http_get.ino

/*
 * AskSensors HTTP Request
 * Description: Connect ESP8266 to AskSensors over HTTP
 *  Author: https://asksensors.com, 2018-2019
 *  github: https://github.com/asksensors/AskSensors-ESP8266-API
 */

#include <Arduino.h>
#include <ESP8266WiFi.h>
#include <ESP8266WiFiMulti.h>
#include <ESP8266HTTPClient.h>

// user config: TODO
const char* wifi_ssid = "...................";             // SSID
const char* wifi_password = "...................";         // WIFI
const char* apiKeyIn = "...................";      // API KEY IN
const unsigned int writeInterval = 25000;   // write interval (in ms)

// ASKSENSORS config.
String host = "http://api.asksensors.com";         // ASKSENSORS API host name

ESP8266WiFiMulti WiFiMulti;

void setup() {

  Serial.begin(115200);
  Serial.println("*****************************************************");
  Serial.println("********** Program Start : Connect ESP8266 to AskSensors over HTTP");
  Serial.println("Wait for WiFi... ");
  Serial.print("********** connecting to WIFI : ");
  Serial.println(wifi_ssid);
  WiFi.begin(wifi_ssid, wifi_password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("-> WiFi connected");
  Serial.println("-> IP address: ");
  Serial.println(WiFi.localIP());
 
}


void loop() {
    // wait for WiFi connection
  if (WiFi.status() == WL_CONNECTED){

        HTTPClient http;

        Serial.print("[HTTP] begin...\n");
        
        // Create a URL for the request
        String url = "";
        url += host;
        url += "/write/";
        url += apiKeyIn;
        url += "?module1=";
        url += random(10,100);
        
        Serial.print("********** requesting URL: ");
        Serial.println(url);
        http.begin(url); //HTTP
        
        Serial.println("> Request sent to ASKSENSORS");

        Serial.print("[HTTP] GET...\n");
        // start connection and send HTTP header
        int httpCode = http.GET();

        // httpCode will be negative on error
        if(httpCode > 0) {
            // HTTP header has been send and Server response header has been handled
            Serial.printf("[HTTP] GET... code: %d\n", httpCode);

            // file found at server
            if(httpCode == HTTP_CODE_OK) {
                String payload = http.getString();
                Serial.println(payload);
            }
        } else {
            Serial.printf("[HTTP] GET... failed, error: %s\n", http.errorToString(httpCode).c_str());
        }

        http.end();

        Serial.println("********** End ");
        Serial.println("*****************************************************");
    }

    delay(writeInterval);   // wait for writeInterval
}