AsyncHTTPRequest_Generic_callback_test.ino

#include <ESPAsyncTCP.h> // Manual installation from https://github.com/me-no-dev/ESPAsyncTCP
#include <AsyncHTTPRequest_Generic.h> // Docs available at https://github.com/khoih-prog/AsyncHTTPRequest_Generic
#include <ESP8266WiFi.h>

AsyncHTTPRequest request;

void setup() {
  Serial.begin(9600);
  
  WiFi.mode(WIFI_STA);
  WiFi.disconnect(true);
  WiFi.begin("YOUR_SSID", "YOUR_PASSWORD");
  Serial.print("Connecting to wifi...");
  while (WiFi.status() != WL_CONNECTED) {
    Serial.print(".");
    delay(100);
  }
  Serial.println("");
  if (WiFi.status() == WL_CONNECTED) {
    Serial.println("Connection OK!!!");
  } else {
    Serial.println("Connection FAILED!!!");
  }

  request.setDebug(false);
  request.setTimeout(3);
  request.onReadyStateChange(handleNetworkResult);
  
}

void sendRequest()
{
  Serial.println("");
  Serial.println("");
  Serial.println("****************************************");
  Serial.println("****************************************");
  Serial.println("****************************************");
  Serial.println("");
  Serial.println("");

  
  static bool requestOpenResult;

  if (request.readyState() == readyStateUnsent || request.readyState() == readyStateDone)
  {
    requestOpenResult = request.open("POST", "http://YOURDOMAIN.eu.ngrok.io/"); // Some accessible POST endpoint over HTTP (no https for testing) that accepts a JSON payload

    if (requestOpenResult)
    {
      String contentType = "application/json";
      String userAgent = "MyCustom-User-Agent-V1";
      request.setReqHeader("Content-Type", contentType.c_str());
      request.setReqHeader("User-Agent", userAgent.c_str());
      // Only send() if open() returns true, or crash
      Serial.println(F("Sending new request..."));
      String content = "{\"field1\": \"BLA\", \"field2\": \"BLA\", \"field3\": \"BLA\"}";
      request.send(content);
      //request.send("{}"); // Some empty json for testing
    }
    else
    {
      Serial.println(F("Can't send bad request"));
    }
  }
  else
  {
    Serial.println(F("Can't send request"));
  }
}


void handleNetworkResult(void *optParm, AsyncHTTPRequest *request, int readyState) {
  if (readyState == readyStateDone) {
    Serial.println("Network result... ");
    Serial.println(request->responseHTTPString());
    Serial.println(request->responseHTTPcode());
    Serial.println("Network result callback done!");
  }
}

void loop() {
  sendRequest();
  delay(10000); // 10 seconds

}