esp

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

ESP8266WiFiMulti wifiMulti;

// REPLACE with your Domain name and URL path or IP address with path
const char* serverName = "http://*********************";

const uint32_t connectTimeoutMs = 5000;

String str;

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

  Serial.begin(115200);
  // Set in station mode
  WiFi.mode(WIFI_STA);

  // Register multi WiFi networks
  wifiMulti.addAP("1111", "pass11");
  wifiMulti.addAP("2222", "pass22");
  wifiMulti.addAP("3333", "pass33");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
}

void loop() {
  if (Serial.available()) {
    str = Serial.readString();

    //Check WiFi connection status
    if (wifiMulti.run(connectTimeoutMs) == WL_CONNECTED) {
      Serial.print("Connected ");
      Serial.println(WiFi.localIP());
      HTTPClient http;

      // Your Domain name with URL path or IP address with path
      http.begin(serverName);

      // Specify content-type header
      http.addHeader("Content-Type", "application/x-www-form-urlencoded");

      // Prepare your HTTP POST request data
      String httpRequestData = str;

      Serial.print("httpRequestData: ");
      Serial.println(httpRequestData);

      // Send HTTP POST request
      int httpResponseCode = http.POST(httpRequestData);

      if (httpResponseCode > 0) {
        Serial.print("HTTP Response code: ");
        Serial.println(httpResponseCode);
      }
      else {
        Serial.print("Error code: ");
        Serial.println(httpResponseCode);
      }
      http.end();
    }
    else {
      Serial.println("WiFi Disconnected");
    }
  }
}