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examples/ClientServer/Client/Client.ino

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+#include <ESP8266WiFi.h>
+#include <ESPAsyncTCP.h>
+
+extern "C" {
+#include <osapi.h>
+#include <os_type.h>
+}
+
+#include "config.h"
+
+static os_timer_t intervalTimer;
+
+static void replyToServer(void* arg) {
+	AsyncClient* client = reinterpret_cast<AsyncClient*>(arg);
+
+	// send reply
+	if (client->space() > 32 && client->canSend()) {
+		char message[32];
+		sprintf(message, "this is from %s", WiFi.localIP().toString().c_str());
+		client->add(message, strlen(message));
+		client->send();
+	}
+}
+
+/* event callbacks */
+static void handleData(void* arg, AsyncClient* client, void *data, size_t len) {
+	Serial.printf("\n data received from %s \n", client->remoteIP().toString().c_str());
+	Serial.write((uint8_t*)data, len);
+
+	os_timer_arm(&intervalTimer, 2000, true); // schedule for reply to server at next 2s
+}
+
+void onConnect(void* arg, AsyncClient* client) {
+	Serial.printf("\n client has been connected to %s on port %d \n", SERVER_HOST_NAME, TCP_PORT);
+	replyToServer(client);
+}
+
+
+void setup() {
+	Serial.begin(115200);
+	delay(20);
+
+	// connects to access point
+	WiFi.mode(WIFI_STA);
+	WiFi.begin(SSID, PASSWORD);
+	while (WiFi.status() != WL_CONNECTED) {
+		Serial.print('.');
+		delay(500);
+	}
+
+	AsyncClient* client = new AsyncClient;
+	client->onData(&handleData, client);
+	client->onConnect(&onConnect, client);
+	client->connect(SERVER_HOST_NAME, TCP_PORT);
+
+	os_timer_disarm(&intervalTimer);
+	os_timer_setfn(&intervalTimer, &replyToServer, client);
+}
+
+void loop() {
+
+}

examples/ClientServer/Client/config.h

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+#ifndef CONFIG_H
+#define CONFIG_H
+
+/*
+ * This example demonstrate how to use asynchronous client & server APIs
+ * in order to establish tcp socket connections in client server manner.
+ * server is running (on port 7050) on one ESP, acts as AP, and other clients running on
+ * remaining ESPs acts as STAs. after connection establishment between server and clients
+ * there is a simple message transfer in every 2s. clients connect to server via it's host name
+ * (in this case 'esp_server') with help of DNS service running on server side.
+ *
+ * Note: default MSS for ESPAsyncTCP is 536 byte and defualt ACK timeout is 5s.
+*/
+
+#define SSID "ESP-TEST"
+#define PASSWORD "123456789"
+
+#define SERVER_HOST_NAME "esp_server"
+
+#define TCP_PORT 7050
+#define DNS_PORT 53
+
+#endif // CONFIG_H