ESP32 Getting Started with AsyncServer

main.cpp

#include <Arduino.h>
#include <ArduinoJson.h>
#include <AsyncTCP.h>
#include <ESPAsyncWebServer.h>
#include <Wifi.h>

#define LED 2

const char *ssid = "[SSID]";
const char *pswd = "[PASSWD]";

// asyncwebserver on port 80
AsyncWebServer server(80);

bool newRequest = false;
int lightState = 0;

void initWifi() {
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, pswd);
  Serial.print("Connecting to WiFi..");

  // while (WiFi.waitForConnectResult()) != WL_CONNECTED) {
  //   Serial.printf("Wifi connection failed!\n");
  // }

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

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

void notFound(AsyncWebServerRequest *req) {
  req->send(404, "application/json", "{\"message\":\"Not found\"}");
}

void setup() {
  Serial.begin(115200);
  pinMode(LED, OUTPUT);

  initWifi();

  server.onNotFound(notFound);

  // health-check
  server.on("/", HTTP_GET, [](AsyncWebServerRequest *req) {
    req->send(200, "application/json", "{\"message\":\"health ok\"}");
  });

  server.on("/get-message", HTTP_GET, [](AsyncWebServerRequest *request) {
    StaticJsonDocument<100> data;
    if (request->hasParam("message")) {
      data["message"] = request->getParam("message")->value();
    } else {
      data["message"] = "No message parameter";
    }
    String response;
    serializeJson(data, response);
    request->send(200, "application/json", response);
  });

  server.on("/toggle", HTTP_POST, [](AsyncWebServerRequest *req) {
    digitalWrite(LED, lightState);
    Serial.write("LED Toggled...");
    lightState = !lightState;
    req->send(200, "application/json", "{\"message\":\"led toggled\"}");
  });

  server.begin();
}

void loop() {}

platformio.ini

; PlatformIO Project Configuration File
;
;   Build options: build flags, source filter
;   Upload options: custom upload port, speed and extra flags
;   Library options: dependencies, extra library storages
;   Advanced options: extra scripting
;
; Please visit documentation for the other options and examples
; https://docs.platformio.org/page/projectconf.html

[env:esp32doit-devkit-v1]
platform = espressif32
board = esp32doit-devkit-v1
framework = arduino
monitor_speed = 115200
lib_deps = 
	ESP Async WebServer
	me-no-dev/AsyncTCP@^1.1.1
	arduino-libraries/Stepper @ ^1.1.3
  bblanchon/ArduinoJson@^7.0.4