/*

 Basic ESP8266 MQTT example

 This sketch demonstrates the capabilities of the pubsub library in combination

 with the ESP8266 board/library.

 It connects to an MQTT server then:

  - publishes "hello world" to the topic "outTopic" every two seconds

  - subscribes to the topic "inTopic", printing out any messages

    it receives. NB - it assumes the received payloads are strings not binary

  - If the first character of the topic "inTopic" is an 1, switch ON the ESP Led,

    else switch it off

 It will reconnect to the server if the connection is lost using a blocking

 reconnect function. See the 'mqtt_reconnect_nonblocking' example for how to

 achieve the same result without blocking the main loop.

 To install the ESP8266 board, (using Arduino 1.6.4+):

  - Add the following 3rd party board manager under "File -> Preferences -> Additional Boards Manager URLs":

       http://arduino.esp8266.com/stable/package_esp8266com_index.json

  - Open the "Tools -> Board -> Board Manager" and click install for the ESP8266"

  - Select your ESP8266 in "Tools -> Board"

*/

//改为<WiFi.h>

#include <WiFi.h>

#include <PubSubClient.h>

#include <ArduinoJson.h>

//#define BUILTIN_LED 2

// Update these with values suitable for your network.

const char* ssid = "热点ssid";

const char* password = "连接密码";

const char* mqtt_server = "183.230.40.39";

WiFiClient espClient;

PubSubClient client(espClient);

long lastMsg = 0;

char msg_buf[200];

int value = 0;  //

//char one_type3_header[] = {'0x03','0x00','0x46'};

char dataTemplete[]="{"temperature":25.5,"time":%d}";

char msgJson[75];

char debug_buf[200];

int i;

unsigned short json_len=0;

uint8_t* packet_p;

uint8_t debug_buffer_start_index = 0;

void setup_wifi() {

  delay(10);

  // We start by connecting to a WiFi network

  Serial.println();

  Serial.print("Connecting to ");

  Serial.println(ssid);

  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("] ");

  for (int i = 0; i < length; i++) {

    Serial.print((char)payload[i]);

  }

  Serial.println();

  // Switch on the LED if an 1 was received as first character

  if ((char)payload[0] == '1') {

    digitalWrite(BUILTIN_LED, LOW);   // Turn the LED on (Note that LOW is the voltage level

    // but actually the LED is on; this is because

    // it is active low on the ESP-01)

  } else {

    digitalWrite(BUILTIN_LED, HIGH);  // Turn the LED off by making the voltage HIGH

  }

}

void reconnect() {

  // Loop until we're reconnected

  while (!client.connected()) {

    Serial.print("Attempting MQTT connection...");

    // Create a random client ID

    //String clientId = "设备_id";

    //clientId += String(random(0xffff), HEX);

    // Attempt to connect

    if (client.connect("设备id","产品_id","API_key")) {  //One net user name as product ID , and password as APIKey

      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 setup() {

  pinMode(BUILTIN_LED, OUTPUT);     // Initialize the BUILTIN_LED pin as an output, where do it esp32 get gpio2 as led

  Serial.begin(115200);

  setup_wifi();

  client.setServer(mqtt_server, 6002);  //not 1883 , one net use the port of 6002 as mqtt server

  client.connect("设备Id","产品id","API_key");

  client.setCallback(callback);

}

void loop() {

  if (!client.connected()) {

    reconnect();

  }

  client.loop();

  long now = millis();

  if (now - lastMsg > 2000) {

    lastMsg = now;

    ++value;

    //snprintf (msgJson, 75, "hello world #%ld", value);

    snprintf(msgJson,40,dataTemplete,22);

    json_len=strlen(msgJson); //packet length count the end char '\0'

    msg_buf[0]=char(0x03);  //palyLoad packet byte 1, one_net mqtt Publish packet payload byte 1, type3 , json type2

    msg_buf[1]=char(json_len>>8);  //high 8 bits of json_len (16bits as short int type)

    msg_buf[2]=char(json_len&0xff); //low 8 bits of json_len (16bits as short int type)

   // snprintf(msg_buf+3,40,dataTemplete,value);

   memcpy(msg_buf+3,msgJson,strlen(msgJson));

   msg_buf[3+strlen(msgJson)] = 0;

    Serial.print("Publish message: ");

    Serial.println(msgJson);

    client.publish("$dp",msg_buf,3+strlen(msgJson),false); // msg_buf as payload length which may have a "0x00"byte

    //debug one_net packet

    packet_p = client.getBufferPointer();

    for(i = 0 ; i< 200;i++)

    {

     //sprintf(debug_buf,"0x%02x ",msg_buf[i]);

     sprintf(debug_buf,"0x%02x ",packet_p[i]);

     Serial.print(debug_buf);

    }

    Serial.println();

    for(i = 0 ; i< 200;i++)

    {

     sprintf(debug_buf,"0x%02x ",msg_buf[i]);

     //sprintf(debug_buf,"0x%02x ",packet_p[i]);

     Serial.print(debug_buf);

    }

    Serial.println();

    debug_buffer_start_index=client.getDebugVar();

    Serial.println(debug_buffer_start_index);

  }

}