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139 lines
5.2 KiB
C++
139 lines
5.2 KiB
C++
#include <WiFi.h>
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#include <PubSubClient.h>
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#include <WiFiClientSecure.h>
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// WiFi credentials
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const char *ssid = "WIFI_SSID"; // Replace with your WiFi name
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const char *password = "WIFI_PASSWORD"; // Replace with your WiFi password
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// MQTT Broker settings
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const char *mqtt_broker = "broker.emqx.io";
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const char *mqtt_topic = "emqx/esp32";
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const char *mqtt_username = "emqx";
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const char *mqtt_password = "public";
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const int mqtt_port = 8883;
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// WiFi and MQTT client initialization
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WiFiClientSecure esp_client;
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PubSubClient mqtt_client(esp_client);
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// Root CA Certificate
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// Load DigiCert Global Root G2, which is used by EMQX Public Broker: broker.emqx.io
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const char *ca_cert = R"EOF(
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-----BEGIN CERTIFICATE-----
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MIIDjjCCAnagAwIBAgIQAzrx5qcRqaC7KGSxHQn65TANBgkqhkiG9w0BAQsFADBh
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MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3
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d3cuZGlnaWNlcnQuY29tMSAwHgYDVQQDExdEaWdpQ2VydCBHbG9iYWwgUm9vdCBH
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MjAeFw0xMzA4MDExMjAwMDBaFw0zODAxMTUxMjAwMDBaMGExCzAJBgNVBAYTAlVT
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MRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5j
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b20xIDAeBgNVBAMTF0RpZ2lDZXJ0IEdsb2JhbCBSb290IEcyMIIBIjANBgkqhkiG
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9w0BAQEFAAOCAQ8AMIIBCgKCAQEAuzfNNNx7a8myaJCtSnX/RrohCgiN9RlUyfuI
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2/Ou8jqJkTx65qsGGmvPrC3oXgkkRLpimn7Wo6h+4FR1IAWsULecYxpsMNzaHxmx
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1x7e/dfgy5SDN67sH0NO3Xss0r0upS/kqbitOtSZpLYl6ZtrAGCSYP9PIUkY92eQ
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q2EGnI/yuum06ZIya7XzV+hdG82MHauVBJVJ8zUtluNJbd134/tJS7SsVQepj5Wz
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tCO7TG1F8PapspUwtP1MVYwnSlcUfIKdzXOS0xZKBgyMUNGPHgm+F6HmIcr9g+UQ
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vIOlCsRnKPZzFBQ9RnbDhxSJITRNrw9FDKZJobq7nMWxM4MphQIDAQABo0IwQDAP
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BgNVHRMBAf8EBTADAQH/MA4GA1UdDwEB/wQEAwIBhjAdBgNVHQ4EFgQUTiJUIBiV
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5uNu5g/6+rkS7QYXjzkwDQYJKoZIhvcNAQELBQADggEBAGBnKJRvDkhj6zHd6mcY
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1Yl9PMWLSn/pvtsrF9+wX3N3KjITOYFnQoQj8kVnNeyIv/iPsGEMNKSuIEyExtv4
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NeF22d+mQrvHRAiGfzZ0JFrabA0UWTW98kndth/Jsw1HKj2ZL7tcu7XUIOGZX1NG
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Fdtom/DzMNU+MeKNhJ7jitralj41E6Vf8PlwUHBHQRFXGU7Aj64GxJUTFy8bJZ91
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8rGOmaFvE7FBcf6IKshPECBV1/MUReXgRPTqh5Uykw7+U0b6LJ3/iyK5S9kJRaTe
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pLiaWN0bfVKfjllDiIGknibVb63dDcY3fe0Dkhvld1927jyNxF1WW6LZZm6zNTfl
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MrY=
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-----END CERTIFICATE-----
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)EOF";
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// Load DigiCert Global Root CA ca_cert, which is used by EMQX Cloud Serverless Deployment
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/*
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const char* ca_cert = R"EOF(
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-----BEGIN CERTIFICATE-----
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MIIDrzCCApegAwIBAgIQCDvgVpBCRrGhdWrJWZHHSjANBgkqhkiG9w0BAQUFADBh
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MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3
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d3cuZGlnaWNlcnQuY29tMSAwHgYDVQQDExdEaWdpQ2VydCBHbG9iYWwgUm9vdCBD
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QTAeFw0wNjExMTAwMDAwMDBaFw0zMTExMTAwMDAwMDBaMGExCzAJBgNVBAYTAlVT
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MRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5j
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b20xIDAeBgNVBAMTF0RpZ2lDZXJ0IEdsb2JhbCBSb290IENBMIIBIjANBgkqhkiG
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9w0BAQEFAAOCAQ8AMIIBCgKCAQEA4jvhEXLeqKTTo1eqUKKPC3eQyaKl7hLOllsB
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CSDMAZOnTjC3U/dDxGkAV53ijSLdhwZAAIEJzs4bg7/fzTtxRuLWZscFs3YnFo97
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nh6Vfe63SKMI2tavegw5BmV/Sl0fvBf4q77uKNd0f3p4mVmFaG5cIzJLv07A6Fpt
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43C/dxC//AH2hdmoRBBYMql1GNXRor5H4idq9Joz+EkIYIvUX7Q6hL+hqkpMfT7P
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T19sdl6gSzeRntwi5m3OFBqOasv+zbMUZBfHWymeMr/y7vrTC0LUq7dBMtoM1O/4
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gdW7jVg/tRvoSSiicNoxBN33shbyTApOB6jtSj1etX+jkMOvJwIDAQABo2MwYTAO
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BgNVHQ8BAf8EBAMCAYYwDwYDVR0TAQH/BAUwAwEB/zAdBgNVHQ4EFgQUA95QNVbR
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TLtm8KPiGxvDl7I90VUwHwYDVR0jBBgwFoAUA95QNVbRTLtm8KPiGxvDl7I90VUw
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DQYJKoZIhvcNAQEFBQADggEBAMucN6pIExIK+t1EnE9SsPTfrgT1eXkIoyQY/Esr
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hMAtudXH/vTBH1jLuG2cenTnmCmrEbXjcKChzUyImZOMkXDiqw8cvpOp/2PV5Adg
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06O/nVsJ8dWO41P0jmP6P6fbtGbfYmbW0W5BjfIttep3Sp+dWOIrWcBAI+0tKIJF
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PnlUkiaY4IBIqDfv8NZ5YBberOgOzW6sRBc4L0na4UU+Krk2U886UAb3LujEV0ls
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YSEY1QSteDwsOoBrp+uvFRTp2InBuThs4pFsiv9kuXclVzDAGySj4dzp30d8tbQk
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CAUw7C29C79Fv1C5qfPrmAESrciIxpg0X40KPMbp1ZWVbd4=
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-----END CERTIFICATE-----
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*/
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// Function Declarations
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void connectToWiFi();
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void connectToMQTT();
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void mqttCallback(char *topic, byte *payload, unsigned int length);
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void setup() {
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Serial.begin(115200);
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connectToWiFi();
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// Set Root CA certificate
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esp_client.setCACert(ca_cert);
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mqtt_client.setServer(mqtt_broker, mqtt_port);
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mqtt_client.setKeepAlive(60);
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mqtt_client.setCallback(mqttCallback);
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connectToMQTT();
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}
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void connectToWiFi() {
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WiFi.begin(ssid, password);
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Serial.print("Connecting to WiFi");
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while (WiFi.status() != WL_CONNECTED) {
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delay(500);
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Serial.print(".");
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}
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Serial.println("\nConnected to WiFi");
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}
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void connectToMQTT() {
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while (!mqtt_client.connected()) {
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String client_id = "esp32-client-" + String(WiFi.macAddress());
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Serial.printf("Connecting to MQTT Broker as %s...\n", client_id.c_str());
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if (mqtt_client.connect(client_id.c_str(), mqtt_username, mqtt_password)) {
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Serial.println("Connected to MQTT broker");
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mqtt_client.subscribe(mqtt_topic);
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mqtt_client.publish(mqtt_topic, "Hi EMQX I'm ESP32 ^^"); // Publish message upon connection
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} else {
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Serial.print("Failed to connect to MQTT broker, rc=");
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Serial.print(mqtt_client.state());
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Serial.println(" Retrying in 5 seconds.");
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delay(5000);
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}
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}
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}
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void mqttCallback(char *topic, byte *payload, unsigned int length) {
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Serial.print("Message received on topic: ");
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Serial.println(topic);
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Serial.print("Message: ");
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for (unsigned int i = 0; i < length; i++) {
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Serial.print((char) payload[i]);
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}
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Serial.println("\n-----------------------");
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}
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void loop() {
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if (!mqtt_client.connected()) {
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connectToMQTT();
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}
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mqtt_client.loop();
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} |