IOT_ESP8266.c

#include <ESP8266WiFiMulti.h>
#include <ESP8266HTTPClient.h>
#include <ArduinoJson.h>
#include <vector>

// WIfi Multi
ESP8266WiFiMulti WiFiMulti;

// GPIO init
const int pinOutput[] = { D2,D3,D4,D5,D6,D7,D8,D9,D10 };
typedef std::vector<int> data_signal;
int countPin = 0;

void setup()
{
    Serial.begin(115200);

    // set Wifi SSID dan passwordnya
    WiFiMulti.addAP("SSID_1", "password_1");
    WiFiMulti.addAP("SSID_2", "password_2");

    // GPIO set OUTPUT
    countPin = (sizeof(pinOutput)/sizeof(*pinOutput));
    for(int p = 0; p < countPin; p++)
      pinMode(pinOutput[p], OUTPUT);
 }

/**
 * Untuk parsing data string
 */
 void parseAndExecData(char * data) {
    // Vector
   data_signal ds;
  
   const char s[2] = "-";
   char *token = strtok(data, s);
   Serial.print("Debug TOKEN => ");
   
   /* walk through other tokens */
   while( token != NULL ) 
   {
      // Konversi char ke integer
      int j = atoi(token);
      // Add to vector
      ds.push_back(j);
      token = strtok(NULL, s);
   }

    Serial.print("Debug size token => ");
    Serial.print(ds.size());

    printf("\n");
    Serial.print("Debug Data => ");

    // Iterasi
    data_signal::iterator iter;

    // Periksa apakah total data sudah sama
    // dengan total pin ?
    if(countPin == ds.size()) {
      int index = 0;
      for (iter = ds.begin(); iter != ds.end(); ++iter) {
         
         // Debug iterasi
         printf("%d ", *iter);

         // GPIO = 1 (hidup)
         if(*iter == 0)
             digitalWrite(pinOutput[index],LOW);

         // GPIO = 1 (mati)
         if(*iter == 1)
             digitalWrite(pinOutput[index],HIGH);
         
         index++;
      }
    }

   printf("\n");
   
 }

/**
 * Untuk parsing JSON
 **/
 char * parseJson (String json) {
    StaticJsonBuffer<200> jsonBuffer;
    JsonObject& root = jsonBuffer.parseObject(json);
    if (!root.success()){
      Serial.printf("parseObject() failed\n");
      return NULL;
    } 

    // Get value
    const char * value = root["value"];
    char * data =  const_cast<char*>(value);

    // Not use
    // Get error code
    int code = root["code"];

    return data;
 }

/**
 * Untuk periksa web service agnosthing 
 **/
 void HTTPSwitchCheck(String url, const int gate[]) {
    HTTPClient http;

    // Storage anti drop
    static String json;
    
    // ganti dengan URL API Last Feed punyamu sendiri
    http.begin(url);

    // mulai koneksi dan ambil HTTP Header
    int httpCode = http.GET();

    // httpCode akan bernilai negatif bila error
    if(httpCode > 0)
    {
        // cetak httpCode ke Serial
        Serial.printf("[HTTP] GET... code: %d\n", httpCode);

        // bila nilai dari server diterima
        if(httpCode == HTTP_CODE_OK)
        {
            // cetak string json dari server
            json = http.getString();
        }

    } else {
        Serial.printf("[HTTP] GET... failed, error: %s\n", http.errorToString(httpCode).c_str());
    }
    
    // tutup koneksi HTTP
    http.end();

    // Debug
    Serial.print("Debug JSON => ");
    Serial.println(json);

    char* data = parseJson(json);
    parseAndExecData(data);
 }

void loop()
{
    // tunggu koneksi Wifi
    if((WiFiMulti.run() == WL_CONNECTED))
    {
        Serial.printf("Succesfully Connected Wifi\n");
        HTTPSwitchCheck("http://agnosthings.com/88bXXXXX-117c-XXXX-XXXX-0050568XXXXX/field/last/feed/255/switch",pinOutput);
    } else {
      Serial.printf("Failed Connected Wifi\n");
    }

    delay(1000);
}