ESP32-CAM OTA Firmware Updates and WiFiManager Setup Portal

#include <WiFi.h>
#include <WiFiManager.h>      // tzapu WiFiManager
#include <ArduinoOTA.h>
#include <WebServer.h>
#include "esp_camera.h"

#define RESET_BTN 13             // hold LOW at boot to clear Wi-Fi
#define RED_LED   33             // active LOW
const char *HOSTNAME = "esp32cam-garden";
const char *OTA_PASS = "choose-a-strong-password";

// AI-Thinker ESP32-CAM pin map
#define PWDN_GPIO_NUM  32
#define RESET_GPIO_NUM -1
#define XCLK_GPIO_NUM   0
#define SIOD_GPIO_NUM  26
#define SIOC_GPIO_NUM  27
#define Y9_GPIO_NUM    35
#define Y8_GPIO_NUM    34
#define Y7_GPIO_NUM    39
#define Y6_GPIO_NUM    36
#define Y5_GPIO_NUM    21
#define Y4_GPIO_NUM    19
#define Y3_GPIO_NUM    18
#define Y2_GPIO_NUM     5
#define VSYNC_GPIO_NUM 25
#define HREF_GPIO_NUM  23
#define PCLK_GPIO_NUM  22

WebServer server(80);

bool initCamera() {
  camera_config_t c = {};
  c.ledc_channel = LEDC_CHANNEL_0;
  c.ledc_timer   = LEDC_TIMER_0;
  c.pin_d0 = Y2_GPIO_NUM;  c.pin_d1 = Y3_GPIO_NUM;
  c.pin_d2 = Y4_GPIO_NUM;  c.pin_d3 = Y5_GPIO_NUM;
  c.pin_d4 = Y6_GPIO_NUM;  c.pin_d5 = Y7_GPIO_NUM;
  c.pin_d6 = Y8_GPIO_NUM;  c.pin_d7 = Y9_GPIO_NUM;
  c.pin_xclk = XCLK_GPIO_NUM;   c.pin_pclk = PCLK_GPIO_NUM;
  c.pin_vsync = VSYNC_GPIO_NUM; c.pin_href = HREF_GPIO_NUM;
  c.pin_sccb_sda = SIOD_GPIO_NUM; c.pin_sccb_scl = SIOC_GPIO_NUM;
  c.pin_pwdn = PWDN_GPIO_NUM;   c.pin_reset = RESET_GPIO_NUM;
  c.xclk_freq_hz = 20000000;
  c.pixel_format = PIXFORMAT_JPEG;
  c.frame_size   = FRAMESIZE_SVGA;
  c.jpeg_quality = 12;
  c.fb_count     = 1;
  c.fb_location  = CAMERA_FB_IN_PSRAM;
  c.grab_mode    = CAMERA_GRAB_LATEST;
  return esp_camera_init(&c) == ESP_OK;
}

void handleJpg() {
  camera_fb_t *fb = esp_camera_fb_get();
  if (!fb) {
    server.send(500, "text/plain", "capture failed");
    return;
  }
  server.setContentLength(fb->len);
  server.send(200, "image/jpeg", "");
  server.sendContent((const char *)fb->buf, fb->len);
  esp_camera_fb_return(fb);
}

void setupOTA() {
  ArduinoOTA.setHostname(HOSTNAME);     // name shown in the IDE port list
  ArduinoOTA.setPassword(OTA_PASS);     // IDE asks for this on upload
  ArduinoOTA.onStart([]() {
    Serial.println("OTA start");
    server.stop();                      // stop serving during the update
    esp_camera_deinit();                // free camera memory
  });
  ArduinoOTA.onProgress([](unsigned int done, unsigned int total) {
    Serial.printf("OTA %u%%\r", done * 100 / total);
  });
  ArduinoOTA.onEnd([]() { Serial.println("\nOTA done, rebooting"); });
  ArduinoOTA.onError([](ota_error_t e) {
    Serial.printf("OTA error %u, restarting\n", e);
    ESP.restart();                      // camera was stopped, so reboot
  });
  ArduinoOTA.begin();
}

void setup() {
  Serial.begin(115200);
  pinMode(RESET_BTN, INPUT_PULLUP);
  pinMode(RED_LED, OUTPUT);
  digitalWrite(RED_LED, LOW);           // LED on while setting up

  WiFi.mode(WIFI_STA);
  WiFiManager wm;
  if (digitalRead(RESET_BTN) == LOW) {
    Serial.println("Clearing saved Wi-Fi");
    wm.resetSettings();
  }
  wm.setConfigPortalTimeout(180);       // give up after 3 minutes
  // Starts AP "ESP32CAM-Setup" if it cannot connect
  if (!wm.autoConnect("ESP32CAM-Setup", "setup1234")) {
    Serial.println("No Wi-Fi configured, restarting");
    ESP.restart();
  }
  Serial.printf("Connected, IP %s\n", WiFi.localIP().toString().c_str());

  if (!initCamera()) Serial.println("Camera init failed");
  server.on("/jpg", handleJpg);
  server.begin();
  setupOTA();
  digitalWrite(RED_LED, HIGH);          // LED off: ready
}

void loop() {
  ArduinoOTA.handle();                  // must run often
  server.handleClient();
}