Wemos ESP8266 D1 Mini wi-fi example

esp8266-wifi.ino

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

const char* ssid = "YourWifiSSID";
const char* password = "YourWifiPassword";

// Set a user ID we want to fetch information from
uint16_t user_id = 1;

void setup () {
  Serial.begin(115200);
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.print("Connecting..");
  }

  Serial.println("success!");
  Serial.print("IP Address is: ");
  Serial.println(WiFi.localIP());
}

void loop() {
  // Check WiFi connection status
  if (WiFi.status() == WL_CONNECTED) {
    // Declare an object of class HTTPClient
    HTTPClient http;

    // Specify request destination
    String url = "http://jsonplaceholder.typicode.com/users/" + String(user_id);
    http.begin(url);
    
    // Send the request
    Serial.println("Request URL:" + url);
    int httpCode = http.GET();
    
    // Check the returning code
    if (httpCode > 0) {
      // Get the request response payload
      String payload = http.getString();
      // Print the response payload
      Serial.println(payload);

      // Increment user ID for next request
      user_id += 1;
    } else {
      Serial.print("Error: status code ");
      Serial.println(httpCode);
    }
    
    // Close connection
    http.end();
  }

  // Send a request every 30 seconds
  delay(30000);
}