MQTT 代码在几个小时后停止工作

Question

为 Arduino 中的 NodeMCU 编写了一些代码 IDE 以使用 MQTT 按下按钮。该代码在一段时间内运行良好，但几个小时后它就不再响应了。

代码很科学怪人，本人是大菜鸟，代码如下：

#include <ESP8266WiFi.h>
#include <PubSubClient.h>
#include <Servo.h>

const char* ssid = "ap_name"; //change
const char* password =  "ap_pw"; //change
const char* mqttServer = "server_ip"; //change
const int mqttPort = 1883; 
const char* mqttUser = "server_name"; //change
const char* mqttPassword = "server_pw"; //change

WiFiClient espClient;
PubSubClient client(espClient);

Servo servo;

void setup() {
  Serial.begin(115200); 
  WiFi.begin(ssid, password);

  servo.attach(D4);
  servo.write(70);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.println("Connecting to WiFi..");
  }
  Serial.println("Connected to the WiFi network");

  client.setServer(mqttServer, mqttPort);
  client.setCallback(callback);

  while (!client.connected()) {
    Serial.println("Connecting to MQTT...");

    if (client.connect("ESP8266Client", mqttUser, mqttPassword )) {

      Serial.println("connected");  

    } else {

      Serial.print("failed with state ");
      Serial.print(client.state());
      delay(2000);

    }
  }

  client.publish("esp/test", "Hello from ESP8266");
  client.subscribe("esp/test");

}

void callback(char* topic, byte* payload, unsigned int length) {

  Serial.print("Message arrived in topic: ");
  Serial.println(topic);

  Serial.print("Message:");
  for (int i = 0; i < length; i++) {
    Serial.print((char)payload[i]);
  }

  if(*payload == 49){
    rotServo();
    Serial.println();
    Serial.print("Roterar servo");
    delay(3000);
    client.publish("esp/test", "0");
  }

  Serial.println();
  Serial.println("-----------------------");

}

void rotServo(){
  servo.attach(D4);
  servo.write(70);
  delay(1000);
  servo.write(175);
  delay(2000);
  servo.write(70);
  delay(3000);
  servo.detach();
}

void loop() {
  client.loop();
}

有谁知道可能导致它停止工作的原因吗？

Answer 1

这可能是因为，如果您的客户端断开连接，您将永远不会重新连接。

有关更多详细信息，请参阅示例 here，但这里是示例中的重新连接函数及其在循环中的调用方式。您需要对其进行定制以适合您的应用程序。

void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Create a random client ID
    String clientId = "ESP8266Client-";
    clientId += String(random(0xffff), HEX);
    // Attempt to connect
    if (client.connect(clientId.c_str())) {
      Serial.println("connected");
      // Once connected, publish an announcement...
      client.publish("outTopic", "hello world");
      // ... and resubscribe
      client.subscribe("inTopic");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}


void loop() {

  if (!client.connected()) {
    reconnect();
  }
  client.loop();
  ...
}

另一方面，虽然我认为这不会导致您的特定问题，但在您的回调中，您只需将有效负载的内容与数字 49 进行比较。

if(*payload == 49){
...
}

在开始查看负载之前，您应该检查该主题是否是您感兴趣的实际主题并且长度也是您所期望的。

MQTT 代码在几个小时后停止工作

MQTT code stops working after a couple of hours

arduino

mqtt

nodemcu

esp8266

servo