
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while (!mqttClient.connect(broker, 8883)) {
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// failed, retry
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Serial.print(".");
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Serial.println(mqttClient.connectError());
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delay(5000);
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}
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Serial.println();
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Serial.println("You're connected to the MQTT broker");
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Serial.println();
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// subscribe to a topic
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mqttClient.subscribe("devices/" + deviceId + "/messages/devicebound/#");
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}
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void publishMessage() {
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Serial.println("Publishing message");
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// send message, the Print interface can be used to set the message contents
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mqttClient.beginMessage("devices/" + deviceId + "/messages/events/");
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mqttClient.print("hello ");
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mqttClient.print(millis());
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mqttClient.endMessage();
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}
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void onMessageReceived(int messageSize) {
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// we received a message, print out the topic and contents
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Serial.print("Received a message with topic '");
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Serial.print(mqttClient.messageTopic());
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Serial.print("', length ");
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Serial.print(messageSize);
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Serial.println(" bytes:");
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// use the Stream interface to print the contents
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while (mqttClient.available()) {
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Serial.print((char)mqttClient.read());
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}
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Serial.println();
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Serial.println();
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}

‎examples/Azure IoT Hub/Azure_IoT_Hub_NB/arduino_secrets.h

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// NB settings
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#define SECRET_PINNUMBER ""
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// Fill in the hostname of your Azure IoT Hub broker
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#define SECRET_BROKER "<hub name>.azure-devices.net"
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// Fill in the device id
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#define SECRET_DEVICE_ID "<device id>"

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