Basic setup with hook and arduino for esp32

ESP32Firewall/.gitignore

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+.pio
+.vscode
+include/theSecrets.h

ESP32Firewall/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.16.0)
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(ESP32Firewall)

ESP32Firewall/include/lwip_hooks.h

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+#ifndef _LWIP_HOOKS_H_
+#define _LWIP_HOOKS_H_
+
+#include "lwip/netif.h"
+#include "lwip/pbuf.h"
+#include "lwip/ip4.h"
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+    int lwip_hook_ip4_input(struct pbuf *pbuf, struct netif *input_netif);
+#define LWIP_HOOK_IP4_INPUT lwip_hook_ip4_input
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _LWIP_HOOKS_H_ */

ESP32Firewall/include/theSecrets-example.h

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+#ifndef _THE_SECRETS_H_
+#define _THE_SECRETS_H_
+
+const char *ssid = "Wifi";
+const char *psk = "password";
+const char *username = "username";
+const char *password = "password";
+
+#endif

ESP32Firewall/platformio.ini

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+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:az-delivery-devkit-v4]
+platform = espressif32
+board = az-delivery-devkit-v4
+framework = espidf
+monitor_speed = 115200
+build_flags = 
+    '-Iinclude'
+    '-DESP_IDF_LWIP_HOOK_FILENAME="lwip_hooks.h"'

ESP32Firewall/src/CMakeLists.txt

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+# This file was automatically generated for projects
+# without default 'CMakeLists.txt' file.
+
+FILE(GLOB_RECURSE app_sources ${CMAKE_SOURCE_DIR}/src/*.*)
+
+idf_component_register(SRCS ${app_sources})

ESP32Firewall/src/main.cpp

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+#include "Arduino.h"
+#include "theSecrets.h"
+#include "WiFi.h"
+#include "lwip_hooks.h"
+
+int lwip_hook_ip4_input(struct pbuf *pbuf, struct netif *input_netif)
+{
+    const struct ip_hdr *iphdr;
+    char ip_address[IP_HLEN];
+
+    iphdr = (struct ip_hdr *)pbuf->payload;
+    sprintf(ip_address, "%d.%d.%d.%d", ip4_addr1_16_val(iphdr->src), ip4_addr2_16_val(iphdr->src), ip4_addr3_16_val(iphdr->src), ip4_addr4_16_val(iphdr->src));
+    Serial.print((u16_t)IPH_PROTO(iphdr));
+    Serial.print(": ");
+    Serial.println(ip_address);
+    return 0;
+}
+
+void setup()
+{
+    Serial.begin(115200);
+    Serial.println();
+    WiFi.begin(ssid, psk);
+    while (!WiFi.isConnected())
+    {
+        Serial.print(".");
+        delay(200);
+    }
+    Serial.println();
+    Serial.print("[WiFi] IP: ");
+    Serial.println(WiFi.localIP());
+}
+
+void loop()
+{
+    Serial.println("test");
+    sleep(1000);
+}