TEST_TCP_Server_LED_ESP32.ino

#include<WiFi.h>

#define WIFI_STA_NAME "xxxxxxxxxx"
#define WIFI_STA_PASS "xxxxxxxxxx"

#define LED_PIN 23

WiFiServer server(80);

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

  Serial.println();
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(WIFI_STA_NAME);

  WiFi.mode(WIFI_STA);
  WiFi.begin(WIFI_STA_NAME, WIFI_STA_PASS);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
    digitalWrite(LED_BUILTIN, !digitalRead(LED_BUILTIN));
  }

  digitalWrite(LED_BUILTIN, HIGH);
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());

  server.begin();
}

void loop() {
  WiFiClient client = server.available();

  if (client) {
    Serial.println("new client");
    client.Stream::setTimeout(100);
    while (client.connected()) {
      if (client.available()) {
        String msg = client.readString();
        digitalWrite(LED_PIN, (msg == "ON") ? HIGH : LOW);
        client.print("OK");
        Serial.println("Set LED to " + (String)((msg == "ON") ? "ON" : "OFF"));
      }
      delay(1);
    }
    client.stop();
    Serial.println("client disonnected");
  }
  delay(10);
}