esp8266/esp12f安装MQTT Client 客户端

esp8266/esp12f安装MQTT Client 客户端

代码我已经写好了，由于只有一个esp12f，发布和订阅用的是一个模块。

#include <ESP8266WiFi.h>
#include <PubSubClient.h>
WiFiClient espClient;
PubSubClient client(espClient);
// Update these with values suitable for your network.
const char* ssid = "replace with your ssid";
const char* password = "replace with ssid's password";
const char* mqtt_server = "ip address of mqtt server";
unsigned long lastMsg = 0;
char msg[50];
int light=2;
void setup_wifi() {

  delay(10);
  // We start by connecting to a WiFi network
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  randomSeed(micros());
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

void callback(char* topic, byte* payload, unsigned int length) {
  Serial.print("Message arrived [");
  Serial.print(topic);
  Serial.print("] ");
  char msg[8]={};
  for (int i = 0; i < length; i++) {
    msg[i]=(char)payload[i];
    Serial.print(msg[i]);
  }
  Serial.println();

  // use function to control led with value that had received.if you have not rod,disnable
  //this function
  driveled_pwm(msg);
}

int driveled_pwm(char msg[4]){
  int lightpin=2;
  pinMode(lightpin,OUTPUT);
  int brightness=atoi(msg);
  analogWrite(lightpin, brightness);
  }

int msg_pub(){
  int sensorpin=A0;
  pinMode(A0,INPUT);
  int drive=analogRead(sensorpin);
  return drive;
  }
void setup() {
  Serial.begin(115200);
  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
}
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("light", "1024");
      // ... and resubscribe
      client.subscribe("light");
    } 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();
  unsigned long now = millis();
  //you can chang the inteval to what you want speed
  if (now - lastMsg > 200) {
    lastMsg = now;
    //used value anologread from A0,you can give a const value,max 1024,min 0
    char a[4];
    const char* pubmsg=itoa(msg_pub(), a,10);
    client.publish("light", pubmsg);
  }
}
`
代码安装在ESP12F上能正常与MOSQUITTO正常连接``