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Multi wifi (#64)

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* Multi-Wifi with best signal scanning and retry when disconnected
* AP mode; can work (optionally) as a fallback when no network found
* Captive portal
* Dump output tweaks
* Config file comments
This commit is contained in:
Owen Carter
2020-10-06 13:29:54 +02:00
committed by GitHub
parent 148a29361b
commit 1399d874fc
3 changed files with 544 additions and 364 deletions
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39
app_httpd.cpp
View File

@ -40,6 +40,9 @@ extern char streamURL[];
extern int8_t detection_enabled;
extern int8_t recognition_enabled;
extern bool filesystem;
extern bool accesspoint;
extern bool captivePortal;
extern char apName[];
extern int httpPort;
extern int streamPort;
extern IPAddress ip;
@ -180,7 +183,7 @@ static void draw_face_boxes(dl_matrix3du_t *image_matrix, box_array_t *boxes, in
fb_gfx_drawFastHLine(&fb, x, y+h-1, w, color);
fb_gfx_drawFastVLine(&fb, x, y, h, color);
fb_gfx_drawFastVLine(&fb, x+w-1, y, h, color);
#if 0
#if 0
// landmark
int x0, y0, j;
for (j = 0; j < 10; j+=2) {
@ -188,7 +191,7 @@ static void draw_face_boxes(dl_matrix3du_t *image_matrix, box_array_t *boxes, in
y0 = (int)boxes->landmark[i].landmark_p[j+1];
fb_gfx_fillRect(&fb, x0, y0, 3, 3, color);
}
#endif
#endif
}
}
@ -602,10 +605,10 @@ static esp_err_t cmd_handler(httpd_req_t *req){
Serial.print("REBOOT requested");
for (int i=0; i<20; i++) {
flashLED(50);
delay(50);
delay(150);
Serial.print('.');
}
Serial.printf("\nThats all folks...\n\n");
Serial.printf(" Thats all folks!\n\n");
ESP.restart();
}
else {
@ -725,19 +728,43 @@ static esp_err_t dump_handler(httpd_req_t *req){
Serial.printf("ESP sdk: %s\n", ESP.getSdkVersion());
// Network
d+= sprintf(d,"<h2>WiFi</h2>\n");
if (accesspoint) {
if (captivePortal) {
d+= sprintf(d,"Mode: AccessPoint with captive portal<br>\n");
Serial.printf("Mode: AccessPoint with captive portal\n");
} else {
d+= sprintf(d,"Mode: AccessPoint<br>\n");
Serial.printf("Mode: AccessPoint\n");
}
d+= sprintf(d,"SSID: %s<br>\n", apName);
Serial.printf("SSID: %s\n", apName);
} else {
d+= sprintf(d,"Mode: Client<br>\n");
Serial.printf("Mode: Client\n");
String ssidName = WiFi.SSID();
d+= sprintf(d,"SSID: %s<br>\n", ssidName.c_str());
Serial.printf("Ssid: %s\n", ssidName.c_str());
d+= sprintf(d,"Rssi: %i<br>\n", WiFi.RSSI());
Serial.printf("Rssi: %i\n", WiFi.RSSI());
d+= sprintf(d,"Http port: %i, Stream port: %i<br>\n", httpPort, streamPort);
Serial.printf("Http port: %i, Stream port: %i\n", httpPort, streamPort);
String bssid = WiFi.BSSIDstr();
d+= sprintf(d,"BSSID: %s<br>\n", bssid.c_str());
Serial.printf("BSSID: %s\n", bssid.c_str());
}
d+= sprintf(d,"IP address: %d.%d.%d.%d<br>\n", ip[0], ip[1], ip[2], ip[3]);
Serial.printf("IP address: %d.%d.%d.%d\n", ip[0], ip[1], ip[2], ip[3]);
if (!accesspoint) {
d+= sprintf(d,"Netmask: %d.%d.%d.%d<br>\n", net[0], net[1], net[2], net[3]);
Serial.printf("Netmask: %d.%d.%d.%d\n", net[0], net[1], net[2], net[3]);
d+= sprintf(d,"Gateway: %d.%d.%d.%d<br>\n", gw[0], gw[1], gw[2], gw[3]);
Serial.printf("Gateway: %d.%d.%d.%d\n", gw[0], gw[1], gw[2], gw[3]);
}
d+= sprintf(d,"Http port: %i, Stream port: %i<br>\n", httpPort, streamPort);
Serial.printf("Http port: %i, Stream port: %i\n", httpPort, streamPort);
byte mac[6];
WiFi.macAddress(mac);
d+= sprintf(d,"MAC: %02X:%02X:%02X:%02X:%02X:%02X<br>\n", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
Serial.printf("MAC: %02X:%02X:%02X:%02X:%02X:%02X\n", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
// System
d+= sprintf(d,"<h2>System</h2>\n");
int64_t sec = esp_timer_get_time() / 1000000;

272
esp32-cam-webserver.ino
View File

@ -1,5 +1,6 @@
#include "esp_camera.h"
#include <WiFi.h>
#include <DNSServer.h>
/* This sketch is a extension/expansion/reork of the 'official' ESP32 Camera example
* sketch from Expressif:
@ -29,18 +30,13 @@
// Primary config, or defaults.
#if __has_include("myconfig.h")
// I keep my settings in a seperate header file
#include "myconfig.h"
#else
#warning "Using Default Settings: Copy myconfig.sample.h to myconfig.h and edit that to set your personal defaults"
// These are the defaults.. dont edit these.
// copy myconfig.sample.h to myconfig.h and edit that instead
// SSID, Password and Mode
const char* ssid = "ESP32-CAM-CONNECT";
const char* password = "InsecurePassword";
#warning "Using Defaults: Copy myconfig.sample.h to myconfig.h and edit that to use your own settings"
#define WIFI_AP_ENABLE
// Default Board and Camera:
#define CAMERA_MODEL_AI_THINKER
struct station { const char ssid[64]; const char password[64]; const bool dhcp;}
stationList[] = {{"ESP32-CAM-CONNECT","InsecurePassword", true}};
#endif
// Pin Mappings
@ -55,7 +51,11 @@ int sketchSize;
int sketchSpace;
String sketchMD5;
// IP address, netmask and gateway
// Start with accesspoint mode disabled, wifi setup will activate it if
// no known networks are found, and WIFI_AP_ENABLE has been defined
bool accesspoint = false;
// IP address, Netmask and Gateway, populated when connected
IPAddress ip;
IPAddress net;
IPAddress gw;
@ -87,6 +87,22 @@ extern void startCameraServer(int hPort, int sPort);
#define WIFI_WATCHDOG 5000
#endif
// Number of known networks in stationList[]
int stationCount = sizeof(stationList)/sizeof(stationList[0]);
// If we have AP mode enabled, ignore first entry in the stationList[]
#if defined(WIFI_AP_ENABLE)
int firstStation = 1;
#else
int firstStation = 0;
#endif
// DNS server
const byte DNS_PORT = 53;
DNSServer dnsServer;
bool captivePortal = false;
char apName[64] = "Undefined";
// The stream URL
char streamURL[64] = {"Undefined"}; // Stream URL to pass to the app.
@ -118,10 +134,10 @@ const int pwmfreq = 50000; // 50K pwm frequency
const int pwmresolution = 9; // duty cycle bit range
const int pwmMax = pow(2,pwmresolution)-1;
#if defined(HAS_FS)
bool filesystem = true;
#else
#if defined(NO_FS)
bool filesystem = false;
#else
bool filesystem = true;
#endif
#if defined(FACE_DETECTION)
@ -160,40 +176,50 @@ void setLamp(int newVal) {
}
}
void WifiSetup(){
void WifiSetup() {
// Feedback that we are now attempting to connect
flashLED(300);
delay(100);
flashLED(300);
int bestStation = -1;
long bestRSSI = -1024;
Serial.printf("Scanning local Wifi Networks\n");
int stationsFound = WiFi.scanNetworks();
Serial.printf("%i networks found\n", stationsFound);
if (stationsFound > 0) {
for (int i = 0; i < stationsFound; ++i) {
// Print SSID and RSSI for each network found
String thisSSID = WiFi.SSID(i);
int thisRSSI = WiFi.RSSI(i);
Serial.printf("%3i : %s (%i)", i + 1, thisSSID.c_str(), thisRSSI);
// Scan our list of known external stations, if any
if (stationCount > firstStation) {
for (int sta = firstStation; sta < stationCount; sta++) {
if (strcmp(stationList[sta].ssid, thisSSID.c_str()) == 0) {
Serial.print(" - Known!");
// Chose the strongest RSSI seen
if (thisRSSI > bestRSSI) {
bestStation = sta;
bestRSSI = thisRSSI;
}
}
}
}
Serial.println();
}
}
if (bestStation == -1) {
Serial.println("\nNo known networks found");
#if defined(WIFI_AP_ENABLE)
#if defined(AP_ADDRESS)
// User has specified the AP details, pre-configure AP
IPAddress local_IP(AP_ADDRESS);
IPAddress gateway(AP_ADDRESS);
IPAddress subnet(255,255,255,0);
WiFi.softAPConfig(local_IP, gateway, subnet);
// Failover to accesspoint mode if no known networks are visible
accesspoint = true;
#endif
#if defined(AP_CHAN)
WiFi.softAP(ssid, password, AP_CHAN);
Serial.println("Setting up Fixed Channel AccessPoint");
Serial.print("SSID : ");
Serial.println(ssid);
Serial.print("Password : ");
Serial.println(password);
Serial.print("Channel : ");
Serial.println(AP_CHAN);
# else
WiFi.softAP(ssid, password);
Serial.println("Setting up AccessPoint");
Serial.print("SSID : ");
Serial.println(ssid);
Serial.print("Password : ");
Serial.println(password);
#endif
#else
Serial.printf("Connecting to Wifi Network: %s ", ssid);
} else {
Serial.printf("Connecting to Wifi Network: %s\n", stationList[bestStation].ssid);
if (stationList[bestStation].dhcp == false) {
#if defined(ST_IP)
Serial.println("Applying static IP settings");
#if !defined (ST_GATEWAY) || !defined (ST_NETMASK)
#error "You must supply both Gateway and NetMask when specifying a static IP address"
#endif
@ -211,30 +237,86 @@ void WifiSetup(){
WiFi.config(staticIP, gateway, subnet, dns1, dns2);
#endif
#endif
#else
Serial.println("Static IP settings requested but not defined in config, falling back to dhcp");
#endif
}
// Initiate network connection request
WiFi.begin(ssid, password);
WiFi.begin(stationList[bestStation].ssid, stationList[bestStation].password);
// Wait to connect, or timeout
unsigned long start = millis();
while ((millis() - start <= WIFI_WATCHDOG) && (WiFi.status() != WL_CONNECTED)) {
delay(WIFI_WATCHDOG / 10);
delay(500);
Serial.print('.');
}
// If we have connected, show details
// If we have connected, inform user
if (WiFi.status() == WL_CONNECTED) {
Serial.println(" Succeeded");
// Burst flash the LED to show we are connected
Serial.println("Client connection succeeded");
accesspoint = false;
// Note IP details
ip = WiFi.localIP();
net = WiFi.subnetMask();
gw = WiFi.gatewayIP();
Serial.printf("IP address: %d.%d.%d.%d\n",ip[0],ip[1],ip[2],ip[3]);
Serial.printf("Netmask : %d.%d.%d.%d\n",net[0],net[1],net[2],net[3]);
Serial.printf("Gateway : %d.%d.%d.%d\n",gw[0],gw[1],gw[2],gw[3]);
// Flash the LED to show we are connected
for (int i = 0; i < 5; i++) {
flashLED(80);
delay(120);
flashLED(50);
delay(150);
}
} else {
Serial.println(" Failed");
Serial.println("Client connection Failed");
WiFi.disconnect(); // (resets the WiFi scan)
}
}
if (accesspoint && (WiFi.status() != WL_CONNECTED)) {
// The accesspoint has been enabled
#if defined(AP_CHAN)
Serial.println("Setting up Fixed Channel AccessPoint");
Serial.print(" SSID : ");
Serial.println(stationList[0].ssid);
Serial.print(" Password : ");
Serial.println(stationList[0].password);
Serial.print(" Channel : ");
Serial.println(AP_CHAN);
WiFi.softAP(stationList[0].ssid, stationList[0].password, AP_CHAN);
# else
Serial.println("Setting up AccessPoint");
Serial.print(" SSID : ");
Serial.println(stationList[0].ssid);
Serial.print(" Password : ");
Serial.println(stationList[0].password);
WiFi.softAP(stationList[0].ssid, stationList[0].password);
#endif
#if defined(AP_ADDRESS)
// User has specified the AP details; apply them after a short delay
// (https://github.com/espressif/arduino-esp32/issues/985#issuecomment-359157428)
delay(100);
IPAddress local_IP(AP_ADDRESS);
IPAddress gateway(AP_ADDRESS);
IPAddress subnet(255,255,255,0);
WiFi.softAPConfig(local_IP, gateway, subnet);
#endif
// Note AP details
ip = WiFi.softAPIP();
net = WiFi.subnetMask();
gw = WiFi.gatewayIP();
strcpy(apName, stationList[0].ssid);
Serial.printf("IP address: %d.%d.%d.%d\n",ip[0],ip[1],ip[2],ip[3]);
// Flash the LED to show we are connected
for (int i = 0; i < 5; i++) {
flashLED(150);
delay(50);
}
// Start the DNS captive portal if requested
if (stationList[0].dhcp == true) {
Serial.println("Starting Captive Portal");
dnsServer.start(DNS_PORT, "*", ip);
captivePortal = true;
}
}
}
void setup() {
@ -247,9 +329,15 @@ void setup() {
Serial.print("Code Built: ");
Serial.println(myVer);
if (stationCount == 0) {
Serial.println("\nFatal Error; Halting");
Serial.println("No wifi ssid details have been configured; we cannot connect to WiFi or start our own AccessPoint");
while (true) delay(1000);
}
#if defined(LED_PIN) // If we have a notification LED, set it to output
pinMode(LED_PIN, OUTPUT);
digitalWrite(LED_PIN, LED_OFF);
digitalWrite(LED_PIN, LED_ON);
#endif
// Create camera config structure; and populate with hardware and other defaults
@ -292,27 +380,31 @@ void setup() {
// 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;
if (err == ESP_OK) {
Serial.println("Camera init succeeded");
} else {
delay(100); // need a delay here or the next serial o/p gets missed
Serial.println("Halted: Camera sensor failed to initialise");
Serial.println("Will reboot to try again in 10s\n");
delay(10000);
ESP.restart();
}
sensor_t * s = esp_camera_sensor_get();
// Dump camera module, warn for unsupported modules.
switch (s->id.PID) {
case OV9650_PID: Serial.println("WARNING: OV9650 camera module is not properly supported, will fallback to OV2640 operation"); break;
case OV7725_PID: Serial.println("WARNING: OV7725 camera module is not properly supported, will fallback to OV2640 operation"); break;
case OV2640_PID: Serial.println("OV2640 camera module detected"); break;
case OV3660_PID: Serial.println("OV3660 camera module detected"); break;
// case OV5640_PID: Serial.println("WARNING: OV5640 camera module is not properly supported, will fallback to OV2640 operation"); break;
default: Serial.println("WARNING: Camera module is unknown and not properly supported, will fallback to OV2640 operation");
}
// OV3660 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 blightness just a bit
s->set_saturation(s, -2);//lower the saturation
s->set_vflip(s, 1); //flip it back
s->set_brightness(s, 1); //up the blightness just a bit
s->set_saturation(s, -2); //lower the saturation
}
// M5 Stack Wide has special needs
@ -340,6 +432,9 @@ void setup() {
* Add any other defaults you want to apply at startup here:
* uncomment the line and set the value as desired (see the comments)
*/
//s->set_framesize(s, FRAMESIZE_SVGA); // FRAMESIZE_[QQVGA|HQVGA|QVGA|CIF|VGA|SVGA|XGA|SXGA|UXGA|QXGA(ov3660)]);
//s->set_quality(s, val); // 10 to 63
//s->set_brightness(s, 0); // -2 to 2
//s->set_contrast(s, 0); // -2 to 2
//s->set_saturation(s, 0); // -2 to 2
@ -389,27 +484,28 @@ void setup() {
// We need a working Wifi before we can start the http handlers
Serial.println("Starting WiFi");
#if defined(WIFI_AP_ENABLE)
WifiSetup();
#else
while (WiFi.status() != WL_CONNECTED) {
WifiSetup();
Serial.print("Known external SSIDs: ");
if (firstStation < stationCount) {
for (int i=firstStation; i < stationCount; i++) Serial.printf(" '%s'", stationList[i].ssid);
} else {
Serial.print("None");
}
#endif
Serial.println();
byte mac[6];
WiFi.macAddress(mac);
Serial.printf("MAC address: %02X:%02X:%02X:%02X:%02X:%02X\n", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
// Start the two http handlers for the HTTP UI and Stream.
// Having got this far; start Wifi and loop until we are connected or have started an AccessPoint
while ((WiFi.status() != WL_CONNECTED) && !accesspoint) {
WifiSetup();
delay(1000);
}
// Now we have a network we can start the two http handlers for the UI and Stream.
startCameraServer(httpPort, streamPort);
// find our IP address
// Construct the app and stream URLs
char httpURL[64] = {"Unknown"};
#if defined(WIFI_AP_ENABLE)
ip = WiFi.softAPIP();
#else
ip = WiFi.localIP();
#endif
net = WiFi.subnetMask();
gw = WiFi.gatewayIP();
// Construct the App URL
if (httpPort != 80) {
sprintf(httpURL, "http://%d.%d.%d.%d:%d/", ip[0], ip[1], ip[2], ip[3], httpPort);
} else {
@ -418,36 +514,48 @@ void setup() {
Serial.printf("\nCamera Ready!\nUse '%s' to connect\n", httpURL);
// Construct the Stream URL
sprintf(streamURL, "http://%d.%d.%d.%d:%d/", ip[0], ip[1], ip[2], ip[3], streamPort);
Serial.printf("Stream viewer available at '%s/view'\n", streamURL);
Serial.printf("Stream viewer available at '%sview'\n", streamURL);
Serial.printf("Raw stream URL is '%s'\n", streamURL);
// Used when dumpung status; slow functions, so do them here
// Used when dumpung status; slow functions, so do them here during startup
sketchSize = ESP.getSketchSize();
sketchSpace = ESP.getFreeSketchSpace();
sketchMD5 = ESP.getSketchMD5();
}
void loop() {
// Just loop forever, reconnecting Wifi As necesscary.
// The stream and URI handler processes initiated by the startCameraServer() call at the
// end of setup() will handle the camera and UI processing from now on.
#if defined(WIFI_AP_ENABLE)
delay(WIFI_WATCHDOG);
#else
/*
* Just loop forever, reconnecting Wifi As necesscary in client mode
* The stream and URI handler processes initiated by the startCameraServer() call at the
* end of setup() will handle the camera and UI processing from now on.
*/
if (accesspoint) {
// Accespoint is permanently up, so just loop, servicing the captive portal as needed
unsigned long start = millis();
while (millis() - start < WIFI_WATCHDOG ) {
delay(100);
if (captivePortal) dnsServer.processNextRequest();
}
} else {
// client mode can fail; so reconnect as appropriate
static bool warned = false;
if (WiFi.status() == WL_CONNECTED) {
// We are connected, wait a bit and re-check
if (warned) {
// Tell the user if we have just reconnected
Serial.println("WiFi reconnected");
warned = false;
}
delay(WIFI_WATCHDOG);
} else {
// disconnected; attempt to reconnect
if (!warned) {
// Tell the user if we just disconnected
WiFi.disconnect(); // ensures disconnect is complete, wifi scan cleared
Serial.println("WiFi disconnected, retrying");
warned = true;
}
WifiSetup();
}
#endif
}
}

93
myconfig.sample.h
View File

@ -16,44 +16,87 @@
* Note the the use of commas as seperators in IP addresses!
*/
// Credentials
const char* ssid = "my-ssid";
const char* password = "my-password";
// WiFi Credentials
// A structure for each WiFi network entry
struct station
{
const char ssid[64]; // ssid (max 64 chars)
const char password[64]; // password (max 64 chars)
const bool dhcp; // dhcp
};
/*
* Extend the list below with additional SSID+Password pairs like this:
struct station stationList[] = {{"ssid1", "pass1", true},
{"ssid2", "pass2", true},
{"ssid3", "pass3", false}};
* The first entry will be used for the AccessPoint ssid and password when it is enabled
* The 'dhcp' setting controls wether the station uses static IP settings (if in doubt leave 'true')
* Note the use of nested braces '{' and '}' to group each entry, and commas ',' to seperate them.
*/
struct station stationList[] = {{"my_ssid","my_password", false}};
// AccessPoint; uncomment to enable AP mode,
// otherwise we will attempt to connect to an existing network.
// #define WIFI_AP_ENABLE
/*
* Static network settings for client mode
*
* Note: The same settings will be applied to all client connections where the dhcp setting is 'false'
* You must define all three: IP, Gateway and NetMask
*/
// warning - IP addresses must be seperated with commas (,) and not decimals (.)
// #define ST_IP 192,168,0,16
// #define ST_GATEWAY 192,168,0,2
// #define ST_NETMASK 255,255,255,0
// One or two optional DNS servers can be supplied, but the current firmware never uses them ;-)
// #define ST_DNS1 192,168,0,2
// #define ST_DNS2 8,8,8,8
// AccessPoint; change the ip address (optional, default = 192.168.4.1)
/*
* AccessPoint;
*
* Uncomment to enable AP mode;
*
*/
#define WIFI_AP_ENABLE
/* AP Mode Notes:
*
* Once enabled the AP ssid and password will be taken from the 1st entry in the stationList[] above.
*
* If there are further entries listed they will be scanned at startup and connected to if they are found.
* Making the AP a fallback mode that happens only when there are no 'real' networks available
*
* Setting the dhcp field to true for the AP enables a captive portal and attempts to send
* all incoming pages to the webcam page, with varying degrees of success depending on the visitors
* browser and other settings.
* - The Captive Portal really needs a seperate landing page instead of using the 'main' page.
* Browsers and OS's restrict landing page functions, since they have been abused by marketing types
* and other low quality people. Video/Audio playback and Javascript are commonly disabled as a result.
*/
// AccessPoint; optionally change the ip address (default = 192.168.4.1)
// warning - IP addresses must be seperated with commas (,) and not decimals (.)
// #define AP_ADDRESS 192,168,4,1
// AccessPoint; Uncomment this to force the channel number, default = 1
// #define AP_CHAN 1
// Static network settings for use when connected to existing network when DHCP is unavailable/unreliable
// You must define all three: IP, Gateway and NetMask
// #define ST_IP 192,168,0,16
// #define ST_GATEWAY 192,168,0,2
// #define ST_NETMASK 255,255,255,0
// one or two optional DNS servers can be supplied, but these are not used by current code.
// #define ST_DNS1 192,168,0,2
// #define ST_DNS2 8,8,8,8
// Wifi Watchdog defines how long we spend waiting for a connection before retrying,
// and how often we check to see if we are still connected, milliseconds
// You may wish to increase this if your WiFi is slow at conencting,
// #define WIFI_WATCHDOG = 5000
/*
* Port numbers for WebUI and Stream, defaults to 80 and 81.
* Uncomment and edit as appropriate
*/
// #define HTTP_PORT 80
// #define STREAM_PORT 81
/*
* Wifi Watchdog defines how long we spend waiting for a connection before retrying,
* and how often we check to see if we are still connected, milliseconds
* You may wish to increase this if your WiFi is slow at conencting,
*/
//#define WIFI_WATCHDOG 5000
/*
* Camera Hardware Settings
*
@ -61,7 +104,6 @@ const char* password = "my-password";
* Remember to also select the board in the Boards Manager
* This is not optional
*/
#define CAMERA_MODEL_AI_THINKER // default
// #define CAMERA_MODEL_WROVER_KIT
// #define CAMERA_MODEL_ESP_EYE
@ -95,6 +137,9 @@ const char* password = "my-password";
// Define a initial lamp setting as a percentage, defaults to 0%
// #define LAMP_DEFAULT 0
// Assume we have SPIFFS/LittleFS partition, uncomment if not
// #define NO_FS
// Uncomment to enable Face Detection (+ Recognition if desired) by default
// Notes: You must set DEFAULT_RESOLUTION, above, to FRAMESIZE_CIF or lower
// Face recognition enrolements will be lost between reboots.