initial commit (shoulda done this earlier)

.gitignore

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+.pio

CMakeLists.txt

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

include/lwip_hooks.h

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+// file: <include/lwip_hooks.h>
+#ifndef _LWIP_HOOKS_H_
+#define _LWIP_HOOKS_H_
+
+#include "lwip/netif.h"
+#include "lwip/pbuf.h"
+#include "lwip/ip4.h"
+
+#include "lwip/prot/udp.h"
+#include "lwip/prot/tcp.h"
+
+#include "esp_log.h"
+#include "esp_err.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_ */

platformio.ini

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+[env:adafruit_qtpy_esp32s2]
+platform = espressif32
+board = adafruit_qtpy_esp32s2
+framework = espidf, arduino
+build_flags = 
+  '-Iinclude'
+  '-DESP_IDF_LWIP_HOOK_FILENAME="lwip_hooks.h"'
+lib_deps =
+  adafruit/Adafruit NeoPixel
+

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})

src/lwip_hooks.c

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+// file: <src/lwip_hooks.c>
+#include "lwip_hooks.h"
+extern void log_packet(uint16_t);
+
+const char *get_protocol(u16_t type)
+{
+    switch (type)
+    {
+    case 1:
+        return "ICMP";
+    case 6:
+        return "TCP";
+    case 17:
+        return "UDP";
+    default:
+        return "-";
+    }
+}
+
+int lwip_hook_ip4_input(struct pbuf *pbuf, struct netif *input_netif)
+{
+    const struct ip_hdr *iphdr;
+    const struct tcp_hdr *tcphdr;
+    const struct udp_hdr *udphdr;
+    char ip_address[IP_HLEN];
+    u16_t protocol;
+    uint16_t port;
+
+    iphdr = (struct ip_hdr *)pbuf->payload;
+    u16_t ilen = IPH_HL(iphdr);
+    protocol = (u16_t)IPH_PROTO(iphdr);
+    if (protocol == 6) {
+      //tcphdr = (struct tcp_hdr *)pbuf->payload;
+      tcphdr = (struct tcp_hdr *)&((u32_t*)iphdr)[ilen];
+      port = lwip_ntohs(tcphdr->dest);
+    } else if (protocol == 17) {
+      udphdr = (struct udp_hdr *)&((u32_t*)iphdr)[ilen];
+      port = lwip_ntohs(udphdr->dest);
+    } else {
+      port = 0;
+    }
+
+    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));
+    ESP_LOGI("HOOK", "%s: %s %u",
+             get_protocol((u16_t)IPH_PROTO(iphdr)), ip_address, port);
+
+    log_packet(port);
+
+    return ESP_OK;
+}

src/main.cpp

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+//file: main.c or main.cpp
+#include "Arduino.h"
+#include "WiFi.h"
+#include <Adafruit_Neopixel.h>
+
+#define NUMPIXELS       1
+#define PIN_NEOPIXEL   39
+#define NEOPIXEL_POWER 38
+
+char ssid[] = "MyWifi";             // your network SSID (name)
+char pass[] = "MyPassphrase";    // your network password (use for WPA, or use as key for WEP)
+
+Adafruit_NeoPixel pixels(NUMPIXELS, PIN_NEOPIXEL, NEO_GRB + NEO_KHZ800);
+
+extern "C" {
+  void log_packet(uint16_t port) {
+    if (WiFi.status() == WL_CONNECTED) {
+      pixels.rainbow(port);
+      pixels.show();
+    }
+  }
+}
+
+extern "C" void app_main()
+{
+  initArduino();
+
+#if defined(NEOPIXEL_POWER)
+  // If this board has a power control pin, we must set it to output and high
+  // in order to enable the NeoPixels. We put this in an #if defined so it can
+  // be reused for other boards without compilation errors
+  pinMode(NEOPIXEL_POWER, OUTPUT);
+  digitalWrite(NEOPIXEL_POWER, HIGH);
+#endif
+  pixels.begin(); // INITIALIZE NeoPixel strip object (REQUIRED)
+  pixels.setBrightness(20); // not so bright
+
+  printf("Connecting");
+  WiFi.begin(ssid, pass);
+    while (WiFi.status() != WL_CONNECTED) {
+      delay(500);
+      printf(".");
+  }
+  printf("\nConnected!\n");
+  printf("SSID: %s\n", WiFi.SSID().c_str());
+  printf("IP: %s\n", WiFi.localIP().toString().c_str());
+
+  // Arduino-like loop()
+  while(true){
+    ;
+  }
+}