Add an example for http post

post/ESP32_post.ino

@@ -0,0 +1,71 @@
+//
+// A simple server implementation showing how to:
+//  * serve static messages
+//  * read GET and POST parameters
+//  * handle missing pages / 404s
+//
+#define LED_BUILTIN 2
+#include <Arduino.h>
+#ifdef ESP32
+#include <WiFi.h>
+#include <AsyncTCP.h>
+#elif defined(ESP8266)
+#include <ESP8266WiFi.h>
+#include <ESPAsyncTCP.h>
+#endif
+#include <ESPAsyncWebServer.h>
+AsyncWebServer server(80);
+
+const char* ssid = "********";
+const char* password = "*********";
+
+const char* PARAM_MESSAGE = "message";
+
+void notFound(AsyncWebServerRequest *request) {
+    request->send(404, "text/plain", "Not found");
+}
+
+void setup() {
+    pinMode(LED_BUILTIN, OUTPUT);
+
+    Serial.begin(115200);
+    WiFi.mode(WIFI_STA);
+    WiFi.begin(ssid, password);
+    while (WiFi.status() != WL_CONNECTED) {
+      delay(500);
+      Serial.print(".");
+  }
+    
+    Serial.println("Connected");
+    Serial.print("IP Address: ");
+    Serial.println(WiFi.localIP());
+
+    // Send a POST request to <IP>/post with a form field message set to <message>
+    server.on("/LED", HTTP_POST, [](AsyncWebServerRequest *request){
+        String message;
+        if (request->hasParam(PARAM_MESSAGE, true)) {
+            message = request->getParam(PARAM_MESSAGE, true)->value();
+        } else {
+            message = "No message sent";
+        }
+
+        if (message == "ON"){
+          digitalWrite(LED_BUILTIN, HIGH);
+          request->send(200, "text/plain", "OK \n");
+        } else if (message == "OFF") {
+          digitalWrite(LED_BUILTIN, LOW);
+          request->send(200, "text/plain", "OK \n");
+        }else {
+          request->send(400, "text/plain", "Bad Request\n");
+        }
+        
+        
+    });
+
+    server.onNotFound(notFound);
+
+    server.begin();
+}
+
+void loop() {
+}