使用公网IP和SSL将ESP32连接到MQTT服务器的步骤如下:
#include <WiFi.h>
#include <PubSubClient.h>
const char* ssid = "your_SSID";
const char* password = "your_PASSWORD";
const char* mqttServer = "your_MQTT_SERVER_IP";
const int mqttPort = 8883;
const char* mqttUser = "your_MQTT_USERNAME";
const char* mqttPassword = "your_MQTT_PASSWORD";
WiFiClient espClient;
PubSubClient client(espClient);
void setup() {
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(1000);
Serial.println("Connecting to WiFi...");
}
Serial.println("Connected to WiFi");
client.setServer(mqttServer, mqttPort);
client.setCallback(callback);
while (!client.connected()) {
if (client.connect("ESP32Client", mqttUser, mqttPassword )) {
Serial.println("Connected to MQTT server");
} else {
Serial.print("Failed to connect to MQTT server, rc=");
Serial.print(client.state());
Serial.println(" retrying in 5 seconds");
delay(5000);
}
}
client.subscribe("your_topic");
}
void loop() {
client.loop();
}
void callback(char* topic, byte* payload, unsigned int length) {
// 处理接收到的消息
}
在代码中,你需要替换以下参数:
const char* rootCACertificate = \
"-----BEGIN CERTIFICATE-----\n" \
"YOUR_ROOT_CA_CERTIFICATE\n" \
"-----END CERTIFICATE-----\n";
client.setCACert(rootCACertificate);
将YOUR_ROOT_CA_CERTIFICATE替换为你的根证书内容。
callback
函数中处理接收到的消息。请注意,以上代码仅为示例,你可能需要根据你的具体情况进行适当的修改。
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