Arduino MQTT代码在几个小时后停止工作
为ArduinoIDE中的节点MCU编写了一些代码,以使用MQTT按下按钮。代码在一段时间内运行良好,但几个小时后它将不再响应 代码是非常弗兰肯斯坦的,因为我是一个超级新手,代码如下:Arduino MQTT代码在几个小时后停止工作,arduino,mqtt,esp8266,nodemcu,servo,Arduino,Mqtt,Esp8266,Nodemcu,Servo,为ArduinoIDE中的节点MCU编写了一些代码,以使用MQTT按下按钮。代码在一段时间内运行良好,但几个小时后它将不再响应 代码是非常弗兰肯斯坦的,因为我是一个超级新手,代码如下: #include <ESP8266WiFi.h> #include <PubSubClient.h> #include <Servo.h> const char* ssid = "ap_name"; //change const char* password = "ap_p
#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();
}
有人知道是什么原因导致它停止工作吗 这可能是因为,如果客户端断开连接,您永远不会重新连接 有关更多详细信息,请参见示例,下面是示例中的reconnect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){
...
}
在开始查看有效负载之前,您应该检查主题是否是您感兴趣的实际主题,长度是否也是您期望的长度。非常感谢您注意到这一点!将修改代码并立即进行测试。我一有话要说就回去报到。