#include <ESP8266WiFi.h>
#include <PubSubClient.h>
#include "gpio.h"

// GPIO 5 D1
#define LED 4


// WiFi
const char *ssid = "Aspire_2.4"; // Enter your WiFi name
const char *password = "gzxnh112233!";  // Enter WiFi password

// MQTT Broker
const char *mqtt_broker = "rxqwkj.com";
const char *topic = "esp8266/led";
const char *mqtt_username = "admin";
const char *mqtt_password = "public";
const int mqtt_port = 1883;

WiFiClient espClient;
PubSubClient client(espClient);

void setup() {
   // Set software serial baud to 115200;
   Serial.begin(115200);
   // connecting to a WiFi network
   WiFi.begin(ssid, password);
   while (WiFi.status() != WL_CONNECTED) {
       delay(500);
       Serial.println("Connecting to WiFi..");
   }
   Serial.println("Connected to the WiFi network");
   //connecting to a mqtt broker
   client.setServer(mqtt_broker, mqtt_port);
   client.setCallback(callback);
   while (!client.connected()) {
       String client_id = "esp8266-client-";
       client_id += String(WiFi.macAddress());
       Serial.printf("The client %s connects to the public mqtt broker\n", client_id.c_str());
       if (client.connect(client_id.c_str(), mqtt_username, mqtt_password)) {
           Serial.println("Public emqx mqtt broker connected");
       } else {
           Serial.print("failed with state ");
           Serial.print(client.state());
           delay(2000);
       }
   }
   // publish and subscribe
   client.publish(topic, "hello emqx");
   client.subscribe(topic);
}

void callback(char *topic, byte *payload, unsigned int length) {
   Serial.print("Message arrived in topic: ");
   Serial.println(topic);
   Serial.print("Message:");
   String message;
   for (int i = 0; i < length; i++) {
       message = message + (char) payload[i];  // convert *byte to string
   }
   Serial.print(message);
   
   if (message == "off") {
    pinMode(LED, OUTPUT); //初始化PIN_LED引脚模式为输出
    digitalWrite(LED, LOW); 
    //gpio.write(LED, gpio.LOW)  
    }   
    // LED on
   if (message == "on") {
    pinMode(LED, OUTPUT); //初始化PIN_LED引脚模式为输出
    digitalWrite(LED, HIGH); 
    //gpio.write(LED, gpio.HIGH)  
    } 
    // LED off
   Serial.println();
   Serial.println("-----------------------");
}

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