mqtt与esp32通信
时间: 2023-05-11 18:05:06 浏览: 73
可以使用Arduino IDE中的PubSubClient库来实现MQTT与ESP32的通信。具体实现可以参考以下代码:
#include <WiFi.h>
#include <PubSubClient.h>
const char* ssid = "your_SSID";
const char* password = "your_PASSWORD";
const char* mqtt_server = "your_MQTT_SERVER";
WiFiClient espClient;
PubSubClient client(espClient);
void setup() {
Serial.begin(115200);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(1000);
Serial.println("Connecting to WiFi...");
}
Serial.println("Connected to WiFi");
client.setServer(mqtt_server, 1883);
client.setCallback(callback);
while (!client.connected()) {
if (client.connect("ESP32Client")) {
Serial.println("Connected to MQTT broker");
client.subscribe("test_topic");
} else {
Serial.print("Failed to connect to MQTT broker, rc=");
Serial.print(client.state());
Serial.println(" retrying in 5 seconds");
delay(5000);
}
}
}
void loop() {
if (!client.connected()) {
reconnect();
}
client.loop();
}
void callback(char* topic, byte* payload, unsigned int length) {
Serial.print("Message received on topic: ");
Serial.println(topic);
Serial.print("Message: ");
for (int i = 0; i < length; i++) {
Serial.print((char)payload[i]);
}
Serial.println();
}
void reconnect() {
while (!client.connected()) {
Serial.print("Attempting MQTT connection...");
if (client.connect("ESP32Client")) {
Serial.println("Connected to MQTT broker");
client.subscribe("test_topic");
} else {
Serial.print("Failed to connect to MQTT broker, rc=");
Serial.print(client.state());
Serial.println(" retrying in 5 seconds");
delay(5000);
}
}
}