使用 Arduino Uno 与MQTT，echarts，java自己手动撸一个IOT平台

程序初始化自定义信息列表：
1、网卡MAC地址：mac
 2、 IP:ip
3、服务器地址:localserver
4、AES密钥：uint8_t key
5、MQTT验证用户名：username
6、MQTT验证密码：password

系统变量：
1、DHT11感应器：DHT11
2、获取DHT11感应器 的实时数据函数：getData()
3、将获取的数据拼接成json字符串函数：buildJson()
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#include <SPI.h>
#include <Ethernet.h>
#include <PubSubClient.h>
#include <dht11.h>
#include <AESLib.h>

// MAC address
byte mac[]    = {0xDE, 0xED, 0xBA, 0xFE, 0xFE, 0x4D };
char macstr[] = "deedbafefeed";
// local MQTT server
byte localserver[] = {192, 168, 1, 5 };
//  IP
byte ip[]     = {192, 168, 1, 22 };

String clientName = String("Arduino:") + macstr;
uint8_t key[] = {0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5};
char username[]="test";
char password[]="test";

void callback(char* topic, byte* payload, unsigned int length);
dht11 DHT11;
float tempF = 0.0;
float tempC = 0.0;
float humidity = 0.0;

unsigned long time = 0;

EthernetClient ethClient;

PubSubClient client(localserver, 8088, 0, ethClient);

void setup()
{

  // Start the ethernet client, open up serial port for debugging, and attach the DHT11 sensor
  Ethernet.begin(mac, ip);
  Serial.begin(9600);
  DHT11.attach(3);

}
void getData() {
  int chk = DHT11.read();
  switch (chk)
  {
  case 0:
    Serial.println("Read OK");
    humidity = (float)DHT11.humidity;
    tempF = DHT11.fahrenheit();
    tempC = DHT11.temperature;
    break;
  case -1:
    Serial.println("Checksum error");
    break;
  case -2:
    Serial.println("Time out error");
    break;
  default:
    Serial.println("Unknown error");
    break;
  }
}

String buildJson() {
  String data = "{";
  data+="\n";
  data+="\"temperatureF\": ";
  data+=(int)tempF;
  data+= ",";
  data+="\n";
  data+="\"temperatureC\": ";
  data+=(int)tempC;
  data+= ",";
  data+="\n";
  data+="\"humidity\": ";
  data+=(int)humidity;
  data+="\n";
  data+="}";
  //data+="\n";
  //data+="}";
  return data;
}

void loop()
{
  char clientStr[29];
  clientName.toCharArray(clientStr,29);
  char topicStr[26];
  getData();
  if (!client.connected()) {
    Serial.print("Trying to connect to: ");
    Serial.println(clientStr);

    aes128_enc_single(key,username);
    aes128_enc_single(key, password);
    client.connect(clientStr,username,password);

  }
  if (client.connected()) {
     client.subscribe ("test", 0);
     String json = buildJson();
    char jsonStr[200];
    json.toCharArray(jsonStr,200);
   boolean pubresult = client.publish("test",jsonStr);
    Serial.print("attempt to send ");
    Serial.println(jsonStr);
    Serial.print("to ");
    Serial.println(topicStr);
    if(pubresult)
     Serial.println("successfully sent");
     else
      Serial.println("unsuccessfully sent");

  }
  delay(20000);
}
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