added GxEPD2_WiFi_CertStore_Example

examples/GxEPD2_WiFi_CertStore_Example/GxEPD2_WiFi_CertStore_Example.ino

@@ -0,0 +1,1597 @@
+// GxEPD2_WiFi_CertStore_Example : Display Library example for SPI e-paper panels from Dalian Good Display and boards from Waveshare.
+// Requires HW SPI and Adafruit_GFX. Caution: the e-paper panels require 3.3V supply AND data lines!
+//
+// Display Library based on Demo Example from Good Display: http://www.e-paper-display.com/download_list/downloadcategoryid=34&isMode=false.html
+//
+// BMP handling code extracts taken from: https://github.com/prenticedavid/MCUFRIEND_kbv/tree/master/examples/showBMP_kbv_Uno
+//
+// Author: Jean-Marc Zingg
+//
+// Version: see library.properties
+//
+// Library: https://github.com/ZinggJM/GxEPD2
+//
+// GxEPD2_WiFi_Example variant using a root certificates store on ESP8266, like a browser
+// use GxEPD2_WiFi_CertStore_Loader to download the cert.ar archive to the LittleFS of your ESP32
+// see also: https://github.com/esp8266/Arduino/tree/master/libraries/ESP8266WiFi/examples/BearSSL_CertStore
+// see also: https://forum.arduino.cc/t/https-mystery-how-to-download-like-a-browser/1055480/16
+//
+// note that BMP bitmaps are drawn at physical position in physical orientation of the screen
+
+// Supporting Arduino Forum Topics:
+// Waveshare e-paper displays with SPI: http://forum.arduino.cc/index.php?topic=487007.0
+// Good Display ePaper for Arduino: https://forum.arduino.cc/index.php?topic=436411.0
+
+// see GxEPD2_wiring_examples.h for wiring suggestions and examples
+
+// base class GxEPD2_GFX can be used to pass references or pointers to the display instance as parameter, uses ~1.2k more code
+// enable or disable GxEPD2_GFX base class
+#define ENABLE_GxEPD2_GFX 0
+
+// uncomment next line to use class GFX of library GFX_Root instead of Adafruit_GFX
+//#include <GFX.h>
+// Note: if you use this with ENABLE_GxEPD2_GFX 1:
+//       uncomment it in GxEPD2_GFX.h too, or add #include <GFX.h> before any #include <GxEPD2_GFX.h>
+
+#include <GxEPD2_BW.h>
+#include <GxEPD2_3C.h>
+#include <GxEPD2_7C.h>
+
+// NOTE: you may need to adapt or select for your wiring in the processor specific conditional compile sections below
+
+// select the display class (only one), matching the kind of display panel
+#define GxEPD2_DISPLAY_CLASS GxEPD2_BW
+//#define GxEPD2_DISPLAY_CLASS GxEPD2_3C
+//#define GxEPD2_DISPLAY_CLASS GxEPD2_7C
+
+// select the display driver class (only one) for your  panel
+//#define GxEPD2_DRIVER_CLASS GxEPD2_102     // GxEPD2_102   80x128, UC8175
+//#define GxEPD2_DRIVER_CLASS GxEPD2_150_BN // GDEP0150BN 200x200, SSD1681, TTGO T5 V2.4.1
+//#define GxEPD2_DRIVER_CLASS GxEPD2_154     // GDEP015OC1  200x200, IL3829, no longer available
+//#define GxEPD2_DRIVER_CLASS GxEPD2_154_D67 // GDEH0154D67 200x200, SSD1681
+//#define GxEPD2_DRIVER_CLASS GxEPD2_154_T8  // GDEW0154T8  152x152, UC8151 (IL0373)
+//#define GxEPD2_DRIVER_CLASS GxEPD2_154_M09 // GDEW0154M09 200x200, JD79653A
+//#define GxEPD2_DRIVER_CLASS GxEPD2_154_M10 // GDEW0154M10 152x152, UC8151D
+//#define GxEPD2_DRIVER_CLASS GxEPD2_213     // GDE0213B1   128x250, IL3895, phased out
+//#define GxEPD2_DRIVER_CLASS GxEPD2_213_B72 // GDEH0213B72 128x250, SSD1675A (IL3897)
+//#define GxEPD2_DRIVER_CLASS GxEPD2_213_B73 // GDEH0213B73 128x250, SSD1675B
+//#define GxEPD2_DRIVER_CLASS GxEPD2_213_B74 // GDEM0213B74 128x250, SSD1680
+//#define GxEPD2_DRIVER_CLASS GxEPD2_213_flex // GDEW0213I5F 104x212, UC8151 (IL0373)
+//#define GxEPD2_DRIVER_CLASS GxEPD2_213_M21 // GDEW0213M21 104x212, UC8151 (IL0373)
+//#define GxEPD2_DRIVER_CLASS GxEPD2_213_T5D // GDEW0213T5D 104x212, UC8151D
+//#define GxEPD2_DRIVER_CLASS GxEPD2_213_BN // DEPG0213BN  128x250, SSD1680, TTGO T5 V2.4.1, V2.3.1
+//#define GxEPD2_DRIVER_CLASS GxEPD2_290     // GDEH029A1   128x296, SSD1608 (IL3820)
+//#define GxEPD2_DRIVER_CLASS GxEPD2_290_T5  // GDEW029T5   128x296, UC8151 (IL0373)
+//#define GxEPD2_DRIVER_CLASS GxEPD2_290_T5D // GDEW029T5D  128x296, UC8151D
+//#define GxEPD2_DRIVER_CLASS GxEPD2_290_I6FD // GDEW029I6FD  128x296, UC8151D
+//#define GxEPD2_DRIVER_CLASS GxEPD2_290_T94 // GDEM029T94  128x296, SSD1680
+//#define GxEPD2_DRIVER_CLASS GxEPD2_290_T94_V2 // GDEM029T94  128x296, SSD1680, Waveshare 2.9" V2 variant
+//#define GxEPD2_DRIVER_CLASS GxEPD2_290_BS // DEPG0290BS  128x296, SSD1680
+//#define GxEPD2_DRIVER_CLASS GxEPD2_290_M06 // GDEW029M06  128x296, UC8151D
+//#define GxEPD2_DRIVER_CLASS GxEPD2_260     // GDEW026T0   152x296, UC8151 (IL0373)
+//#define GxEPD2_DRIVER_CLASS GxEPD2_260_M01 // GDEW026M01  152x296, UC8151 (IL0373)
+//#define GxEPD2_DRIVER_CLASS GxEPD2_266_BN // DEPG0266BN  152x296, SSD1680, TTGO T5 V2.66, TTGO T5 V2.4.1
+//#define GxEPD2_DRIVER_CLASS GxEPD2_270     // GDEW027W3   176x264, EK79652 (IL91874)
+//#define GxEPD2_DRIVER_CLASS GxEPD2_270_T91 // GDEY027T91   176x264, SSD1680
+//#define GxEPD2_DRIVER_CLASS GxEPD2_371     // GDEW0371W7  240x416, UC8171 (IL0324)
+//#define GxEPD2_DRIVER_CLASS GxEPD2_370_TC1 // ED037TC1  280x480, SSD1677, Waveshare 3.7"
+//#define GxEPD2_DRIVER_CLASS GxEPD2_420     // GDEW042T2   400x300, UC8176 (IL0398)
+//#define GxEPD2_DRIVER_CLASS GxEPD2_420_M01 // GDEW042M01  400x300, UC8176 (IL0398)
+//#define GxEPD2_DRIVER_CLASS GxEPD2_583     // GDEW0583T7  600x448, UC8179 (IL0371)
+//#define GxEPD2_DRIVER_CLASS GxEPD2_583_T8  // GDEW0583T8  648x480, GD7965
+//#define GxEPD2_DRIVER_CLASS GxEPD2_750     // GDEW075T8   640x384, UC8179 (IL0371)
+//#define GxEPD2_DRIVER_CLASS GxEPD2_750_T7  // GDEW075T7   800x480, GD7965
+//#define GxEPD2_DRIVER_CLASS GxEPD2_750_YT7  // GDEY075T7   800x480, GD7965
+//#define GxEPD2_DRIVER_CLASS GxEPD2_1160_T91 // GDEH116T91 960x640, SSD1677
+//#define GxEPD2_DRIVER_CLASS GxEPD2_1248     // GDEW1248T3  1304x984, UC8179
+// 3-color e-papers
+//#define GxEPD2_DRIVER_CLASS GxEPD2_154c     // GDEW0154Z04 200x200, IL0376F, no longer available
+//#define GxEPD2_DRIVER_CLASS GxEPD2_154_Z90c // GDEH0154Z90 200x200, SSD1681
+//#define GxEPD2_DRIVER_CLASS GxEPD2_213c     // GDEW0213Z16 104x212, UC8151 (IL0373)
+//#define GxEPD2_DRIVER_CLASS GxEPD2_213_Z19c // GDEW0213Z19 104x212, UC8151D
+//#define GxEPD2_DRIVER_CLASS GxEPD2_213_Z98c // GDEY0213Z98 122x250, SSD1680
+//#define GxEPD2_DRIVER_CLASS GxEPD2_290c     // GDEW029Z10  128x296, UC8151 (IL0373)
+//#define GxEPD2_DRIVER_CLASS GxEPD2_290_Z13c // GDEH029Z13  128x296, UC8151D
+//#define GxEPD2_DRIVER_CLASS GxEPD2_290_C90c // GDEM029C90  128x296, SSD1680
+//#define GxEPD2_DRIVER_CLASS GxEPD2_266c     // GDEY0266Z90 152x296, SSD1680
+//#define GxEPD2_DRIVER_CLASS GxEPD2_270c     // GDEW027C44  176x264, IL91874
+//#define GxEPD2_DRIVER_CLASS GxEPD2_420c     // GDEW042Z15  400x300, UC8176 (IL0398)
+//#define GxEPD2_DRIVER_CLASS GxEPD2_420c_Z21 // GDEQ042Z21  400x300, UC8276
+//#define GxEPD2_DRIVER_CLASS GxEPD2_583c     // GDEW0583Z21 600x448, UC8179 (IL0371)
+//#define GxEPD2_DRIVER_CLASS GxEPD2_583c_Z83 // GDEW0583Z83 648x480, GD7965
+//#define GxEPD2_DRIVER_CLASS GxEPD2_750c     // GDEW075Z09  640x384, UC8179 (IL0371)
+//#define GxEPD2_DRIVER_CLASS GxEPD2_750c_Z08 // GDEW075Z08  800x480, GD7965
+//#define GxEPD2_DRIVER_CLASS GxEPD2_750c_Z90 // GDEH075Z90  880x528, SSD1677
+//#define GxEPD2_DRIVER_CLASS GxEPD2_1248c    // GDEY1248Z51  1304x984, UC8179
+// 7-color e-paper
+//#define GxEPD2_DRIVER_CLASS GxEPD2_565c // Waveshare 5.65" 7-color (3C graphics)
+// grey levels parallel IF e-papers on Waveshare e-Paper IT8951 Driver HAT
+//#define GxEPD2_DRIVER_CLASS GxEPD2_it60           // ED060SCT 800x600
+//#define GxEPD2_DRIVER_CLASS GxEPD2_it60_1448x1072 // ED060KC1 1448x1072
+//#define GxEPD2_DRIVER_CLASS GxEPD2_it78_1872x1404 // ED078KC2 1872x1404
+//#define GxEPD2_DRIVER_CLASS GxEPD2_it103_1872x1404 // ES103TC1 1872x1404
+
+// SS is usually used for CS. define here for easy change
+#ifndef EPD_CS
+#define EPD_CS SS
+#endif
+
+// somehow there should be an easier way to do this
+#define GxEPD2_BW_IS_GxEPD2_BW true
+#define GxEPD2_3C_IS_GxEPD2_3C true
+#define GxEPD2_7C_IS_GxEPD2_7C true
+#define GxEPD2_1248_IS_GxEPD2_1248 true
+#define GxEPD2_1248c_IS_GxEPD2_1248c true
+#define IS_GxEPD(c, x) (c##x)
+#define IS_GxEPD2_BW(x) IS_GxEPD(GxEPD2_BW_IS_, x)
+#define IS_GxEPD2_3C(x) IS_GxEPD(GxEPD2_3C_IS_, x)
+#define IS_GxEPD2_7C(x) IS_GxEPD(GxEPD2_7C_IS_, x)
+#define IS_GxEPD2_1248(x) IS_GxEPD(GxEPD2_1248_IS_, x)
+#define IS_GxEPD2_1248c(x) IS_GxEPD(GxEPD2_1248c_IS_, x)
+
+#if defined (ESP8266)
+#define MAX_DISPLAY_BUFFER_SIZE (81920ul-34000ul-35000ul) // ~34000 base use, WiFiClientSecure seems to need about 35k more to work (with CertStore)
+// for site people.math.sc.edu an increased RX buffer is required for timely decodes, client.setBufferSizes(8192, 4096); // may help. needs more space:
+//#define MAX_DISPLAY_BUFFER_SIZE (81920ul-34000ul-37000ul) // ~34000 base use, WiFiClientSecure seems to need about 37k more to work (with CertStore)
+#if IS_GxEPD2_BW(GxEPD2_DISPLAY_CLASS)
+#define MAX_HEIGHT(EPD) (EPD::HEIGHT <= MAX_DISPLAY_BUFFER_SIZE / (EPD::WIDTH / 8) ? EPD::HEIGHT : MAX_DISPLAY_BUFFER_SIZE / (EPD::WIDTH / 8))
+#elif IS_GxEPD2_3C(GxEPD2_DISPLAY_CLASS)
+#define MAX_HEIGHT(EPD) (EPD::HEIGHT <= (MAX_DISPLAY_BUFFER_SIZE / 2) / (EPD::WIDTH / 8) ? EPD::HEIGHT : (MAX_DISPLAY_BUFFER_SIZE / 2) / (EPD::WIDTH / 8))
+#elif IS_GxEPD2_7C(GxEPD2_DISPLAY_CLASS)
+#define MAX_HEIGHT(EPD) (EPD::HEIGHT <= (MAX_DISPLAY_BUFFER_SIZE) / (EPD::WIDTH / 2) ? EPD::HEIGHT : (MAX_DISPLAY_BUFFER_SIZE) / (EPD::WIDTH / 2))
+#endif
+// adapt the constructor parameters to your wiring
+GxEPD2_DISPLAY_CLASS<GxEPD2_DRIVER_CLASS, MAX_HEIGHT(GxEPD2_DRIVER_CLASS)> display(GxEPD2_DRIVER_CLASS(/*CS=D8*/ EPD_CS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4));
+// mapping of Waveshare e-Paper ESP8266 Driver Board, new version
+//GxEPD2_DISPLAY_CLASS<GxEPD2_DRIVER_CLASS, MAX_HEIGHT(GxEPD2_DRIVER_CLASS)> display(GxEPD2_DRIVER_CLASS(/*CS=15*/ EPD_CS, /*DC=4*/ 4, /*RST=2*/ 2, /*BUSY=5*/ 5));
+// mapping of Waveshare e-Paper ESP8266 Driver Board, old version
+//GxEPD2_DISPLAY_CLASS<GxEPD2_DRIVER_CLASS, MAX_HEIGHT(GxEPD2_DRIVER_CLASS)> display(GxEPD2_DRIVER_CLASS(/*CS=15*/ EPD_CS, /*DC=4*/ 4, /*RST=5*/ 5, /*BUSY=16*/ 16));
+#endif
+
+#if defined(ESP32)
+#define MAX_DISPLAY_BUFFER_SIZE 65536ul // e.g.
+#if IS_GxEPD2_BW(GxEPD2_DISPLAY_CLASS)
+#define MAX_HEIGHT(EPD) (EPD::HEIGHT <= MAX_DISPLAY_BUFFER_SIZE / (EPD::WIDTH / 8) ? EPD::HEIGHT : MAX_DISPLAY_BUFFER_SIZE / (EPD::WIDTH / 8))
+#elif IS_GxEPD2_3C(GxEPD2_DISPLAY_CLASS)
+#define MAX_HEIGHT(EPD) (EPD::HEIGHT <= (MAX_DISPLAY_BUFFER_SIZE / 2) / (EPD::WIDTH / 8) ? EPD::HEIGHT : (MAX_DISPLAY_BUFFER_SIZE / 2) / (EPD::WIDTH / 8))
+#elif IS_GxEPD2_7C(GxEPD2_DISPLAY_CLASS)
+#define MAX_HEIGHT(EPD) (EPD::HEIGHT <= (MAX_DISPLAY_BUFFER_SIZE) / (EPD::WIDTH / 2) ? EPD::HEIGHT : (MAX_DISPLAY_BUFFER_SIZE) / (EPD::WIDTH / 2))
+#endif
+// adapt the constructor parameters to your wiring
+#if !IS_GxEPD2_1248(GxEPD2_DRIVER_CLASS) && !IS_GxEPD2_1248c(GxEPD2_DRIVER_CLASS)
+#if defined(ARDUINO_LOLIN_D32_PRO)
+GxEPD2_DISPLAY_CLASS<GxEPD2_DRIVER_CLASS, MAX_HEIGHT(GxEPD2_DRIVER_CLASS)> display(GxEPD2_DRIVER_CLASS(/*CS=5*/ EPD_CS, /*DC=*/ 0, /*RST=*/ 2, /*BUSY=*/ 15)); // my LOLIN_D32_PRO proto board
+#else
+GxEPD2_DISPLAY_CLASS<GxEPD2_DRIVER_CLASS, MAX_HEIGHT(GxEPD2_DRIVER_CLASS)> display(GxEPD2_DRIVER_CLASS(/*CS=5*/ EPD_CS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4)); // my suggested wiring and proto board
+//GxEPD2_DISPLAY_CLASS<GxEPD2_DRIVER_CLASS, MAX_HEIGHT(GxEPD2_DRIVER_CLASS)> display(GxEPD2_DRIVER_CLASS(/*CS=5*/ 5, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4)); // LILYGO_T5_V2.4.1
+//GxEPD2_DISPLAY_CLASS<GxEPD2_DRIVER_CLASS, MAX_HEIGHT(GxEPD2_DRIVER_CLASS)> display(GxEPD2_DRIVER_CLASS(/*CS=5*/ EPD_CS, /*DC=*/ 19, /*RST=*/ 4, /*BUSY=*/ 34)); // LILYGO® TTGO T5 2.66
+//GxEPD2_DISPLAY_CLASS<GxEPD2_DRIVER_CLASS, MAX_HEIGHT(GxEPD2_DRIVER_CLASS)> display(GxEPD2_DRIVER_CLASS(/*CS=5*/ EPD_CS, /*DC=*/ 2, /*RST=*/ 0, /*BUSY=*/ 4)); // e.g. TTGO T8 ESP32-WROVER
+#endif
+#else // GxEPD2_1248 or GxEPD2_1248c
+// Waveshare 12.48 b/w or b/w/r SPI display board and frame or Good Display 12.48 b/w panel GDEW1248T3 or b/w/r panel GDEY1248Z51
+// general constructor for use with all parameters, e.g. for Waveshare ESP32 driver board mounted on connection board
+GxEPD2_DISPLAY_CLASS < GxEPD2_DRIVER_CLASS, MAX_HEIGHT(GxEPD2_DRIVER_CLASS) > display(GxEPD2_DRIVER_CLASS(/*sck=*/ 13, /*miso=*/ 12, /*mosi=*/ 14,
+    /*cs_m1=*/ 23, /*cs_s1=*/ 22, /*cs_m2=*/ 16, /*cs_s2=*/ 19,
+    /*dc1=*/ 25, /*dc2=*/ 17, /*rst1=*/ 33, /*rst2=*/ 5,
+    /*busy_m1=*/ 32, /*busy_s1=*/ 26, /*busy_m2=*/ 18, /*busy_s2=*/ 4));
+#endif
+#endif
+
+#if defined (ESP8266)
+#include <ESP8266WiFi.h>
+#include <CertStoreBearSSL.h>
+#include <time.h>
+#include <FS.h>
+#include <LittleFS.h>
+#endif
+
+#include <WiFiClient.h>
+#include <WiFiClientSecure.h>
+
+#if defined (ESP8266)
+// A single, global CertStore which can be used by all
+// connections.  Needs to stay live the entire time any of
+// the WiFiClientBearSSLs are present.
+BearSSL::CertStore certStore;
+const char* certificate_rawcontent = 0;
+#else
+#include "GxEPD2_github_raw_certs.h"
+const char* certificate_rawcontent = cert_DigiCert_TLS_RSA_SHA256_2020_CA1;
+#pragma GCC warning "no CertStore for this target"
+//#warning "no CertStore for this target"
+#endif
+
+const char* ssid     = "........";
+const char* password = "........";
+const int httpPort  = 80;
+const int httpsPort = 443;
+
+const char* fp_rawcontent     = "8F 0E 79 24 71 C5 A7 D2 A7 46 76 30 C1 3C B7 2A 13 B0 01 B2"; // as of 29.7.2022
+
+const char* host_rawcontent   = "raw.githubusercontent.com";
+const char* path_rawcontent   = "/ZinggJM/GxEPD2/master/extras/bitmaps/";
+const char* path_prenticedavid   = "/prenticedavid/MCUFRIEND_kbv/master/extras/bitmaps/";
+const char* path_waveshare_c  = "/waveshare/e-Paper/master/RaspberryPi_JetsonNano/c/pic/";
+const char* path_waveshare_py = "/waveshare/e-Paper/master/RaspberryPi_JetsonNano/python/pic/";
+const char* path_Burkardt     = "https://people.math.sc.edu/Burkardt/data/bmp/";
+const char* fp_people_cas     = "99:6C:B7:72:CC:ED:96:82:49:2D:B2:78:71:00:14:BA:02:8E:FF:BF";
+const char* host_people_cas_sc_edu = "people.math.sc.edu";
+
+// note that BMP bitmaps are drawn at physical position in physical orientation of the screen
+void showBitmapFrom_HTTP(const char* host, const char* path, const char* filename, int16_t x, int16_t y, bool with_color = true);
+void showBitmapFrom_HTTPS(const char* host, const char* path, const char* filename, const char* fingerprint, int16_t x, int16_t y, bool with_color = true,
+                          const char* certificate = certificate_rawcontent);
+
+// draws BMP bitmap according to set orientation
+void showBitmapFrom_HTTP_Buffered(const char* host, const char* path, const char* filename, int16_t x, int16_t y, bool with_color = true);
+void showBitmapFrom_HTTPS_Buffered(const char* host, const char* path, const char* filename, const char* fingerprint, int16_t x, int16_t y, bool with_color = true,
+                                   const char* certificate = certificate_rawcontent);
+
+void setup()
+{
+  Serial.begin(115200);
+  Serial.println();
+  Serial.println("GxEPD2_WiFi_Example");
+
+  display.init(115200);
+
+#ifdef REMAP_SPI_FOR_WAVESHARE_ESP32_DRIVER_BOARD
+  SPI.end(); // release standard SPI pins, e.g. SCK(18), MISO(19), MOSI(23), SS(5)
+  //SPI: void begin(int8_t sck=-1, int8_t miso=-1, int8_t mosi=-1, int8_t ss=-1);
+  SPI.begin(13, 12, 14, 15); // map and init SPI pins SCK(13), MISO(12), MOSI(14), SS(15)
+#endif
+
+#ifdef RE_INIT_NEEDED
+  WiFi.persistent(true);
+  WiFi.mode(WIFI_STA); // switch off AP
+  WiFi.setAutoConnect(true);
+  WiFi.setAutoReconnect(true);
+  WiFi.disconnect();
+#endif
+
+  if (!WiFi.getAutoConnect() || ( WiFi.getMode() != WIFI_STA) || ((WiFi.SSID() != ssid) && String(ssid) != "........"))
+  {
+    Serial.println();
+    Serial.print("WiFi.getAutoConnect()=");
+    Serial.println(WiFi.getAutoConnect());
+    Serial.print("WiFi.SSID()=");
+    Serial.println(WiFi.SSID());
+    WiFi.mode(WIFI_STA); // switch off AP
+    Serial.print("Connecting to ");
+    Serial.println(ssid);
+    WiFi.begin(ssid, password);
+  }
+  int ConnectTimeout = 30; // 15 seconds
+  while (WiFi.status() != WL_CONNECTED)
+  {
+    delay(500);
+    Serial.print(".");
+    Serial.print(WiFi.status());
+    if (--ConnectTimeout <= 0)
+    {
+      Serial.println();
+      Serial.println("WiFi connect timeout");
+      return;
+    }
+  }
+  Serial.println();
+  Serial.println("WiFi connected");
+
+  // Print the IP address
+  Serial.println(WiFi.localIP());
+
+  setClock();
+
+#if defined (ESP8266)
+
+  LittleFS.begin();
+
+  int numCerts = certStore.initCertStore(LittleFS, PSTR("/certs.idx"), PSTR("/certs.ar"));
+  Serial.printf("Number of CA certs read: %d\n", numCerts);
+  if (numCerts == 0)
+  {
+    Serial.printf("No certs found. Did you run certs-from-mozilla.py and upload the LittleFS directory before running?\n");
+    return; // Can't connect to anything w/o certs!
+  }
+
+#endif
+
+  if ((display.epd2.panel == GxEPD2::GDEW0154Z04) || (display.epd2.panel == GxEPD2::ACeP565) || false)
+  {
+    drawBitmapsBuffered_200x200();
+    drawBitmapsBuffered_other();
+    drawBitmapsBuffered_7C();
+  }
+  else
+  {
+    drawBitmaps_200x200();
+    drawBitmaps_other();
+  }
+
+  //drawBitmaps_test();
+  //drawBitmapsBuffered_test();
+
+  Serial.println("GxEPD2_WiFi_Example done");
+}
+
+void loop(void)
+{
+}
+
+void drawBitmaps_200x200()
+{
+  int16_t x = (display.width() - 200) / 2;
+  int16_t y = (display.height() - 200) / 2;
+  showBitmapFrom_HTTPS(host_rawcontent, path_rawcontent, "logo200x200.bmp", fp_rawcontent, x, y);
+  delay(2000);
+  showBitmapFrom_HTTPS(host_rawcontent, path_rawcontent, "first200x200.bmp", fp_rawcontent, x, y);
+  delay(2000);
+  showBitmapFrom_HTTPS(host_rawcontent, path_rawcontent, "second200x200.bmp", fp_rawcontent, x, y);
+  delay(2000);
+  showBitmapFrom_HTTPS(host_rawcontent, path_rawcontent, "third200x200.bmp", fp_rawcontent, x, y);
+  delay(2000);
+  showBitmapFrom_HTTPS(host_rawcontent, path_rawcontent, "fourth200x200.bmp", fp_rawcontent, x, y);
+  delay(2000);
+  showBitmapFrom_HTTPS(host_rawcontent, path_rawcontent, "fifth200x200.bmp", fp_rawcontent, x, y);
+  delay(2000);
+  showBitmapFrom_HTTPS(host_rawcontent, path_rawcontent, "sixth200x200.bmp", fp_rawcontent, x, y);
+  delay(2000);
+  showBitmapFrom_HTTPS(host_rawcontent, path_rawcontent, "seventh200x200.bmp", fp_rawcontent, x, y);
+  delay(2000);
+  showBitmapFrom_HTTPS(host_rawcontent, path_rawcontent, "eighth200x200.bmp", fp_rawcontent, x, y);
+  delay(2000);
+}
+
+void drawBitmaps_other()
+{
+  int16_t w2 = display.width() / 2;
+  int16_t h2 = display.height() / 2;
+  showBitmapFrom_HTTP("www.packescape.com", "/img/assets/", "IniciMenusTV2.bmp", w2 - 200, h2 - 150, false);
+  delay(2000);
+  showBitmapFrom_HTTP("www.squix.org", "/blog/wunderground/", "chanceflurries.bmp", w2 - 50, h2 - 50, false);
+  delay(2000);
+  showBitmapFrom_HTTPS(host_rawcontent, path_prenticedavid, "betty_1.bmp", fp_rawcontent, w2 - 100, h2 - 160);
+  delay(2000);
+  showBitmapFrom_HTTPS(host_rawcontent, path_prenticedavid, "betty_4.bmp", fp_rawcontent, w2 - 102, h2 - 126);
+  delay(2000);
+  showBitmapFrom_HTTPS(host_rawcontent, path_prenticedavid, "marilyn_240x240x8.bmp", fp_rawcontent, w2 - 120, h2 - 120);
+  delay(2000);
+  showBitmapFrom_HTTPS(host_rawcontent, path_prenticedavid, "miniwoof.bmp", fp_rawcontent, w2 - 60, h2 - 80);
+  delay(2000);
+  showBitmapFrom_HTTPS(host_rawcontent, path_prenticedavid, "test.bmp", fp_rawcontent, w2 - 120, h2 - 160);
+  delay(2000);
+  showBitmapFrom_HTTPS(host_rawcontent, path_prenticedavid, "tiger.bmp", fp_rawcontent, w2 - 160, h2 - 120);
+  delay(2000);
+  showBitmapFrom_HTTPS(host_rawcontent, path_prenticedavid, "tiger_178x160x4.bmp", fp_rawcontent, w2 - 89, h2 - 80);
+  delay(2000);
+  showBitmapFrom_HTTPS(host_rawcontent, path_prenticedavid, "tiger_240x317x4.bmp", fp_rawcontent, w2 - 120, h2 - 160);
+  delay(2000);
+  showBitmapFrom_HTTPS(host_rawcontent, path_prenticedavid, "tiger_320x200x24.bmp", fp_rawcontent, w2 - 160, h2 - 100);
+  delay(2000);
+  showBitmapFrom_HTTPS(host_rawcontent, path_prenticedavid, "tiger16T.bmp", fp_rawcontent, w2 - 160, h2 - 100);
+  delay(2000);
+  showBitmapFrom_HTTPS(host_rawcontent, path_prenticedavid, "woof.bmp", fp_rawcontent, w2 - 100, h2 - 100);
+  delay(2000);
+}
+
+void drawBitmaps_test()
+{
+#if defined (ESP8266)
+  showBitmapFrom_HTTPS_Buffered(host_people_cas_sc_edu, path_Burkardt, "lena.bmp", 0, 0, 0, true, 0); // connection ok with CertStore
+#endif
+  int16_t w2 = display.width() / 2;
+  int16_t h2 = display.height() / 2;
+  showBitmapFrom_HTTPS(host_rawcontent, path_prenticedavid, "betty_4.bmp", fp_rawcontent, w2 - 102, h2 - 126);
+  delay(2000);
+  showBitmapFrom_HTTPS(host_rawcontent, path_rawcontent, "output5.bmp", fp_rawcontent, 0, 0);
+  delay(2000);
+  showBitmapFrom_HTTPS(host_rawcontent, path_rawcontent, "output6.bmp", fp_rawcontent, 0, 0);
+  delay(2000);
+  showBitmapFrom_HTTPS(host_rawcontent, path_rawcontent, "tractor_1.bmp", fp_rawcontent, 0, 0);
+  delay(2000);
+  showBitmapFrom_HTTPS(host_rawcontent, path_rawcontent, "tractor_4.bmp", fp_rawcontent, 0, 0);
+  delay(2000);
+  showBitmapFrom_HTTPS(host_rawcontent, path_rawcontent, "tractor_8.bmp", fp_rawcontent, 0, 0);
+  delay(2000);
+  showBitmapFrom_HTTPS(host_rawcontent, path_rawcontent, "tractor_11.bmp", fp_rawcontent, 0, 0);
+  delay(2000);
+  showBitmapFrom_HTTPS(host_rawcontent, path_rawcontent, "tractor_44.bmp", fp_rawcontent, 0, 0);
+  delay(2000);
+  showBitmapFrom_HTTPS(host_rawcontent, path_rawcontent, "tractor_88.bmp", fp_rawcontent, 0, 0);
+  delay(2000);
+  //showBitmapFrom_HTTPS(host_rawcontent, path_rawcontent, "liberato640x384.bmp", fp_rawcontent, 0, 0);
+  //delay(2000);
+}
+
+void drawBitmapsBuffered_200x200()
+{
+  int16_t x = (display.width() - 200) / 2;
+  int16_t y = (display.height() - 200) / 2;
+  showBitmapFrom_HTTPS_Buffered(host_rawcontent, path_rawcontent, "logo200x200.bmp", fp_rawcontent, x, y);
+  delay(2000);
+  showBitmapFrom_HTTPS_Buffered(host_rawcontent, path_rawcontent, "first200x200.bmp", fp_rawcontent, x, y);
+  delay(2000);
+  showBitmapFrom_HTTPS_Buffered(host_rawcontent, path_rawcontent, "second200x200.bmp", fp_rawcontent, x, y);
+  delay(2000);
+  showBitmapFrom_HTTPS_Buffered(host_rawcontent, path_rawcontent, "third200x200.bmp", fp_rawcontent, x, y);
+  delay(2000);
+  showBitmapFrom_HTTPS_Buffered(host_rawcontent, path_rawcontent, "fourth200x200.bmp", fp_rawcontent, x, y);
+  delay(2000);
+  showBitmapFrom_HTTPS_Buffered(host_rawcontent, path_rawcontent, "fifth200x200.bmp", fp_rawcontent, x, y);
+  delay(2000);
+  showBitmapFrom_HTTPS_Buffered(host_rawcontent, path_rawcontent, "sixth200x200.bmp", fp_rawcontent, x, y);
+  delay(2000);
+  showBitmapFrom_HTTPS_Buffered(host_rawcontent, path_rawcontent, "seventh200x200.bmp", fp_rawcontent, x, y);
+  delay(2000);
+  showBitmapFrom_HTTPS_Buffered(host_rawcontent, path_rawcontent, "eighth200x200.bmp", fp_rawcontent, x, y);
+  delay(2000);
+}
+
+void drawBitmapsBuffered_other()
+{
+  int16_t w2 = display.width() / 2;
+  int16_t h2 = display.height() / 2;
+  showBitmapFrom_HTTP_Buffered("www.squix.org", "/blog/wunderground/", "chanceflurries.bmp", w2 - 50, h2 - 50, false);
+  delay(2000);
+  //showBitmapFrom_HTTPS_Buffered(host_rawcontent, path_prenticedavid, "betty_1.bmp", fp_rawcontent, w2 - 100, h2 - 160);
+  delay(2000);
+  showBitmapFrom_HTTPS_Buffered(host_rawcontent, path_prenticedavid, "betty_4.bmp", fp_rawcontent, w2 - 102, h2 - 126);
+  delay(2000);
+  showBitmapFrom_HTTPS_Buffered(host_rawcontent, path_prenticedavid, "marilyn_240x240x8.bmp", fp_rawcontent, w2 - 120, h2 - 120);
+  delay(2000);
+  showBitmapFrom_HTTPS_Buffered(host_rawcontent, path_prenticedavid, "miniwoof.bmp", fp_rawcontent, w2 - 60, h2 - 80);
+  delay(2000);
+  showBitmapFrom_HTTPS_Buffered(host_rawcontent, path_prenticedavid, "test.bmp", fp_rawcontent, w2 - 120, h2 - 160);
+  delay(2000);
+  showBitmapFrom_HTTPS_Buffered(host_rawcontent, path_prenticedavid, "tiger.bmp", fp_rawcontent, w2 - 160, h2 - 120);
+  delay(2000);
+  showBitmapFrom_HTTPS_Buffered(host_rawcontent, path_prenticedavid, "tiger_178x160x4.bmp", fp_rawcontent, w2 - 89, h2 - 80);
+  delay(2000);
+  showBitmapFrom_HTTPS_Buffered(host_rawcontent, path_prenticedavid, "tiger_240x317x4.bmp", fp_rawcontent, w2 - 120, h2 - 160);
+  delay(2000);
+  showBitmapFrom_HTTPS_Buffered(host_rawcontent, path_prenticedavid, "tiger_320x200x24.bmp", fp_rawcontent, w2 - 160, h2 - 100);
+  delay(2000);
+  showBitmapFrom_HTTPS_Buffered(host_rawcontent, path_prenticedavid, "tiger16T.bmp", fp_rawcontent, w2 - 160, h2 - 100);
+  delay(2000);
+  showBitmapFrom_HTTPS_Buffered(host_rawcontent, path_prenticedavid, "woof.bmp", fp_rawcontent, w2 - 100, h2 - 100);
+  delay(2000);
+}
+
+void drawBitmapsBuffered_7C()
+{
+  if (display.epd2.panel == GxEPD2::ACeP565)
+  {
+    showBitmapFrom_HTTPS_Buffered(host_rawcontent, path_waveshare_c, "5in65f.bmp", fp_rawcontent, 0, 0);
+    delay(2000);
+    showBitmapFrom_HTTPS_Buffered(host_rawcontent, path_waveshare_c, "5in65f2.bmp", fp_rawcontent, 0, 0);
+    delay(2000);
+    showBitmapFrom_HTTPS_Buffered(host_rawcontent, path_waveshare_c, "5in65f3.bmp", fp_rawcontent, 0, 0);
+    delay(2000);
+    showBitmapFrom_HTTPS_Buffered(host_rawcontent, path_waveshare_c, "5in65f4.bmp", fp_rawcontent, 0, 0);
+    delay(2000);
+    showBitmapFrom_HTTPS_Buffered(host_rawcontent, path_waveshare_py, "5in65f4.bmp", fp_rawcontent, 0, 0);
+    delay(2000);
+    showBitmapFrom_HTTPS_Buffered(host_rawcontent, path_waveshare_py, "N-Color1.bmp", fp_rawcontent, 0, 0);
+    delay(2000);
+  }
+}
+
+void drawBitmapsBuffered_test()
+{
+#if defined (ESP8266)
+  showBitmapFrom_HTTPS_Buffered(host_people_cas_sc_edu, path_Burkardt, "lena.bmp", 0, 0, 0, true, 0); // connection ok with CertStore
+#endif
+  int16_t w2 = display.width() / 2;
+  int16_t h2 = display.height() / 2;
+  showBitmapFrom_HTTPS_Buffered(host_rawcontent, path_prenticedavid, "betty_4.bmp", fp_rawcontent, w2 - 102, h2 - 126);
+  delay(2000);
+}
+
+static const uint16_t input_buffer_pixels = 800; // may affect performance
+
+static const uint16_t max_row_width = 1872; // for up to 7.8" display 1872x1404
+static const uint16_t max_palette_pixels = 256; // for depth <= 8
+
+uint8_t input_buffer[3 * input_buffer_pixels]; // up to depth 24
+uint8_t output_row_mono_buffer[max_row_width / 8]; // buffer for at least one row of b/w bits
+uint8_t output_row_color_buffer[max_row_width / 8]; // buffer for at least one row of color bits
+uint8_t mono_palette_buffer[max_palette_pixels / 8]; // palette buffer for depth <= 8 b/w
+uint8_t color_palette_buffer[max_palette_pixels / 8]; // palette buffer for depth <= 8 c/w
+uint16_t rgb_palette_buffer[max_palette_pixels]; // palette buffer for depth <= 8 for buffered graphics, needed for 7-color display
+
+void showBitmapFrom_HTTP(const char* host, const char* path, const char* filename, int16_t x, int16_t y, bool with_color)
+{
+  WiFiClient client;
+  bool connection_ok = false;
+  bool valid = false; // valid format to be handled
+  bool flip = true; // bitmap is stored bottom-to-top
+  uint32_t startTime = millis();
+  if ((x >= display.epd2.WIDTH) || (y >= display.epd2.HEIGHT)) return;
+  Serial.println(); Serial.print("downloading file \""); Serial.print(filename);  Serial.println("\"");
+  Serial.print("connecting to "); Serial.println(host);
+  if (!client.connect(host, httpPort))
+  {
+    Serial.println("connection failed");
+    return;
+  }
+  Serial.print("requesting URL: ");
+  Serial.println(String("http://") + host + path + filename);
+  client.print(String("GET ") + path + filename + " HTTP/1.1\r\n" +
+               "Host: " + host + "\r\n" +
+               "User-Agent: GxEPD2_WiFi_Example\r\n" +
+               "Connection: close\r\n\r\n");
+  Serial.println("request sent");
+  while (client.connected())
+  {
+    String line = client.readStringUntil('\n');
+    if (!connection_ok)
+    {
+      connection_ok = line.startsWith("HTTP/1.1 200 OK");
+      if (connection_ok) Serial.println(line);
+      //if (!connection_ok) Serial.println(line);
+    }
+    if (!connection_ok) Serial.println(line);
+    //Serial.println(line);
+    if (line == "\r")
+    {
+      Serial.println("headers received");
+      break;
+    }
+  }
+  if (!connection_ok) return;
+  // Parse BMP header
+  if (read16(client) == 0x4D42) // BMP signature
+  {
+    uint32_t fileSize = read32(client);
+    uint32_t creatorBytes = read32(client); (void)creatorBytes; //unused
+    uint32_t imageOffset = read32(client); // Start of image data
+    uint32_t headerSize = read32(client);
+    uint32_t width  = read32(client);
+    int32_t height = (int32_t) read32(client);
+    uint16_t planes = read16(client);
+    uint16_t depth = read16(client); // bits per pixel
+    uint32_t format = read32(client);
+    uint32_t bytes_read = 7 * 4 + 3 * 2; // read so far
+    if ((planes == 1) && ((format == 0) || (format == 3))) // uncompressed is handled, 565 also
+    {
+      Serial.print("File size: "); Serial.println(fileSize);
+      Serial.print("Image Offset: "); Serial.println(imageOffset);
+      Serial.print("Header size: "); Serial.println(headerSize);
+      Serial.print("Bit Depth: "); Serial.println(depth);
+      Serial.print("Image size: ");
+      Serial.print(width);
+      Serial.print('x');
+      Serial.println(height);
+      // BMP rows are padded (if needed) to 4-byte boundary
+      uint32_t rowSize = (width * depth / 8 + 3) & ~3;
+      if (depth < 8) rowSize = ((width * depth + 8 - depth) / 8 + 3) & ~3;
+      if (height < 0)
+      {
+        height = -height;
+        flip = false;
+      }
+      uint16_t w = width;
+      uint16_t h = height;
+      if ((x + w - 1) >= display.epd2.WIDTH)  w = display.epd2.WIDTH  - x;
+      if ((y + h - 1) >= display.epd2.HEIGHT) h = display.epd2.HEIGHT - y;
+      if (w <= max_row_width) // handle with direct drawing
+      {
+        valid = true;
+        uint8_t bitmask = 0xFF;
+        uint8_t bitshift = 8 - depth;
+        uint16_t red, green, blue;
+        bool whitish = false;
+        bool colored = false;
+        if (depth == 1) with_color = false;
+        if (depth <= 8)
+        {
+          if (depth < 8) bitmask >>= depth;
+          //bytes_read += skip(client, 54 - bytes_read); //palette is always @ 54
+          bytes_read += skip(client, imageOffset - (4 << depth) - bytes_read); // 54 for regular, diff for colorsimportant
+          for (uint16_t pn = 0; pn < (1 << depth); pn++)
+          {
+            blue  = client.read();
+            green = client.read();
+            red   = client.read();
+            client.read();
+            bytes_read += 4;
+            whitish = with_color ? ((red > 0x80) && (green > 0x80) && (blue > 0x80)) : ((red + green + blue) > 3 * 0x80); // whitish
+            colored = (red > 0xF0) || ((green > 0xF0) && (blue > 0xF0)); // reddish or yellowish?
+            if (0 == pn % 8) mono_palette_buffer[pn / 8] = 0;
+            mono_palette_buffer[pn / 8] |= whitish << pn % 8;
+            if (0 == pn % 8) color_palette_buffer[pn / 8] = 0;
+            color_palette_buffer[pn / 8] |= colored << pn % 8;
+          }
+        }
+        display.clearScreen();
+        uint32_t rowPosition = flip ? imageOffset + (height - h) * rowSize : imageOffset;
+        //Serial.print("skip "); Serial.println(rowPosition - bytes_read);
+        bytes_read += skip(client, rowPosition - bytes_read);
+        for (uint16_t row = 0; row < h; row++, rowPosition += rowSize) // for each line
+        {
+          if (!connection_ok || !(client.connected() || client.available())) break;
+          delay(1); // yield() to avoid WDT
+          uint32_t in_remain = rowSize;
+          uint32_t in_idx = 0;
+          uint32_t in_bytes = 0;
+          uint8_t in_byte = 0; // for depth <= 8
+          uint8_t in_bits = 0; // for depth <= 8
+          uint8_t out_byte = 0xFF; // white (for w%8!=0 border)
+          uint8_t out_color_byte = 0xFF; // white (for w%8!=0 border)
+          uint32_t out_idx = 0;
+          for (uint16_t col = 0; col < w; col++) // for each pixel
+          {
+            yield();
+            if (!connection_ok || !(client.connected() || client.available())) break;
+            // Time to read more pixel data?
+            if (in_idx >= in_bytes) // ok, exact match for 24bit also (size IS multiple of 3)
+            {
+              uint32_t get = in_remain > sizeof(input_buffer) ? sizeof(input_buffer) : in_remain;
+              uint32_t got = read8n(client, input_buffer, get);
+              while ((got < get) && connection_ok)
+              {
+                //Serial.print("got "); Serial.print(got); Serial.print(" < "); Serial.print(get); Serial.print(" @ "); Serial.println(bytes_read);
+                uint32_t gotmore = read8n(client, input_buffer + got, get - got);
+                got += gotmore;
+                connection_ok = gotmore > 0;
+              }
+              in_bytes = got;
+              in_remain -= got;
+              bytes_read += got;
+            }
+            if (!connection_ok)
+            {
+              Serial.print("Error: got no more after "); Serial.print(bytes_read); Serial.println(" bytes read!");
+              break;
+            }
+            switch (depth)
+            {
+              case 24:
+                blue = input_buffer[in_idx++];
+                green = input_buffer[in_idx++];
+                red = input_buffer[in_idx++];
+                whitish = with_color ? ((red > 0x80) && (green > 0x80) && (blue > 0x80)) : ((red + green + blue) > 3 * 0x80); // whitish
+                colored = (red > 0xF0) || ((green > 0xF0) && (blue > 0xF0)); // reddish or yellowish?
+                break;
+              case 16:
+                {
+                  uint8_t lsb = input_buffer[in_idx++];
+                  uint8_t msb = input_buffer[in_idx++];
+                  if (format == 0) // 555
+                  {
+                    blue  = (lsb & 0x1F) << 3;
+                    green = ((msb & 0x03) << 6) | ((lsb & 0xE0) >> 2);
+                    red   = (msb & 0x7C) << 1;
+                  }
+                  else // 565
+                  {
+                    blue  = (lsb & 0x1F) << 3;
+                    green = ((msb & 0x07) << 5) | ((lsb & 0xE0) >> 3);
+                    red   = (msb & 0xF8);
+                  }
+                  whitish = with_color ? ((red > 0x80) && (green > 0x80) && (blue > 0x80)) : ((red + green + blue) > 3 * 0x80); // whitish
+                  colored = (red > 0xF0) || ((green > 0xF0) && (blue > 0xF0)); // reddish or yellowish?
+                }
+                break;
+              case 1:
+              case 4:
+              case 8:
+                {
+                  if (0 == in_bits)
+                  {
+                    in_byte = input_buffer[in_idx++];
+                    in_bits = 8;
+                  }
+                  uint16_t pn = (in_byte >> bitshift) & bitmask;
+                  whitish = mono_palette_buffer[pn / 8] & (0x1 << pn % 8);
+                  colored = color_palette_buffer[pn / 8] & (0x1 << pn % 8);
+                  in_byte <<= depth;
+                  in_bits -= depth;
+                }
+                break;
+            }
+            if (whitish)
+            {
+              // keep white
+            }
+            else if (colored && with_color)
+            {
+              out_color_byte &= ~(0x80 >> col % 8); // colored
+            }
+            else
+            {
+              out_byte &= ~(0x80 >> col % 8); // black
+            }
+            if ((7 == col % 8) || (col == w - 1)) // write that last byte! (for w%8!=0 border)
+            {
+              output_row_color_buffer[out_idx] = out_color_byte;
+              output_row_mono_buffer[out_idx++] = out_byte;
+              out_byte = 0xFF; // white (for w%8!=0 border)
+              out_color_byte = 0xFF; // white (for w%8!=0 border)
+            }
+          } // end pixel
+          int16_t yrow = y + (flip ? h - row - 1 : row);
+          display.writeImage(output_row_mono_buffer, output_row_color_buffer, x, yrow, w, 1);
+        } // end line
+        Serial.print("downloaded in ");
+        Serial.print(millis() - startTime);
+        Serial.println(" ms");
+        display.refresh();
+      }
+      Serial.print("bytes read "); Serial.println(bytes_read);
+    }
+  }
+  client.stop();
+  if (!valid)
+  {
+    Serial.println("bitmap format not handled.");
+  }
+}
+
+void drawBitmapFrom_HTTP_ToBuffer(const char* host, const char* path, const char* filename, int16_t x, int16_t y, bool with_color)
+{
+  WiFiClient client;
+  bool connection_ok = false;
+  bool valid = false; // valid format to be handled
+  bool flip = true; // bitmap is stored bottom-to-top
+  bool has_multicolors = display.epd2.panel == GxEPD2::ACeP565;
+  uint32_t startTime = millis();
+  if ((x >= display.width()) || (y >= display.height())) return;
+  display.fillScreen(GxEPD_WHITE);
+  Serial.print("connecting to "); Serial.println(host);
+  if (!client.connect(host, httpPort))
+  {
+    Serial.println("connection failed");
+    return;
+  }
+  Serial.print("requesting URL: ");
+  Serial.println(String("http://") + host + path + filename);
+  client.print(String("GET ") + path + filename + " HTTP/1.1\r\n" +
+               "Host: " + host + "\r\n" +
+               "User-Agent: GxEPD2_WiFi_Example\r\n" +
+               "Connection: close\r\n\r\n");
+  Serial.println("request sent");
+  while (client.connected())
+  {
+    String line = client.readStringUntil('\n');
+    if (!connection_ok)
+    {
+      connection_ok = line.startsWith("HTTP/1.1 200 OK");
+      if (connection_ok) Serial.println(line);
+      //if (!connection_ok) Serial.println(line);
+    }
+    if (!connection_ok) Serial.println(line);
+    //Serial.println(line);
+    if (line == "\r")
+    {
+      Serial.println("headers received");
+      break;
+    }
+  }
+  if (!connection_ok) return;
+  // Parse BMP header
+  if (read16(client) == 0x4D42) // BMP signature
+  {
+    uint32_t fileSize = read32(client);
+    uint32_t creatorBytes = read32(client); (void)creatorBytes; //unused
+    uint32_t imageOffset = read32(client); // Start of image data
+    uint32_t headerSize = read32(client);
+    uint32_t width  = read32(client);
+    int32_t height = (int32_t) read32(client);
+    uint16_t planes = read16(client);
+    uint16_t depth = read16(client); // bits per pixel
+    uint32_t format = read32(client);
+    uint32_t bytes_read = 7 * 4 + 3 * 2; // read so far
+    if ((planes == 1) && ((format == 0) || (format == 3))) // uncompressed is handled, 565 also
+    {
+      Serial.print("File size: "); Serial.println(fileSize);
+      Serial.print("Image Offset: "); Serial.println(imageOffset);
+      Serial.print("Header size: "); Serial.println(headerSize);
+      Serial.print("Bit Depth: "); Serial.println(depth);
+      Serial.print("Image size: ");
+      Serial.print(width);
+      Serial.print('x');
+      Serial.println(height);
+      // BMP rows are padded (if needed) to 4-byte boundary
+      uint32_t rowSize = (width * depth / 8 + 3) & ~3;
+      if (depth < 8) rowSize = ((width * depth + 8 - depth) / 8 + 3) & ~3;
+      if (height < 0)
+      {
+        height = -height;
+        flip = false;
+      }
+      uint16_t w = width;
+      uint16_t h = height;
+      if ((x + w - 1) >= display.width())  w = display.width()  - x;
+      if ((y + h - 1) >= display.height()) h = display.height() - y;
+      //if (w <= max_row_width) // handle with direct drawing
+      {
+        valid = true;
+        uint8_t bitmask = 0xFF;
+        uint8_t bitshift = 8 - depth;
+        uint16_t red, green, blue;
+        bool whitish = false;
+        bool colored = false;
+        if (depth == 1) with_color = false;
+        if (depth <= 8)
+        {
+          if (depth < 8) bitmask >>= depth;
+          //bytes_read += skip(client, 54 - bytes_read); //palette is always @ 54
+          bytes_read += skip(client, imageOffset - (4 << depth) - bytes_read); // 54 for regular, diff for colorsimportant
+          for (uint16_t pn = 0; pn < (1 << depth); pn++)
+          {
+            blue  = client.read();
+            green = client.read();
+            red   = client.read();
+            client.read();
+            bytes_read += 4;
+            whitish = with_color ? ((red > 0x80) && (green > 0x80) && (blue > 0x80)) : ((red + green + blue) > 3 * 0x80); // whitish
+            colored = (red > 0xF0) || ((green > 0xF0) && (blue > 0xF0)); // reddish or yellowish?
+            if (0 == pn % 8) mono_palette_buffer[pn / 8] = 0;
+            mono_palette_buffer[pn / 8] |= whitish << pn % 8;
+            if (0 == pn % 8) color_palette_buffer[pn / 8] = 0;
+            color_palette_buffer[pn / 8] |= colored << pn % 8;
+            //Serial.print("0x00"); Serial.print(red, HEX); Serial.print(green, HEX); Serial.print(blue, HEX);
+            //Serial.print(" : "); Serial.print(whitish); Serial.print(", "); Serial.println(colored);
+            rgb_palette_buffer[pn] = ((red & 0xF8) << 8) | ((green & 0xFC) << 3) | ((blue & 0xF8) >> 3);
+          }
+        }
+        uint32_t rowPosition = flip ? imageOffset + (height - h) * rowSize : imageOffset;
+        //Serial.print("skip "); Serial.println(rowPosition - bytes_read);
+        bytes_read += skip(client, rowPosition - bytes_read);
+        for (uint16_t row = 0; row < h; row++, rowPosition += rowSize) // for each line
+        {
+          if (!connection_ok || !(client.connected() || client.available())) break;
+          delay(1); // yield() to avoid WDT
+          uint32_t in_remain = rowSize;
+          uint32_t in_idx = 0;
+          uint32_t in_bytes = 0;
+          uint8_t in_byte = 0; // for depth <= 8
+          uint8_t in_bits = 0; // for depth <= 8
+          uint16_t color = GxEPD_WHITE;
+          for (uint16_t col = 0; col < w; col++) // for each pixel
+          {
+            yield();
+            if (!connection_ok || !(client.connected() || client.available())) break;
+            // Time to read more pixel data?
+            if (in_idx >= in_bytes) // ok, exact match for 24bit also (size IS multiple of 3)
+            {
+              uint32_t get = in_remain > sizeof(input_buffer) ? sizeof(input_buffer) : in_remain;
+              uint32_t got = read8n(client, input_buffer, get);
+              while ((got < get) && connection_ok)
+              {
+                //Serial.print("got "); Serial.print(got); Serial.print(" < "); Serial.print(get); Serial.print(" @ "); Serial.println(bytes_read);
+                uint32_t gotmore = read8n(client, input_buffer + got, get - got);
+                got += gotmore;
+                connection_ok = gotmore > 0;
+              }
+              in_bytes = got;
+              in_remain -= got;
+              bytes_read += got;
+            }
+            if (!connection_ok)
+            {
+              Serial.print("Error: got no more after "); Serial.print(bytes_read); Serial.println(" bytes read!");
+              break;
+            }
+            switch (depth)
+            {
+              case 24:
+                blue = input_buffer[in_idx++];
+                green = input_buffer[in_idx++];
+                red = input_buffer[in_idx++];
+                whitish = with_color ? ((red > 0x80) && (green > 0x80) && (blue > 0x80)) : ((red + green + blue) > 3 * 0x80); // whitish
+                colored = (red > 0xF0) || ((green > 0xF0) && (blue > 0xF0)); // reddish or yellowish?
+                color = ((red & 0xF8) << 8) | ((green & 0xFC) << 3) | ((blue & 0xF8) >> 3);
+                break;
+              case 16:
+                {
+                  uint8_t lsb = input_buffer[in_idx++];
+                  uint8_t msb = input_buffer[in_idx++];
+                  if (format == 0) // 555
+                  {
+                    blue  = (lsb & 0x1F) << 3;
+                    green = ((msb & 0x03) << 6) | ((lsb & 0xE0) >> 2);
+                    red   = (msb & 0x7C) << 1;
+                    color = ((red & 0xF8) << 8) | ((green & 0xFC) << 3) | ((blue & 0xF8) >> 3);
+                  }
+                  else // 565
+                  {
+                    blue  = (lsb & 0x1F) << 3;
+                    green = ((msb & 0x07) << 5) | ((lsb & 0xE0) >> 3);
+                    red   = (msb & 0xF8);
+                    color = (msb << 8) | lsb;
+                  }
+                  whitish = with_color ? ((red > 0x80) && (green > 0x80) && (blue > 0x80)) : ((red + green + blue) > 3 * 0x80); // whitish
+                  colored = (red > 0xF0) || ((green > 0xF0) && (blue > 0xF0)); // reddish or yellowish?
+                }
+                break;
+              case 1:
+              case 4:
+              case 8:
+                {
+                  if (0 == in_bits)
+                  {
+                    in_byte = input_buffer[in_idx++];
+                    in_bits = 8;
+                  }
+                  uint16_t pn = (in_byte >> bitshift) & bitmask;
+                  whitish = mono_palette_buffer[pn / 8] & (0x1 << pn % 8);
+                  colored = color_palette_buffer[pn / 8] & (0x1 << pn % 8);
+                  in_byte <<= depth;
+                  in_bits -= depth;
+                  color = rgb_palette_buffer[pn];
+                }
+                break;
+            }
+            if (with_color && has_multicolors)
+            {
+              // keep color
+            }
+            else if (whitish)
+            {
+              color = GxEPD_WHITE;
+            }
+            else if (colored && with_color)
+            {
+              color = GxEPD_COLORED;
+            }
+            else
+            {
+              color = GxEPD_BLACK;
+            }
+            uint16_t yrow = y + (flip ? h - row - 1 : row);
+            display.drawPixel(x + col, yrow, color);
+          } // end pixel
+        } // end line
+      }
+      Serial.print("bytes read "); Serial.println(bytes_read);
+    }
+  }
+  Serial.print("loaded in "); Serial.print(millis() - startTime); Serial.println(" ms");
+  client.stop();
+  if (!valid)
+  {
+    Serial.println("bitmap format not handled.");
+  }
+}
+
+void showBitmapFrom_HTTP_Buffered(const char* host, const char* path, const char* filename, int16_t x, int16_t y, bool with_color)
+{
+  Serial.println(); Serial.print("downloading file \""); Serial.print(filename);  Serial.println("\"");
+  display.setFullWindow();
+  display.firstPage();
+  do
+  {
+    drawBitmapFrom_HTTP_ToBuffer(host, path, filename, x, y, with_color);
+  }
+  while (display.nextPage());
+}
+
+void showBitmapFrom_HTTPS(const char* host, const char* path, const char* filename, const char* fingerprint, int16_t x, int16_t y, bool with_color, const char* certificate)
+{
+  // Use WiFiClientSecure class to create TLS connection
+#if defined (ESP8266)
+  BearSSL::WiFiClientSecure client;
+#else
+  WiFiClientSecure client;
+#endif
+  bool connection_ok = false;
+  bool valid = false; // valid format to be handled
+  bool flip = true; // bitmap is stored bottom-to-top
+  uint32_t startTime = millis();
+  if ((x >= display.epd2.WIDTH) || (y >= display.epd2.HEIGHT)) return;
+  Serial.println(); Serial.print("downloading file \""); Serial.print(filename);  Serial.println("\"");
+  Serial.print("connecting to "); Serial.println(host);
+#if defined (ESP8266)
+  client.setBufferSizes(4096, 4096); // required
+  client.setCertStore(&certStore);
+#elif defined (ESP32)
+  if (certificate) client.setCACert(certificate);
+#endif
+  if (!client.connect(host, httpsPort))
+  {
+    Serial.println("connection failed");
+    return;
+  }
+  Serial.print("requesting URL: ");
+  Serial.println(String("https://") + host + path + filename);
+  client.print(String("GET ") + path + filename + " HTTP/1.1\r\n" +
+               "Host: " + host + "\r\n" +
+               "User-Agent: GxEPD2_WiFi_Example\r\n" +
+               "Connection: close\r\n\r\n");
+  Serial.println("request sent");
+  while (client.connected())
+  {
+    String line = client.readStringUntil('\n');
+    if (!connection_ok)
+    {
+      connection_ok = line.startsWith("HTTP/1.1 200 OK");
+      if (connection_ok) Serial.println(line);
+      //if (!connection_ok) Serial.println(line);
+    }
+    if (!connection_ok) Serial.println(line);
+    //Serial.println(line);
+    if (line == "\r")
+    {
+      Serial.println("headers received");
+      break;
+    }
+  }
+  if (!connection_ok) return;
+  // Parse BMP header
+  //if (read16(client) == 0x4D42) // BMP signature
+  uint16_t signature = 0;
+  for (int16_t i = 0; i < 50; i++)
+  {
+    if (!client.available()) delay(100);
+    else signature = read16(client);
+    if (signature == 0x4D42) break;
+  }
+  if (signature == 0x4D42) // BMP signature
+  {
+    uint32_t fileSize = read32(client);
+    uint32_t creatorBytes = read32(client); (void)creatorBytes; //unused
+    uint32_t imageOffset = read32(client); // Start of image data
+    uint32_t headerSize = read32(client);
+    uint32_t width  = read32(client);
+    int32_t height = (int32_t) read32(client);
+    uint16_t planes = read16(client);
+    uint16_t depth = read16(client); // bits per pixel
+    uint32_t format = read32(client);
+    uint32_t bytes_read = 7 * 4 + 3 * 2; // read so far
+    //Serial.print("planes: "); Serial.println(planes);
+    //Serial.print("format: "); Serial.println(format);
+    if ((planes == 1) && ((format == 0) || (format == 3))) // uncompressed is handled, 565 also
+    {
+      Serial.print("File size: "); Serial.println(fileSize);
+      Serial.print("Image Offset: "); Serial.println(imageOffset);
+      Serial.print("Header size: "); Serial.println(headerSize);
+      Serial.print("Bit Depth: "); Serial.println(depth);
+      Serial.print("Image size: ");
+      Serial.print(width);
+      Serial.print('x');
+      Serial.println(height);
+      // BMP rows are padded (if needed) to 4-byte boundary
+      uint32_t rowSize = (width * depth / 8 + 3) & ~3;
+      if (depth < 8) rowSize = ((width * depth + 8 - depth) / 8 + 3) & ~3;
+      if (height < 0)
+      {
+        height = -height;
+        flip = false;
+      }
+      uint16_t w = width;
+      uint16_t h = height;
+      if ((x + w - 1) >= display.epd2.WIDTH)  w = display.epd2.WIDTH  - x;
+      if ((y + h - 1) >= display.epd2.HEIGHT) h = display.epd2.HEIGHT - y;
+      if (w <= max_row_width) // handle with direct drawing
+      {
+        valid = true;
+        uint8_t bitmask = 0xFF;
+        uint8_t bitshift = 8 - depth;
+        uint16_t red, green, blue;
+        bool whitish = false;
+        bool colored = false;
+        if (depth == 1) with_color = false;
+        if (depth <= 8)
+        {
+          if (depth < 8) bitmask >>= depth;
+          //bytes_read += skip(client, 54 - bytes_read); //palette is always @ 54
+          bytes_read += skip(client, imageOffset - (4 << depth) - bytes_read); // 54 for regular, diff for colorsimportant
+          for (uint16_t pn = 0; pn < (1 << depth); pn++)
+          {
+            blue  = client.read();
+            green = client.read();
+            red   = client.read();
+            client.read();
+            bytes_read += 4;
+            whitish = with_color ? ((red > 0x80) && (green > 0x80) && (blue > 0x80)) : ((red + green + blue) > 3 * 0x80); // whitish
+            colored = (red > 0xF0) || ((green > 0xF0) && (blue > 0xF0)); // reddish or yellowish?
+            if (0 == pn % 8) mono_palette_buffer[pn / 8] = 0;
+            mono_palette_buffer[pn / 8] |= whitish << pn % 8;
+            if (0 == pn % 8) color_palette_buffer[pn / 8] = 0;
+            color_palette_buffer[pn / 8] |= colored << pn % 8;
+          }
+        }
+        display.clearScreen();
+        uint32_t rowPosition = flip ? imageOffset + (height - h) * rowSize : imageOffset;
+        //Serial.print("skip "); Serial.println(rowPosition - bytes_read);
+        bytes_read += skip(client, rowPosition - bytes_read);
+        for (uint16_t row = 0; row < h; row++, rowPosition += rowSize) // for each line
+        {
+          if (!connection_ok || !(client.connected() || client.available())) break;
+          delay(1); // yield() to avoid WDT
+          uint32_t in_remain = rowSize;
+          uint32_t in_idx = 0;
+          uint32_t in_bytes = 0;
+          uint8_t in_byte = 0; // for depth <= 8
+          uint8_t in_bits = 0; // for depth <= 8
+          uint8_t out_byte = 0xFF; // white (for w%8!=0 border)
+          uint8_t out_color_byte = 0xFF; // white (for w%8!=0 border)
+          uint32_t out_idx = 0;
+          for (uint16_t col = 0; col < w; col++) // for each pixel
+          {
+            yield();
+            if (!connection_ok || !(client.connected() || client.available())) break;
+            // Time to read more pixel data?
+            if (in_idx >= in_bytes) // ok, exact match for 24bit also (size IS multiple of 3)
+            {
+              uint32_t get = in_remain > sizeof(input_buffer) ? sizeof(input_buffer) : in_remain;
+              uint32_t got = read8n(client, input_buffer, get);
+              while ((got < get) && connection_ok)
+              {
+                //Serial.print("got "); Serial.print(got); Serial.print(" < "); Serial.print(get); Serial.print(" @ "); Serial.println(bytes_read);
+                //if ((get - got) > client.available()) delay(200); // does improve? yes, if >= 200
+                uint32_t gotmore = read8n(client, input_buffer + got, get - got);
+                got += gotmore;
+                connection_ok = gotmore > 0;
+              }
+              in_bytes = got;
+              in_remain -= got;
+              bytes_read += got;
+            }
+            if (!connection_ok)
+            {
+              Serial.print("Error: got no more after "); Serial.print(bytes_read); Serial.println(" bytes read!");
+              break;
+            }
+            switch (depth)
+            {
+              case 24:
+                blue = input_buffer[in_idx++];
+                green = input_buffer[in_idx++];
+                red = input_buffer[in_idx++];
+                whitish = with_color ? ((red > 0x80) && (green > 0x80) && (blue > 0x80)) : ((red + green + blue) > 3 * 0x80); // whitish
+                colored = (red > 0xF0) || ((green > 0xF0) && (blue > 0xF0)); // reddish or yellowish?
+                break;
+              case 16:
+                {
+                  uint8_t lsb = input_buffer[in_idx++];
+                  uint8_t msb = input_buffer[in_idx++];
+                  if (format == 0) // 555
+                  {
+                    blue  = (lsb & 0x1F) << 3;
+                    green = ((msb & 0x03) << 6) | ((lsb & 0xE0) >> 2);
+                    red   = (msb & 0x7C) << 1;
+                  }
+                  else // 565
+                  {
+                    blue  = (lsb & 0x1F) << 3;
+                    green = ((msb & 0x07) << 5) | ((lsb & 0xE0) >> 3);
+                    red   = (msb & 0xF8);
+                  }
+                  whitish = with_color ? ((red > 0x80) && (green > 0x80) && (blue > 0x80)) : ((red + green + blue) > 3 * 0x80); // whitish
+                  colored = (red > 0xF0) || ((green > 0xF0) && (blue > 0xF0)); // reddish or yellowish?
+                }
+                break;
+              case 1:
+              case 4:
+              case 8:
+                {
+                  if (0 == in_bits)
+                  {
+                    in_byte = input_buffer[in_idx++];
+                    in_bits = 8;
+                  }
+                  uint16_t pn = (in_byte >> bitshift) & bitmask;
+                  whitish = mono_palette_buffer[pn / 8] & (0x1 << pn % 8);
+                  colored = color_palette_buffer[pn / 8] & (0x1 << pn % 8);
+                  in_byte <<= depth;
+                  in_bits -= depth;
+                }
+                break;
+            }
+            if (whitish)
+            {
+              // keep white
+            }
+            else if (colored && with_color)
+            {
+              out_color_byte &= ~(0x80 >> col % 8); // colored
+            }
+            else
+            {
+              out_byte &= ~(0x80 >> col % 8); // black
+            }
+            if ((7 == col % 8) || (col == w - 1)) // write that last byte! (for w%8!=0 border)
+            {
+              output_row_color_buffer[out_idx] = out_color_byte;
+              output_row_mono_buffer[out_idx++] = out_byte;
+              out_byte = 0xFF; // white (for w%8!=0 border)
+              out_color_byte = 0xFF; // white (for w%8!=0 border)
+            }
+          } // end pixel
+          int16_t yrow = y + (flip ? h - row - 1 : row);
+          display.writeImage(output_row_mono_buffer, output_row_color_buffer, x, yrow, w, 1);
+        } // end line
+        Serial.print("downloaded in "); Serial.print(millis() - startTime); Serial.println(" ms");
+        Serial.print("bytes read "); Serial.println(bytes_read);
+        display.refresh();
+      }
+    }
+  }
+  client.stop();
+  if (!valid)
+  {
+    Serial.println("bitmap format not handled.");
+  }
+}
+
+void drawBitmapFrom_HTTPS_ToBuffer(const char* host, const char* path, const char* filename, const char* fingerprint, int16_t x, int16_t y, bool with_color, const char* certificate)
+{
+  // Use WiFiClientSecure class to create TLS connection
+#if defined (ESP8266)
+  BearSSL::WiFiClientSecure client;
+#else
+  WiFiClientSecure client;
+#endif
+  bool connection_ok = false;
+  bool valid = false; // valid format to be handled
+  bool flip = true; // bitmap is stored bottom-to-top
+  bool has_multicolors = display.epd2.panel == GxEPD2::ACeP565;
+  uint32_t startTime = millis();
+  if ((x >= display.width()) || (y >= display.height())) return;
+  display.fillScreen(GxEPD_WHITE);
+  Serial.print("connecting to "); Serial.println(host);
+#if defined (ESP8266)
+  //client.setBufferSizes(4096, 4096); // required
+  client.setBufferSizes(8192, 4096); // may help
+  client.setCertStore(&certStore);
+#elif defined (ESP32)
+  if (certificate) client.setCACert(certificate);
+#endif
+  if (!client.connect(host, httpsPort))
+  {
+    Serial.println("connection failed");
+    return;
+  }
+  Serial.print("requesting URL: ");
+  Serial.println(String("https://") + host + path + filename);
+  client.print(String("GET ") + path + filename + " HTTP/1.1\r\n" +
+               "Host: " + host + "\r\n" +
+               "User-Agent: GxEPD2_WiFi_Example\r\n" +
+               "Connection: close\r\n\r\n");
+  Serial.println("request sent");
+  while (client.connected())
+  {
+    String line = client.readStringUntil('\n');
+    if (!connection_ok)
+    {
+      connection_ok = line.startsWith("HTTP/1.1 200 OK");
+      if (connection_ok) Serial.println(line);
+      //if (!connection_ok) Serial.println(line);
+    }
+    if (!connection_ok) Serial.println(line);
+    //Serial.println(line);
+    if (line == "\r")
+    {
+      Serial.println("headers received");
+      break;
+    }
+  }
+  if (!connection_ok) return;
+  // Parse BMP header
+  //if (read16(client) == 0x4D42) // BMP signature
+  uint16_t signature = 0;
+  for (int16_t i = 0; i < 50; i++)
+  {
+    if (!client.available()) delay(100);
+    else signature = read16(client);
+    //Serial.print("signature: 0x"); Serial.println(signature, HEX);
+    if (signature == 0x4D42)
+    {
+      //Serial.print("signature wait loops: "); Serial.println(i);
+      break;
+    }
+  }
+  if (signature == 0x4D42) // BMP signature
+  {
+    uint32_t fileSize = read32(client);
+    uint32_t creatorBytes = read32(client); (void)creatorBytes; //unused
+    uint32_t imageOffset = read32(client); // Start of image data
+    uint32_t headerSize = read32(client);
+    uint32_t width  = read32(client);
+    int32_t height = (int32_t) read32(client);
+    uint16_t planes = read16(client);
+    uint16_t depth = read16(client); // bits per pixel
+    uint32_t format = read32(client);
+    uint32_t bytes_read = 7 * 4 + 3 * 2; // read so far
+    if ((planes == 1) && ((format == 0) || (format == 3))) // uncompressed is handled, 565 also
+    {
+      Serial.print("File size: "); Serial.println(fileSize);
+      Serial.print("Image Offset: "); Serial.println(imageOffset);
+      Serial.print("Header size: "); Serial.println(headerSize);
+      Serial.print("Bit Depth: "); Serial.println(depth);
+      Serial.print("Image size: ");
+      Serial.print(width);
+      Serial.print('x');
+      Serial.println(height);
+      // BMP rows are padded (if needed) to 4-byte boundary
+      uint32_t rowSize = (width * depth / 8 + 3) & ~3;
+      if (depth < 8) rowSize = ((width * depth + 8 - depth) / 8 + 3) & ~3;
+      if (height < 0)
+      {
+        height = -height;
+        flip = false;
+      }
+      uint16_t w = width;
+      uint16_t h = height;
+      if ((x + w - 1) >= display.width())  w = display.width()  - x;
+      if ((y + h - 1) >= display.height()) h = display.height() - y;
+      //if (w <= max_row_width) // handle with direct drawing
+      {
+        valid = true;
+        uint8_t bitmask = 0xFF;
+        uint8_t bitshift = 8 - depth;
+        uint16_t red, green, blue;
+        bool whitish = false;
+        bool colored = false;
+        if (depth == 1) with_color = false;
+        if (depth <= 8)
+        {
+          if (depth < 8) bitmask >>= depth;
+          //bytes_read += skip(client, 54 - bytes_read); //palette is always @ 54
+          bytes_read += skip(client, imageOffset - (4 << depth) - bytes_read); // 54 for regular, diff for colorsimportant
+          for (uint16_t pn = 0; pn < (1 << depth); pn++)
+          {
+            blue  = client.read();
+            green = client.read();
+            red   = client.read();
+            client.read();
+            bytes_read += 4;
+            whitish = with_color ? ((red > 0x80) && (green > 0x80) && (blue > 0x80)) : ((red + green + blue) > 3 * 0x80); // whitish
+            colored = (red > 0xF0) || ((green > 0xF0) && (blue > 0xF0)); // reddish or yellowish?
+            if (0 == pn % 8) mono_palette_buffer[pn / 8] = 0;
+            mono_palette_buffer[pn / 8] |= whitish << pn % 8;
+            if (0 == pn % 8) color_palette_buffer[pn / 8] = 0;
+            color_palette_buffer[pn / 8] |= colored << pn % 8;
+            //Serial.print("0x00"); Serial.print(red, HEX); Serial.print(green, HEX); Serial.print(blue, HEX);
+            //Serial.print(" : "); Serial.print(whitish); Serial.print(", "); Serial.println(colored);
+            rgb_palette_buffer[pn] = ((red & 0xF8) << 8) | ((green & 0xFC) << 3) | ((blue & 0xF8) >> 3);
+          }
+        }
+        uint32_t rowPosition = flip ? imageOffset + (height - h) * rowSize : imageOffset;
+        //Serial.print("skip "); Serial.println(rowPosition - bytes_read);
+        bytes_read += skip(client, rowPosition - bytes_read);
+        for (uint16_t row = 0; row < h; row++, rowPosition += rowSize) // for each line
+        {
+          if (!connection_ok || !(client.connected() || client.available())) break;
+          delay(1); // yield() to avoid WDT
+          uint32_t in_remain = rowSize;
+          uint32_t in_idx = 0;
+          uint32_t in_bytes = 0;
+          uint8_t in_byte = 0; // for depth <= 8
+          uint8_t in_bits = 0; // for depth <= 8
+          uint16_t color = GxEPD_WHITE;
+          for (uint16_t col = 0; col < w; col++) // for each pixel
+          {
+            yield();
+            if (!connection_ok || !(client.connected() || client.available())) break;
+            // Time to read more pixel data?
+            if (in_idx >= in_bytes) // ok, exact match for 24bit also (size IS multiple of 3)
+            {
+              uint32_t get = in_remain > sizeof(input_buffer) ? sizeof(input_buffer) : in_remain;
+              uint32_t got = read8n(client, input_buffer, get);
+              while ((got < get) && connection_ok)
+              {
+                //Serial.print("got "); Serial.print(got); Serial.print(" < "); Serial.print(get); Serial.print(" @ "); Serial.println(bytes_read);
+                uint32_t gotmore = read8n(client, input_buffer + got, get - got);
+                got += gotmore;
+                connection_ok = gotmore > 0;
+              }
+              in_bytes = got;
+              in_remain -= got;
+              bytes_read += got;
+            }
+            if (!connection_ok)
+            {
+              Serial.print("Error: got no more after "); Serial.print(bytes_read); Serial.println(" bytes read!");
+              break;
+            }
+            switch (depth)
+            {
+              case 24:
+                blue = input_buffer[in_idx++];
+                green = input_buffer[in_idx++];
+                red = input_buffer[in_idx++];
+                whitish = with_color ? ((red > 0x80) && (green > 0x80) && (blue > 0x80)) : ((red + green + blue) > 3 * 0x80); // whitish
+                colored = (red > 0xF0) || ((green > 0xF0) && (blue > 0xF0)); // reddish or yellowish?
+                color = ((red & 0xF8) << 8) | ((green & 0xFC) << 3) | ((blue & 0xF8) >> 3);
+                break;
+              case 16:
+                {
+                  uint8_t lsb = input_buffer[in_idx++];
+                  uint8_t msb = input_buffer[in_idx++];
+                  if (format == 0) // 555
+                  {
+                    blue  = (lsb & 0x1F) << 3;
+                    green = ((msb & 0x03) << 6) | ((lsb & 0xE0) >> 2);
+                    red   = (msb & 0x7C) << 1;
+                    color = ((red & 0xF8) << 8) | ((green & 0xFC) << 3) | ((blue & 0xF8) >> 3);
+                  }
+                  else // 565
+                  {
+                    blue  = (lsb & 0x1F) << 3;
+                    green = ((msb & 0x07) << 5) | ((lsb & 0xE0) >> 3);
+                    red   = (msb & 0xF8);
+                    color = (msb << 8) | lsb;
+                  }
+                  whitish = with_color ? ((red > 0x80) && (green > 0x80) && (blue > 0x80)) : ((red + green + blue) > 3 * 0x80); // whitish
+                  colored = (red > 0xF0) || ((green > 0xF0) && (blue > 0xF0)); // reddish or yellowish?
+                }
+                break;
+              case 1:
+              case 4:
+              case 8:
+                {
+                  if (0 == in_bits)
+                  {
+                    in_byte = input_buffer[in_idx++];
+                    in_bits = 8;
+                  }
+                  uint16_t pn = (in_byte >> bitshift) & bitmask;
+                  whitish = mono_palette_buffer[pn / 8] & (0x1 << pn % 8);
+                  colored = color_palette_buffer[pn / 8] & (0x1 << pn % 8);
+                  in_byte <<= depth;
+                  in_bits -= depth;
+                  color = rgb_palette_buffer[pn];
+                }
+                break;
+            }
+            if (with_color && has_multicolors)
+            {
+              // keep color
+            }
+            else if (whitish)
+            {
+              color = GxEPD_WHITE;
+            }
+            else if (colored && with_color)
+            {
+              color = GxEPD_COLORED;
+            }
+            else
+            {
+              color = GxEPD_BLACK;
+            }
+            uint16_t yrow = y + (flip ? h - row - 1 : row);
+            display.drawPixel(x + col, yrow, color);
+          } // end pixel
+        } // end line
+      }
+      Serial.print("bytes read "); Serial.println(bytes_read);
+    }
+  }
+  Serial.print("loaded in "); Serial.print(millis() - startTime); Serial.println(" ms");
+  client.stop();
+  if (!valid)
+  {
+    Serial.println("bitmap format not handled.");
+  }
+}
+
+void showBitmapFrom_HTTPS_Buffered(const char* host, const char* path, const char* filename, const char* fingerprint, int16_t x, int16_t y, bool with_color, const char* certificate)
+{
+  Serial.println(); Serial.print("downloading file \""); Serial.print(filename);  Serial.println("\"");
+  display.setFullWindow();
+  display.firstPage();
+  do
+  {
+    drawBitmapFrom_HTTPS_ToBuffer(host, path, filename, fingerprint, x, y, with_color, certificate);
+  }
+  while (display.nextPage());
+}
+
+uint16_t read16(WiFiClient& client)
+{
+  // BMP data is stored little-endian, same as Arduino.
+  uint16_t result;
+  ((uint8_t *)&result)[0] = client.read(); // LSB
+  ((uint8_t *)&result)[1] = client.read(); // MSB
+  return result;
+}
+
+uint32_t read32(WiFiClient& client)
+{
+  // BMP data is stored little-endian, same as Arduino.
+  uint32_t result;
+  ((uint8_t *)&result)[0] = client.read(); // LSB
+  ((uint8_t *)&result)[1] = client.read();
+  ((uint8_t *)&result)[2] = client.read();
+  ((uint8_t *)&result)[3] = client.read(); // MSB
+  return result;
+}
+
+#if USE_BearSSL
+
+uint32_t skip(BearSSL::WiFiClientSecure& client, int32_t bytes)
+{
+  int32_t remain = bytes;
+  uint32_t start = millis();
+  while ((client.connected() || client.available()) && (remain > 0))
+  {
+    if (client.available())
+    {
+      client.read();
+      remain--;
+    }
+    else delay(1);
+    if (millis() - start > 2000) break; // don't hang forever
+  }
+  return bytes - remain;
+}
+
+uint32_t read8n(BearSSL::WiFiClientSecure& client, uint8_t* buffer, int32_t bytes)
+{
+  int32_t remain = bytes;
+  uint32_t start = millis();
+  while ((client.connected() || client.available()) && (remain > 0))
+  {
+    if (client.available())
+    {
+      int16_t v = client.read();
+      *buffer++ = uint8_t(v);
+      remain--;
+    }
+    else delay(1);
+    if (millis() - start > 2000) break; // don't hang forever
+  }
+  return bytes - remain;
+}
+
+#endif
+
+uint32_t skip(WiFiClient& client, int32_t bytes)
+{
+  int32_t remain = bytes;
+  uint32_t start = millis();
+  while ((client.connected() || client.available()) && (remain > 0))
+  {
+    if (client.available())
+    {
+      client.read();
+      remain--;
+    }
+    else delay(1);
+    if (millis() - start > 2000) break; // don't hang forever
+  }
+  return bytes - remain;
+}
+
+uint32_t read8n(WiFiClient& client, uint8_t* buffer, int32_t bytes)
+{
+  int32_t remain = bytes;
+  uint32_t start = millis();
+  while ((client.connected() || client.available()) && (remain > 0))
+  {
+    if (client.available())
+    {
+      int16_t v = client.read();
+      *buffer++ = uint8_t(v);
+      remain--;
+    }
+    else delay(1);
+    if (millis() - start > 2000) break; // don't hang forever
+  }
+  return bytes - remain;
+}
+
+// Set time via NTP, as required for x.509 validation
+void setClock()
+{
+  configTime(3 * 3600, 0, "pool.ntp.org", "time.nist.gov");
+
+  Serial.print("Waiting for NTP time sync: ");
+  time_t now = time(nullptr);
+  while (now < 8 * 3600 * 2)
+  {
+    delay(500);
+    Serial.print(".");
+    now = time(nullptr);
+  }
+  Serial.println("");
+  struct tm timeinfo;
+  gmtime_r(&now, &timeinfo);
+  Serial.print("Current time: ");
+  Serial.print(asctime(&timeinfo));
+}

examples/GxEPD2_WiFi_CertStore_Example/GxEPD2_github_raw_certs.h

@@ -0,0 +1,141 @@
+// http://cacerts.digicert.com/DigiCertTLSRSASHA2562020CA1-1.crt
+// CN: DigiCert TLS RSA SHA256 2020 CA1 => name: DigiCert_TLS_RSA_SHA256_2020_CA1
+// not valid before: 2021-04-14 00:00:00
+// not valid after:  2031-04-13 23:59:59
+const char cert_DigiCert_TLS_RSA_SHA256_2020_CA1 [] PROGMEM = R"CERT(
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
+  )CERT";
+
+// how to find the certificate was not easy. finally I found it using Mozilla Firefox.
+// opened one of the bitmaps, e.g. https://raw.githubusercontent.com/ZinggJM/GxEPD2/master/extras/bitmaps/logo200x200.bmp
+// clicked the lock symbol, Connection secure clicked >, show connection details, clicked More Information, clicked View Certificate, clicked Download PEM (chain),
+// selected Open with Notepad. Copied the middle certificate and edited to the following format:
+// the number of characters per line is of no importance, but the 3 \n are needed
+
+// https://raw.githubusercontent.com
+// issued by DigiCert Inc : DigiCert TLS RSA SHA256 2020 CA1
+// not valid before: Fri, 18 Mar 2022 00:00:00 GMT
+// not valid after:  Tue, 21 Mar 2023 23:59:59 GMT
+const char github_io_chain_pem_first [] PROGMEM = R"CERT(
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
+)CERT";
+const char github_io_chain_pem_second [] PROGMEM = R"CERT(
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
+)CERT";
+const char github_io_chain_pem_third [] PROGMEM = R"CERT(
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
+)CERT";

examples/GxEPD2_WiFi_CertStore_Example/GxEPD2_wiring_examples.h

@@ -0,0 +1,74 @@
+// Display Library example for SPI e-paper panels from Dalian Good Display and boards from Waveshare.
+// Requires HW SPI and Adafruit_GFX. Caution: the e-paper panels require 3.3V supply AND data lines!
+//
+// Display Library based on Demo Example from Good Display: http://www.e-paper-display.com/download_list/downloadcategoryid=34&isMode=false.html
+//
+// Author: Jean-Marc Zingg
+//
+// Version: see library.properties
+//
+// Library: https://github.com/ZinggJM/GxEPD2
+
+// Supporting Arduino Forum Topics:
+// Waveshare e-paper displays with SPI: http://forum.arduino.cc/index.php?topic=487007.0
+// Good Display ePaper for Arduino: https://forum.arduino.cc/index.php?topic=436411.0
+
+// mapping suggestion from Waveshare SPI e-Paper to Wemos D1 mini
+// BUSY -> D2, RST -> D4, DC -> D3, CS -> D8, CLK -> D5, DIN -> D7, GND -> GND, 3.3V -> 3.3V
+// NOTE: connect 3.3k pull-down from D8 to GND if your board or shield has level converters
+// NOTE for ESP8266: using SS (GPIO15) for CS may cause boot mode problems, use different pin in case, or 4k7 pull-down
+
+// mapping suggestion from Waveshare SPI e-Paper to generic ESP8266
+// BUSY -> GPIO4, RST -> GPIO2, DC -> GPIO0, CS -> GPIO15, CLK -> GPIO14, DIN -> GPIO13, GND -> GND, 3.3V -> 3.3V
+// NOTE: connect 3.3k pull-down from GPIO15 to GND if your board or shield has level converters
+// NOTE for ESP8266: using SS (GPIO15) for CS may cause boot mode problems, use different pin in case, or 3.3k pull-down
+
+// mapping of Waveshare e-Paper ESP8266 Driver Board, new version
+// BUSY -> GPIO5, RST -> GPIO2, DC -> GPIO4, CS -> GPIO15, CLK -> GPIO14, DIN -> GPIO13, GND -> GND, 3.3V -> 3.3V
+// NOTE for ESP8266: using SS (GPIO15) for CS may cause boot mode problems, add a 3.3k pull-down in case
+//      the e-Paper ESP8266 Driver Board should have no boot mode issue, as it doesn't use level converters
+
+// mapping of Waveshare e-Paper ESP8266 Driver Board, old version
+// BUSY -> GPIO16, RST -> GPIO5, DC -> GPIO4, CS -> GPIO15, CLK -> GPIO14, DIN -> GPIO13, GND -> GND, 3.3V -> 3.3V
+// NOTE for ESP8266: using SS (GPIO15) for CS may cause boot mode problems, add a 3.3k pull-down in case
+//      the e-Paper ESP8266 Driver Board should have no boot mode issue, as it doesn't use level converters
+
+// mapping suggestion for ESP32, e.g. LOLIN32, see .../variants/.../pins_arduino.h for your board
+// NOTE: there are variants with different pins for SPI ! CHECK SPI PINS OF YOUR BOARD
+// BUSY -> 4, RST -> 16, DC -> 17, CS -> SS(5), CLK -> SCK(18), DIN -> MOSI(23), GND -> GND, 3.3V -> 3.3V
+
+// mapping of Waveshare ESP32 Driver Board
+// BUSY -> 25, RST -> 26, DC -> 27, CS-> 15, CLK -> 13, DIN -> 14
+// NOTE: this board uses "unusual" SPI pins and requires re-mapping of HW SPI to these pins in SPIClass
+//       see example GxEPD2_WS_ESP32_Driver.ino, it shows how this can be done easily
+
+// mapping suggestion for ESP32, e.g. LOLIN32 D32 PRO
+// BUSY -> 15, RST -> 2, DC -> 0, CS -> 5, CLK -> SCK(18), DIN -> MOSI(23), GND -> GND, 3.3V -> 3.3V
+// note: use explicit value for CS, as SS is re-defined to TF_CS(4) in pins_arduino.h for Board: "LOLIN D32 PRO"
+
+// mapping suggestion for ESP32, e.g. TTGO T8 ESP32-WROVER
+// BUSY -> 4, RST -> 0, DC -> 2, CS -> SS(5), CLK -> SCK(18), DIN -> MOSI(23), GND -> GND, 3.3V -> 3.3V
+// for use with Board: "ESP32 Dev Module":
+
+// new mapping suggestion for STM32F1, e.g. STM32F103C8T6 "BluePill"
+// BUSY -> A1, RST -> A2, DC -> A3, CS-> A4, CLK -> A5, DIN -> A7
+
+// mapping suggestion for AVR, UNO, NANO etc.
+// BUSY -> 7, RST -> 9, DC -> 8, CS-> 10, CLK -> 13, DIN -> 11
+
+// mapping of Waveshare Universal e-Paper Raw Panel Driver Shield for Arduino / NUCLEO
+// BUSY -> 7, RST -> 8, DC -> 9, CS-> 10, CLK -> 13, DIN -> 11
+
+// mapping suggestion for Arduino MEGA
+// BUSY -> 7, RST -> 9, DC -> 8, CS-> 53, CLK -> 52, DIN -> 51
+
+// mapping suggestion for Arduino DUE
+// BUSY -> 7, RST -> 9, DC -> 8, CS-> 77, CLK -> 76, DIN -> 75
+// SPI pins are on 6 pin 2x3 SPI header
+
+// mapping suggestion for Arduino MKR1000 or MKRZERO
+// note: can't use SS on MKR1000: is defined as 24, should be 4
+// BUSY -> 5, RST -> 6, DC -> 7, CS-> 4, CLK -> 9, DIN -> 8
+
+// mapping suggestion for Arduino Nano RP2040 Connect
+// BUSY -> 7, RST -> 9, DC -> 8, CS-> 10, CLK -> 13, DIN -> 11