ESP32-S3搭建外网可访问的网络摄像头（内网穿透）

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本篇博文使用ESP32-S3搭建网络摄像头，相比较局域网摄像头，本篇博文将分享如何搭建外网可以访问的网络摄像头。
这主要是使用内网穿透技术，内网穿透是为了使具有某一个特定源 IP 地址和源端口号的数据包（这里指局域网摄像头）不被网络地址转换设备屏蔽而正确路由到内网主机。
主要流程分为两步：
1、先实现局域网访问网络摄像头；
2、在此基础，使用内网穿透的方式，搭建外网可访问的网络摄像头。
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5 D# x( \; W* o& _- s3 @局域网摄像头
6 |( Y, Z3 |: C" j% Z' kESP32实现局域网摄像头的方式比较简单，驱动代码如下：

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#include "esp_camera.h"#include
! [4 b0 `! {" W" h* R. `//// WARNING!!! PSRAM IC required for UXGA resolution and high JPEG quality//            Ensure ESP32 Wrover Module or other board with PSRAM is selected//            Partial images will be transmitted if image exceeds buffer size////            You must select partition scheme from the board menu that has at least 3MB APP space.//            Face Recognition is DISABLED for ESP32 and ESP32-S2, because it takes up from 15 //            seconds to process single frame. Face Detection is ENABLED if PSRAM is enabled as well
1 B( y" l! u! K% n, G% G// ===================// Select camera model// ===================//#define CAMERA_MODEL_WROVER_KIT // Has PSRAM// #define CAMERA_MODEL_ESP_EYE // Has PSRAM//#define CAMERA_MODEL_ESP32S3_EYE // Has PSRAM//#define CAMERA_MODEL_M5STACK_PSRAM // Has PSRAM//#define CAMERA_MODEL_M5STACK_V2_PSRAM // M5Camera version B Has PSRAM//#define CAMERA_MODEL_M5STACK_WIDE // Has PSRAM//#define CAMERA_MODEL_M5STACK_ESP32CAM // No PSRAM//#define CAMERA_MODEL_M5STACK_UNITCAM // No PSRAM//#define CAMERA_MODEL_AI_THINKER // Has PSRAM//#define CAMERA_MODEL_TTGO_T_JOURNAL // No PSRAM//#define CAMERA_MODEL_XIAO_ESP32S3 // Has PSRAM// ** Espressif Internal Boards **//#define CAMERA_MODEL_ESP32_CAM_BOARD//#define CAMERA_MODEL_ESP32S2_CAM_BOARD//#define CAMERA_MODEL_ESP32S3_CAM_LCD#define CAMERA_MODEL_DFRobot_FireBeetle2_ESP32S3 // Has PSRAM//#define CAMERA_MODEL_DFRobot_Romeo_ESP32S3 // Has PSRAM
- T' q- ]1 N* j1 T7 D" t5 \' X9 f#include "camera_pins.h"#include "DFRobot_AXP313A.h"
" Y+ s9 ^0 ~" R4 V6 x1 M; C0 k4 s0 DDFRobot_AXP313A axp;
. @: B: b0 R% I. `$ W// ===========================// Enter your WiFi credentials// ===========================const char* ssid = "";const char* password = "";
void startCameraServer();void setupLedFlash(int pin);
* [7 Q* V- j/ Q, rvoid setup() {  Serial.begin(115200);  Serial.setDebugOutput(true);  Serial.println();
  while(axp.begin() != 0){    Serial.println("init error");    delay(1000);  }
  axp.enableCameraPower(axp.eOV2640);  // 给摄像头供电
  camera_config_t config;  config.ledc_channel = LEDC_CHANNEL_0;  config.ledc_timer = LEDC_TIMER_0;  config.pin_d0 = Y2_GPIO_NUM;  config.pin_d1 = Y3_GPIO_NUM;  config.pin_d2 = Y4_GPIO_NUM;  config.pin_d3 = Y5_GPIO_NUM;  config.pin_d4 = Y6_GPIO_NUM;  config.pin_d5 = Y7_GPIO_NUM;  config.pin_d6 = Y8_GPIO_NUM;  config.pin_d7 = Y9_GPIO_NUM;  config.pin_xclk = XCLK_GPIO_NUM;  config.pin_pclk = PCLK_GPIO_NUM;  config.pin_vsync = VSYNC_GPIO_NUM;  config.pin_href = HREF_GPIO_NUM;  config.pin_sccb_sda = SIOD_GPIO_NUM;  config.pin_sccb_scl = SIOC_GPIO_NUM;  config.pin_pwdn = PWDN_GPIO_NUM;  config.pin_reset = RESET_GPIO_NUM;  config.xclk_freq_hz = 20000000;  config.frame_size = FRAMESIZE_UXGA;  config.pixel_format = PIXFORMAT_JPEG; // for streaming  //config.pixel_format = PIXFORMAT_RGB565; // for face detection/recognition  config.grab_mode = CAMERA_GRAB_WHEN_EMPTY;  config.fb_location = CAMERA_FB_IN_PSRAM;  config.jpeg_quality = 12;  config.fb_count = 1;
  // if PSRAM IC present, init with UXGA resolution and higher JPEG quality  //                      for larger pre-allocated frame buffer.  if(config.pixel_format == PIXFORMAT_JPEG){    if(psramFound()){      config.jpeg_quality = 10;      config.fb_count = 2;      config.grab_mode = CAMERA_GRAB_LATEST;    } else {      // Limit the frame size when PSRAM is not available      config.frame_size = FRAMESIZE_SVGA;      config.fb_location = CAMERA_FB_IN_DRAM;    }  } else {    // Best option for face detection/recognition    config.frame_size = FRAMESIZE_240X240;#if CONFIG_IDF_TARGET_ESP32S3    config.fb_count = 2;#endif  }
! u) G$ g1 M/ s8 p$ F#if defined(CAMERA_MODEL_ESP_EYE)  pinMode(13, INPUT_PULLUP);  pinMode(14, INPUT_PULLUP);#endif
$ v3 N( i/ D* {- r2 c! Y; c6 }  // camera init  esp_err_t err = esp_camera_init(&config);  if (err != ESP_OK) {    Serial.printf("Camera init failed with error 0x%x", err);    return;  }
  H8 X/ h$ {3 y( K$ I) z  sensor_t * s = esp_camera_sensor_get();  // initial sensors are flipped vertically and colors are a bit saturated  if (s->id.PID == OV3660_PID) {    s->set_vflip(s, 1); // flip it back    s->set_brightness(s, 1); // up the brightness just a bit    s->set_saturation(s, -2); // lower the saturation  }  // drop down frame size for higher initial frame rate  if(config.pixel_format == PIXFORMAT_JPEG){    s->set_framesize(s, FRAMESIZE_QVGA);  }
#if defined(CAMERA_MODEL_M5STACK_WIDE) || defined(CAMERA_MODEL_M5STACK_ESP32CAM)  s->set_vflip(s, 1);  s->set_hmirror(s, 1);#endif
#if defined(CAMERA_MODEL_ESP32S3_EYE)  s->set_vflip(s, 1);#endif
// Setup LED FLash if LED pin is defined in camera_pins.h#if defined(LED_GPIO_NUM)  setupLedFlash(LED_GPIO_NUM);#endif
! v7 q! `6 c/ s  O( t  WiFi.begin(ssid, password);  WiFi.setSleep(false);
  while (WiFi.status() != WL_CONNECTED) {    delay(500);    Serial.print(".");  }  Serial.println("");  Serial.println("WiFi connected");
) c5 E1 t4 Z5 [" V3 b  startCameraServer();
, K4 {) r9 |+ C/ O0 l, m# }  Serial.print("Camera Ready! Use 'http://");  Serial.print(WiFi.localIP());  Serial.println("' to connect");}
void loop() {  // Do nothing. Everything is done in another task by the web server  delay(10000);}
* _. F+ F+ i# `' F" N; J. A代码中有几点需要注意：

# s  m* v; J& t8 G9 a) n1、宏定义选择适配的摄像头模式。
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// ===================// Select camera model// ===================//#define CAMERA_MODEL_WROVER_KIT // Has PSRAM// #define CAMERA_MODEL_ESP_EYE // Has PSRAM//#define CAMERA_MODEL_ESP32S3_EYE // Has PSRAM//#define CAMERA_MODEL_M5STACK_PSRAM // Has PSRAM//#define CAMERA_MODEL_M5STACK_V2_PSRAM // M5Camera version B Has PSRAM//#define CAMERA_MODEL_M5STACK_WIDE // Has PSRAM//#define CAMERA_MODEL_M5STACK_ESP32CAM // No PSRAM//#define CAMERA_MODEL_M5STACK_UNITCAM // No PSRAM//#define CAMERA_MODEL_AI_THINKER // Has PSRAM//#define CAMERA_MODEL_TTGO_T_JOURNAL // No PSRAM//#define CAMERA_MODEL_XIAO_ESP32S3 // Has PSRAM// ** Espressif Internal Boards **//#define CAMERA_MODEL_ESP32_CAM_BOARD//#define CAMERA_MODEL_ESP32S2_CAM_BOARD//#define CAMERA_MODEL_ESP32S3_CAM_LCD#define CAMERA_MODEL_DFRobot_FireBeetle2_ESP32S3 // Has PSRAM//#define CAMERA_MODEL_DFRobot_Romeo_ESP32S3 // Has PSRAM
5 _9 w3 W5 I/ L1 m* o0 i# p: B2、无线路由器SSID和密码要填写正确。
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// ===========================// Enter your WiFi credentials// ===========================const char* ssid = "";const char* password = "";
# ^0 j; U  B2 l3 g1 e4 }3、给摄像头供电

axp.enableCameraPower(axp.eOV2640);  // 给摄像头供电
  e9 g" ^0 ~+ r4、板卡需要外接天线，否则可能无法连接路由器。

! ~# A5 s: T$ X9 A编译下载程序到板卡中，确保局域网访问网络摄像头可正常使用。
2
内网穿透网络摄像头
内网穿透我们使用花生壳这款软件提供的内网穿透服务。

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在官网下载APP：https://hsk.oray.com/

; o7 y$ N5 R, }/ ?# @下载安装完成后，在内网穿透服务点击新建映射，如下图所示：
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填写新建映射的基本信息，请注意内网主机和内网端口是局域网摄像头的主机和端口（端口默认为80） ，如下图所示：
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, ~9 A& k' u: f/ S: Z6 M5 R  U新建映射完成后，可以在APP看到新增的设备列表，如下图所示：

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复制访问网址，在浏览器中打开：http://2j90962r69.goho.co:47918/

( W# B% t, E0 P, e即使不在同一个局域网内也可以正常访问摄像头啦。

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