How to connect Azure IoT Hub with MQTT-TLS

Cloud Integrations
1

Hi guys,

Some developer ask to me “How to connect to the Azure IoT Hub with MQTT-TLS”, because of Google IoT core ended.

So I we will guide How do we connect to the Azure IoT Hub on this topic.

  • enviroment
    Particle Argon(I tested firmware version 5.1.0).
    MQTT-TLS 0.2.25
3 Likes
3
  • sample source code is here
    “demomqttparticle” is my test Azure IoT Hub(already deleted from my Azure), use your own Azure IoT Hub.
#include "MQTT-TLS.h"

#define AZURE_IOT_HUB_ROOT_CA_PEM                                       \
"------BEGIN CERTIFICATE----- \r\n"                                     \
"MIIDdzCCAl+gAwIBAgIEAgAAuTANBgkqhkiG9w0BAQUFADBaMQswCQYDVQQGEwJJ\r\n"  \
"RTESMBAGA1UEChMJQmFsdGltb3JlMRMwEQYDVQQLEwpDeWJlclRydXN0MSIwIAYD\r\n"  \
"VQQDExlCYWx0aW1vcmUgQ3liZXJUcnVzdCBSb290MB4XDTAwMDUxMjE4NDYwMFoX\r\n"  \
"DTI1MDUxMjIzNTkwMFowWjELMAkGA1UEBhMCSUUxEjAQBgNVBAoTCUJhbHRpbW9y\r\n"  \
"ZTETMBEGA1UECxMKQ3liZXJUcnVzdDEiMCAGA1UEAxMZQmFsdGltb3JlIEN5YmVy\r\n"  \
"VHJ1c3QgUm9vdDCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAKMEuyKr\r\n"  \
"mD1X6CZymrV51Cni4eiVgLGw41uOKymaZN+hXe2wCQVt2yguzmKiYv60iNoS6zjr\r\n"  \
"IZ3AQSsBUnuId9Mcj8e6uYi1agnnc+gRQKfRzMpijS3ljwumUNKoUMMo6vWrJYeK\r\n"  \
"mpYcqWe4PwzV9/lSEy/CG9VwcPCPwBLKBsua4dnKM3p31vjsufFoREJIE9LAwqSu\r\n"  \
"XmD+tqYF/LTdB1kC1FkYmGP1pWPgkAx9XbIGevOF6uvUA65ehD5f/xXtabz5OTZy\r\n"  \
"dc93Uk3zyZAsuT3lySNTPx8kmCFcB5kpvcY67Oduhjprl3RjM71oGDHweI12v/ye\r\n"  \
"jl0qhqdNkNwnGjkCAwEAAaNFMEMwHQYDVR0OBBYEFOWdWTCCR1jMrPoIVDaGezq1\r\n"  \
"BE3wMBIGA1UdEwEB/wQIMAYBAf8CAQMwDgYDVR0PAQH/BAQDAgEGMA0GCSqGSIb3\r\n"  \
"DQEBBQUAA4IBAQCFDF2O5G9RaEIFoN27TyclhAO992T9Ldcw46QQF+vaKSm2eT92\r\n"  \
"9hkTI7gQCvlYpNRhcL0EYWoSihfVCr3FvDB81ukMJY2GQE/szKN+OMY3EU/t3Wgx\r\n"  \
"jkzSswF07r51XgdIGn9w/xZchMB5hbgF/X++ZRGjD8ACtPhSNzkE1akxehi/oCr0\r\n"  \
"Epn3o0WC4zxe9Z2etciefC7IpJ5OCBRLbf1wbWsaY71k5h+3zvDyny67G7fyUIhz\r\n"  \
"ksLi4xaNmjICq44Y3ekQEe5+NauQrz4wlHrQMz2nZQ/1/I6eYs9HRCwBXbsdtTLS\r\n"  \
"R9I4LtD+gdwyah617jzV/OeBHRnDJELqYzmp\r\n"  \
"-----END CERTIFICATE-----\r\n" 
const char azureIoTHubRootCaPem[] = AZURE_IOT_HUB_ROOT_CA_PEM;

MQTT client("demomqttparticle.azure-devices.net", 8883, callback);

// recieve message
void callback(char* topic, byte* payload, unsigned int length) {
    Serial.write(payload, length);
    Serial.print(":");
    Serial.println(length);
    if (strncmp("RED", (const char*)payload, strlen("RED")) == 0)
        RGB.color(255, 0, 0);
    else if (strncmp("GREEN", (const char*)payload, strlen("GREEN")) == 0)
        RGB.color(0, 255, 0);
    else if (strncmp("BLUE", (const char*)payload, strlen("BLUE")) == 0)
        RGB.color(0, 0, 255);
    else {
        RGB.color(255, 255, 255);
    }
    delay(1000);
}

#define ONE_DAY_MILLIS (24 * 60 * 60 * 1000)
unsigned long lastSync = millis();
void setup() {
    if (millis() - lastSync > ONE_DAY_MILLIS) {
        Particle.syncTime();
        lastSync = millis();
    }

    RGB.control(true);

    // enable tls. set Root CA pem, private key file.
    client.enableTls(azureIoTHubRootCaPem, sizeof(azureIoTHubRootCaPem));
    Serial.println("tls enable");

    // connect to the server
    client.connect("argondevice", "demomqttparticle.azure-devices.net/argondevice", "SharedAccessSignature sr=demomqttparticle.azure-devices.net%2Fdevices%2Fargondevice&sig=Y23brx8y%2B11QIgz2KpoEsmz0mEQgTjFTW8T7gypfTLM%3D&se=1668184617");

    // publish/subscribe
    if (client.isConnected()) {
        Serial.println("client connected");
        client.publish("devices/argondevice/messages/events/", "hello world");
        client.subscribe("devices/argondevice/messages/events/");
    }
}

int counter = 0;
void loop() {
    if (client.isConnected()) {
        client.loop();
    }
    delay(1000);
    counter += 1;
    client.publish("devices/argondevice/messages/events/", "hello world : " + String(counter));
}
1 Like
4
  • build app on VScode
    Please check this youtube video.
    The points are the device name setting and the SAS token.(install Azure IoT Tools Extension to VScode).
    After settings and flash apps, will find publish data on Azure Monitoring.

Good luck.

1 Like
5

Wow, this is a great tutorial. Thanks @hirotakaster!

1 Like
6

This is an excellent resource and very clearly laid out @hirotakaster. I’m presently updating our code to migrate from Google to Azure and have some small variations from the example framework (E-series and MQTT-TLS config changes). I’ll follow this topic as I work through the changes and update this thread with any nuances I find on the E-series. Hope to get this working quickly!

3 Likes