공공데이터 미세먼지 구현 esp32 코드

#include <WiFi.h>

#include <time.h>

const char* ssid = "iot2024";          // WiFi 네트워크 이름(SSID) 입력

const char* password = "a123456789";  // WiFi 네트워크 비밀번호 입력

const int httpPort = 80;

const char* apiKey = "lDEdd33YlrBTh3cK%2BWHVYFP1Yc6UviDPFZP%2BVRcFaSqFtzZs7W%2BMXx5wmG1J08ejVd5nmwPQ15qDQmEXbKPqvg%3D%3D";

const char* version = "&ver=1.0";

const char* server = "apis.data.go.kr";

const char* stationName = "산격동";  //지명

const char* returnType = "xml";

const char* numOfRows = "1";

const char* pageNo = "1";

const char* dataTerm = "DAILY";

WiFiClient client;

void setup() {

  Serial.begin(115200);

  WiFi.mode(WIFI_STA);

  WiFi.begin(ssid, password);

  Serial.println("\nConnecting to WiFi");

  while (WiFi.status() != WL_CONNECTED) {

    Serial.print(".");

    delay(1000);

  }

  Serial.println("");

  Serial.print("Connected to WiFi network with IP Address: ");

  Serial.println(WiFi.localIP());

}

void loop() {

  String a[3];

  int i = 0;

  String dateNtime;

  String pm10Val;

  String pm10Grade;

  String tmp_str;

  static int IntervalReq = 600;  

  if (IntervalReq++ >= 600) {  //600초 간격으로 data요청

    IntervalReq = 0;

    Requesthttp();

  }

  delay(50);

  while (client.available()) {

    String line = client.readStringUntil('\n');

    Serial.println(line);

  }

  delay(1000);

}

void Requesthttp() {

  if (client.connect(server, httpPort)) {

    Serial.println("\nSuccessed connection, and request http protocol");

    client.print(String("Get /B552584/ArpltnInforInqireSvc"));

    client.print(String("/getMsrstnAcctoRltmMesureDnsty?serviceKey="));

    client.print(String(apiKey));

    client.print(String("&returnType=") + String(returnType));

    client.print(String("&numOfRows=") + String(numOfRows));

    client.print(String("&pageNo=") + String(pageNo));

    client.print(String("&stationName=") + urlencode(String(stationName)));

    client.print(String("&dataTerm=") + String(dataTerm));

    client.print(String(version));

    client.print(String(" HTTP/1.1\r\n"));

    client.print(String("Host: ") + String(server) + String("\r\n"));

    client.print(String("Connection: close\r\n"));

    client.print(String("\r\n\r\n"));

  } else {

    Serial.println("\nfailed connection");

  }

}

String urlencode(String str) {

  String encodedString = "";

  char c;

  char code0;

  char code1;

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

    c = str.charAt(i);

    if (c == ' ') {

      encodedString += '+';

    } else if (isalnum(c)) {

      encodedString += c;

    } else {

      code1 = (c & 0xf) + '0';

      if ((c & 0xf) > 9) {

        code1 = (c & 0xf) - 10 + 'A';

      }

      c = (c >> 4) & 0xf;

      code0 = c + '0';

      if (c > 9) {

        code0 = c - 10 + 'A';

      }

      encodedString += '%';

      encodedString += code0;

      encodedString += code1;

    }

  }

  return encodedString;

}