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// SPDX-License-Identifier: LGPL-3.0-or-later
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// Copyright 2016-2026 Hristo Gochkov, Mathieu Carbou, Emil Muratov, Will Miles
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#include <Arduino.h>
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#include <AsyncTCP.h>
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#include <WiFi.h>
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// Run a server at the root of the project with:
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// > python3 -m http.server 3333
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// Now you can open a browser and test it works by visiting http://192.168.125.122:3333/ or http://192.168.125.122:3333/README.md
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#define HOST "192.168.125.122"
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#define PORT 3333
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// WiFi SSID to connect to
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#define WIFI_SSID "IoT"
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// 16 slots on esp32 (CONFIG_LWIP_MAX_ACTIVE_TCP)
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#define MAX_CLIENTS CONFIG_LWIP_MAX_ACTIVE_TCP
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// #define MAX_CLIENTS 1
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size_t permits = MAX_CLIENTS;
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void makeRequest() {
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if (!permits) {
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return;
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}
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Serial.printf("** permits: %d\n", permits);
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AsyncClient *client = new AsyncClient;
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client->onError([](void *arg, AsyncClient *client, int8_t error) {
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Serial.printf("** error occurred %s \n", client->errorToString(error));
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client->close();
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delete client;
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});
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client->onConnect([](void *arg, AsyncClient *client) {
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permits--;
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Serial.printf("** client has been connected: %" PRIu16 "\n", client->localPort());
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client->onDisconnect([](void *arg, AsyncClient *client) {
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Serial.printf("** client has been disconnected: %" PRIu16 "\n", client->localPort());
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client->close();
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delete client;
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permits++;
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makeRequest();
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});
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client->onData([](void *arg, AsyncClient *client, void *data, size_t len) {
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Serial.printf("** data received by client: %" PRIu16 ": len=%u\n", client->localPort(), len);
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});
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client->write("GET /README.md HTTP/1.1\r\nHost: " HOST "\r\nUser-Agent: ESP\r\nConnection: close\r\n\r\n");
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});
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if (client->connect(HOST, PORT)) {
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} else {
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Serial.println("** connection failed");
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}
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}
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void setup() {
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Serial.begin(115200);
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while (!Serial) {
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continue;
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}
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WiFi.mode(WIFI_STA);
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WiFi.begin(WIFI_SSID);
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while (WiFi.status() != WL_CONNECTED) {
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delay(500);
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Serial.print(".");
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}
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Serial.println("** connected to WiFi");
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Serial.println(WiFi.localIP());
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for (size_t i = 0; i < MAX_CLIENTS; i++) {
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makeRequest();
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}
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}
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void loop() {
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delay(1000);
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Serial.printf("** free heap: %" PRIu32 "\n", ESP.getFreeHeap());
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}
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