arduino 8266 mqqt代码
时间: 2023-07-09 20:39:07 浏览: 55
以下是一个基本的 Arduino 8266 MQTT 代码示例:
```cpp
#include <ESP8266WiFi.h>
#include <PubSubClient.h>
const char* ssid = "your_SSID";
const char* password = "your_PASSWORD";
const char* mqtt_server = "your_MQTT_SERVER";
const char* mqtt_username = "your_MQTT_USERNAME";
const char* mqtt_password = "your_MQTT_PASSWORD";
WiFiClient espClient;
PubSubClient client(espClient);
void setup() {
Serial.begin(9600);
delay(10);
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()) {
Serial.println("Connecting to MQTT server...");
if (client.connect("ESP8266Client", mqtt_username, mqtt_password)) {
Serial.println("Connected to MQTT server");
client.subscribe("test");
} else {
Serial.print("Failed, 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: ");
Serial.println(topic);
Serial.print("Payload: ");
for (int i = 0; i < length; i++) {
Serial.print((char)payload[i]);
}
Serial.println();
}
void reconnect() {
while (!client.connected()) {
Serial.println("Connecting to MQTT server...");
if (client.connect("ESP8266Client", mqtt_username, mqtt_password)) {
Serial.println("Connected to MQTT server");
client.subscribe("test");
} else {
Serial.print("Failed, rc=");
Serial.print(client.state());
Serial.println(" retrying in 5 seconds");
delay(5000);
}
}
}
```
这个示例连接到 Wi-Fi,然后连接到指定的 MQTT 服务器,并订阅 "test" 主题。它会持续接收来自服务器的消息。在这个示例中,我们使用了 PubSubClient 类来处理 MQTT 连接和通信。注意,你需要在你的 Arduino 8266 上安装 PubSubClient 库。
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