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examples/ClientServer/Server/Server.ino

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+#include <ESP8266WiFi.h>
+#include <ESPAsyncTCP.h>
+#include <DNSServer.h>
+#include <vector>
+
+#include "config.h"
+
+static DNSServer DNS;
+
+static std::vector<AsyncClient*> clients; // a list to hold all clients
+
+ /* clients events */
+static void handleError(void* arg, AsyncClient* client, int8_t error) {
+	Serial.printf("\n connection error %s from client %s \n", client->errorToString(error), client->remoteIP().toString().c_str());
+}
+
+static void handleData(void* arg, AsyncClient* client, void *data, size_t len) {
+	Serial.printf("\n data received from client %s \n", client->remoteIP().toString().c_str());
+	Serial.write((uint8_t*)data, len);
+
+	// reply to client
+	if (client->space() > 32 && client->canSend()) {
+		char reply[32];
+		sprintf(reply, "this is from %s", SERVER_HOST_NAME);
+		client->add(reply, strlen(reply));
+		client->send();
+	}
+}
+
+static void handleDisconnect(void* arg, AsyncClient* client) {
+	Serial.printf("\n client %s disconnected \n", client->remoteIP().toString().c_str());
+}
+
+static void handleTimeOut(void* arg, AsyncClient* client, uint32_t time) {
+	Serial.printf("\n client ACK timeout ip: %s \n", client->remoteIP().toString().c_str());
+}
+
+
+/* server events */
+static void handleNewClient(void* arg, AsyncClient* client) {
+	Serial.printf("\n new client has been connected to server, ip: %s", client->remoteIP().toString().c_str());
+
+	// add to list
+	clients.push_back(client);
+	
+	// register events
+	client->onData(&handleData, NULL);
+	client->onError(&handleError, NULL);
+	client->onDisconnect(&handleDisconnect, NULL);
+	client->onTimeout(&handleTimeOut, NULL);
+}
+
+void setup() {
+	Serial.begin(115200);
+	delay(20);
+	
+	// create access point
+	while (!WiFi.softAP(SSID, PASSWORD, 6, false, 15)) {
+		delay(500);
+	}
+
+	// start dns server
+	if (!DNS.start(DNS_PORT, SERVER_HOST_NAME, WiFi.softAPIP()))
+		Serial.printf("\n failed to start dns service \n");
+
+	AsyncServer* server = new AsyncServer(TCP_PORT); // start listening on tcp port 7050
+	server->onClient(&handleNewClient, server);
+	server->begin();
+}
+
+void loop() {
+	DNS.processNextRequest();
+}

examples/ClientServer/Server/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