Add arduino/esp32-http example

Author: cpq

examples/arduino/esp32-http/esp32-http.ino

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+#include "mongoose.h"
+#include "WiFi.h"
+
+#define LED_PIN LED_BUILTIN
+#define WIFI_SSID "wifi_network_name"  // Change this
+#define WIFI_PASS "wifi_password"      // And this
+
+struct mg_mgr mgr;
+
+// Crude function to get available RAM, for quick profiling
+size_t getFreeRAM(void) {
+  size_t size = 0, increment = 1024;
+  void *p;
+  while ((p = malloc(size)) != NULL) free(p), size += increment;
+  return size;
+}
+
+void http_ev_handler(struct mg_connection *c, int ev, void *ev_data) {
+  if (ev == MG_EV_HTTP_MSG) {
+    struct mg_http_message *hm = (struct mg_http_message *)ev_data;
+    if (mg_match(hm->uri, mg_str("/api/led/on"), NULL)) {
+      digitalWrite(LED_PIN, HIGH);
+      mg_http_reply(c, 200, "", "{%m: %d}\n", MG_ESC("led"), digitalRead(LED_PIN));
+    } else if (mg_match(hm->uri, mg_str("/api/led/off"), NULL)) {
+      digitalWrite(LED_PIN, LOW);
+      mg_http_reply(c, 200, "", "{%m: %d}\n", MG_ESC("led"), digitalRead(LED_PIN));
+    } else {
+      mg_http_reply(c, 200, "", "ok, free RAM: %u\n", xPortGetFreeHeapSize());
+    }
+  }
+}
+
+void setup() {
+  pinMode(LED_PIN, OUTPUT);
+  Serial.begin(115200);
+  while (!Serial) delay(50);
+
+  WiFi.mode(WIFI_STA);
+  WiFi.begin(WIFI_SSID, WIFI_PASS);
+  while(WiFi.status() != WL_CONNECTED) Serial.print("."), delay(100);
+
+  Serial.println("\nConnected to the WiFi network");
+  Serial.print("IP Address: ");
+  Serial.println(WiFi.localIP());
+
+  mg_mgr_init(&mgr);
+  mg_log_set(MG_LL_DEBUG);
+  mg_log_set_fn([](char ch, void *) { Serial.print(ch); }, NULL);
+  mg_http_listen(&mgr, "http://0.0.0.0", http_ev_handler, NULL);
+}
+
+void loop() {
+  mg_mgr_poll(&mgr, 0);
+}
+
+extern "C" int lwip_hook_ip6_input(struct pbuf *p, struct netif *inp) __attribute__((weak));
+extern "C" int lwip_hook_ip6_input(struct pbuf *p, struct netif *inp) {
+  if (ip6_addr_isany_val(inp->ip6_addr[0].u_addr.ip6)) {
+    pbuf_free(p);
+    return 1;
+  }
+  return 0;
+}

examples/arduino/esp32-http/mongoose.c

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+../../../mongoose.c

examples/arduino/esp32-http/mongoose.h

@@ -0,0 +1 @@
+../../../mongoose.h

examples/arduino/esp32-http/mongoose_config.h

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+#pragma once
+
+#define MG_ARCH MG_ARCH_ESP32