zGxEPD2/examples/GxEPD2_WiFi_Example/GxEPD2_WiFi_Example.ino

// GxEPD2_WiFi_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
//
// 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

// 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 (see GxEPD2_boards_added.h for old 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 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

// 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

// 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>

#if defined (ESP8266)
#define MAX_DISPLAY_BUFFER_SIZE (81920ul-34000ul-34000ul) // ~34000 base use, WiFiClientSecure seems to need about 34k more to work
#define MAX_HEIGHT(EPD) (EPD::HEIGHT <= MAX_DISPLAY_BUFFER_SIZE / (EPD::WIDTH / 8) ? EPD::HEIGHT : MAX_DISPLAY_BUFFER_SIZE / (EPD::WIDTH / 8))
#define MAX_HEIGHT_3C(EPD) (EPD::HEIGHT <= (MAX_DISPLAY_BUFFER_SIZE / 2) / (EPD::WIDTH / 8) ? EPD::HEIGHT : (MAX_DISPLAY_BUFFER_SIZE / 2) / (EPD::WIDTH / 8))
#define MAX_HEIGHT_7C(EPD) (EPD::HEIGHT <= (MAX_DISPLAY_BUFFER_SIZE) / (EPD::WIDTH / 2) ? EPD::HEIGHT : (MAX_DISPLAY_BUFFER_SIZE) / (EPD::WIDTH / 2))
// select one and adapt to your mapping, can use full buffer size (full HEIGHT)
//GxEPD2_BW<GxEPD2_154, MAX_HEIGHT(GxEPD2_154)> display(GxEPD2_154(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4)); // GDEP015OC1 no longer available
//GxEPD2_BW<GxEPD2_154_D67, MAX_HEIGHT(GxEPD2_154_D67)> display(GxEPD2_154_D67(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4)); // GDEH0154D67
//GxEPD2_BW<GxEPD2_154_T8, MAX_HEIGHT(GxEPD2_154_T8)> display(GxEPD2_154_T8(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4)); // GDEW0154T8 152x152
//GxEPD2_BW<GxEPD2_154_M09, MAX_HEIGHT(GxEPD2_154_M09)> display(GxEPD2_154_M09(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4)); // GDEW0154M09 200x200
//GxEPD2_BW<GxEPD2_154_M10, MAX_HEIGHT(GxEPD2_154_M10)> display(GxEPD2_154_M10(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4)); // GDEW0154M10 152x152
//GxEPD2_BW<GxEPD2_213, MAX_HEIGHT(GxEPD2_213)> display(GxEPD2_213(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4)); // GDE0213B1, phased out
//GxEPD2_BW<GxEPD2_213_B72, MAX_HEIGHT(GxEPD2_213_B72)> display(GxEPD2_213_B72(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4)); // GDEH0213B72
//GxEPD2_BW<GxEPD2_213_B73, MAX_HEIGHT(GxEPD2_213_B73)> display(GxEPD2_213_B73(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4)); // GDEH0213B73
//GxEPD2_BW<GxEPD2_213_flex, MAX_HEIGHT(GxEPD2_213_flex)> display(GxEPD2_213_flex(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4)); // GDEW0213I5F
//GxEPD2_BW<GxEPD2_290, MAX_HEIGHT(GxEPD2_290)> display(GxEPD2_290(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4));
//GxEPD2_BW<GxEPD2_290_T5, MAX_HEIGHT(GxEPD2_290_T5)> display(GxEPD2_290_T5(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4)); // GDEW029T5
//GxEPD2_BW<GxEPD2_260, MAX_HEIGHT(GxEPD2_260)> display(GxEPD2_260(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4));
//GxEPD2_BW<GxEPD2_270, MAX_HEIGHT(GxEPD2_270)> display(GxEPD2_270(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4));
//GxEPD2_BW<GxEPD2_371, MAX_HEIGHT(GxEPD2_371)> display(GxEPD2_371(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4));
//GxEPD2_BW<GxEPD2_420, MAX_HEIGHT(GxEPD2_420)> display(GxEPD2_420(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4));
//GxEPD2_BW<GxEPD2_583, MAX_HEIGHT(GxEPD2_583)> display(GxEPD2_583(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4));
//GxEPD2_BW<GxEPD2_583_T8, MAX_HEIGHT(GxEPD2_583_T8)> display(GxEPD2_583_T8(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4));
//GxEPD2_BW<GxEPD2_750, MAX_HEIGHT(GxEPD2_750)> display(GxEPD2_750(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4));
//GxEPD2_BW<GxEPD2_750_T7, MAX_HEIGHT(GxEPD2_750_T7)> display(GxEPD2_750_T7(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4)); // GDEW075T7 800x480
// 3-color e-papers
//GxEPD2_3C<GxEPD2_154c, MAX_HEIGHT_3C(GxEPD2_154c)> display(GxEPD2_154c(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4)); // GDEW0154Z04 no longer available
//GxEPD2_3C<GxEPD2_154_Z90c, MAX_HEIGHT_3C(GxEPD2_154_Z90c)> display(GxEPD2_154_Z90c(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4)); // GDEH0154Z90
//GxEPD2_3C<GxEPD2_213c, MAX_HEIGHT_3C(GxEPD2_213c)> display(GxEPD2_213c(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4));
//GxEPD2_3C<GxEPD2_290c, MAX_HEIGHT_3C(GxEPD2_290c)> display(GxEPD2_290c(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4));
//GxEPD2_3C<GxEPD2_270c, MAX_HEIGHT_3C(GxEPD2_270c)> display(GxEPD2_270c(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4));
//GxEPD2_3C<GxEPD2_420c, MAX_HEIGHT_3C(GxEPD2_420c)> display(GxEPD2_420c(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4));
//GxEPD2_3C<GxEPD2_583c, MAX_HEIGHT_3C(GxEPD2_583c)> display(GxEPD2_583c(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4));
//GxEPD2_3C<GxEPD2_750c, MAX_HEIGHT_3C(GxEPD2_750c)> display(GxEPD2_750c(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4));
//GxEPD2_3C<GxEPD2_750c_Z08, MAX_HEIGHT_3C(GxEPD2_750c_Z08)> display(GxEPD2_750c_Z08(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4)); // GDEW075Z08 800x480
//GxEPD2_3C<GxEPD2_750c_Z90, MAX_HEIGHT_3C(GxEPD2_750c_Z90)> display(GxEPD2_750c_Z90(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4)); // GDEH075Z90 880x528
// 7-color e-paper
//GxEPD2_3C<GxEPD2_565c, MAX_HEIGHT_7C(GxEPD2_565c)> display(GxEPD2_565c(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4)); // Waveshare 5.65" 7-color (3C graphics)
//GxEPD2_7C<GxEPD2_565c, MAX_HEIGHT_7C(GxEPD2_565c)> display(GxEPD2_565c(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4)); // Waveshare 5.65" 7-color
// grey levels parallel IF e-papers on Waveshare e-Paper IT8951 Driver HAT
// HRDY -> 4, RST -> 2, CS -> SS(15), SCK -> SCK(14), MOSI -> MOSI(D7(13)), MISO -> MISO(D6(12)), GND -> GND, 5V -> 5V
// note: 5V supply needs to be exact and strong; 5V pin of USB powered Wemos D1 mini doesn't work!
//GxEPD2_BW<GxEPD2_it60, MAX_HEIGHT(GxEPD2_it60)> display(GxEPD2_it60(/*CS=5*/ SS, /*DC=*/ 0, /*RST=*/ 2, /*BUSY=*/ 4));
//GxEPD2_BW<GxEPD2_it60_1448x1072, MAX_HEIGHT(GxEPD2_it60_1448x1072)> display(GxEPD2_it60_1448x1072(/*CS=5*/ SS, /*DC=*/ 0, /*RST=*/ 2, /*BUSY=*/ 4));

// ***** for mapping of Waveshare e-Paper ESP8266 Driver Board *****
// select one , can use full buffer size (full HEIGHT)
//GxEPD2_BW<GxEPD2_154, MAX_HEIGHT(GxEPD2_154)> display(GxEPD2_154(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=2*/ 2, /*BUSY=5*/ 5)); // GDEP015OC1 no longer available
//GxEPD2_BW<GxEPD2_154_D67, MAX_HEIGHT(GxEPD2_154_D67)> display(GxEPD2_154_D67(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=2*/ 2, /*BUSY=5*/ 5)); // GDEH0154D67
//GxEPD2_BW<GxEPD2_154_T8, MAX_HEIGHT(GxEPD2_154_T8)> display(GxEPD2_154_T8(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=2*/ 2, /*BUSY=5*/ 5)); // GDEW0154T8 152x152
//GxEPD2_BW<GxEPD2_154_M09, MAX_HEIGHT(GxEPD2_154_M09)> display(GxEPD2_154_M09(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=2*/ 2, /*BUSY=5*/ 5)); // GDEW0154M09 200x200
//GxEPD2_BW<GxEPD2_154_M10, MAX_HEIGHT(GxEPD2_154_M10)> display(GxEPD2_154_M10(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=2*/ 2, /*BUSY=5*/ 5)); // GDEW0154M10 152x152
//GxEPD2_BW<GxEPD2_213, MAX_HEIGHT(GxEPD2_213)> display(GxEPD2_213(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=2*/ 2, /*BUSY=5*/ 5)); // GDE0213B1, phased out
//GxEPD2_BW<GxEPD2_213_B72, MAX_HEIGHT(GxEPD2_213_B72)> display(GxEPD2_213_B72(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=2*/ 2, /*BUSY=5*/ 5)); // GDEH0213B72
//GxEPD2_BW<GxEPD2_213_B73, MAX_HEIGHT(GxEPD2_213_B73)> display(GxEPD2_213_B73(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=2*/ 2, /*BUSY=5*/ 5)); // GDEH0213B73
//GxEPD2_BW<GxEPD2_213_flex, MAX_HEIGHT(GxEPD2_213_flex)> display(GxEPD2_213_flex(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=2*/ 2, /*BUSY=5*/ 5)); // GDEW0213I5F
//GxEPD2_BW<GxEPD2_290, MAX_HEIGHT(GxEPD2_290)> display(GxEPD2_290(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=2*/ 2, /*BUSY=5*/ 5));
//GxEPD2_BW<GxEPD2_290_T5, MAX_HEIGHT(GxEPD2_290_T5)> display(GxEPD2_290_T5(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=2*/ 2, /*BUSY=5*/ 5)); // GDEW029T5
//GxEPD2_BW<GxEPD2_260, MAX_HEIGHT(GxEPD2_260)> display(GxEPD2_260(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=2*/ 2, /*BUSY=5*/ 5));
//GxEPD2_BW<GxEPD2_270, MAX_HEIGHT(GxEPD2_270)> display(GxEPD2_270(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=2*/ 2, /*BUSY=5*/ 5));
//GxEPD2_BW<GxEPD2_371, MAX_HEIGHT(GxEPD2_371)> display(GxEPD2_371(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=2*/ 2, /*BUSY=5*/ 5));
//GxEPD2_BW<GxEPD2_420, MAX_HEIGHT(GxEPD2_420)> display(GxEPD2_420(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=2*/ 2, /*BUSY=5*/ 5));
//GxEPD2_BW<GxEPD2_583, MAX_HEIGHT(GxEPD2_583)> display(GxEPD2_583(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=2*/ 2, /*BUSY=5*/ 5));
//GxEPD2_BW<GxEPD2_583_T8, MAX_HEIGHT(GxEPD2_583_T8)> display(GxEPD2_583_T8(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=2*/ 2, /*BUSY=5*/ 5));
//GxEPD2_BW<GxEPD2_750, MAX_HEIGHT(GxEPD2_750)> display(GxEPD2_750(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=2*/ 2, /*BUSY=5*/ 5));
//GxEPD2_BW<GxEPD2_750_T7, MAX_HEIGHT(GxEPD2_750_T7)> display(GxEPD2_750_T7(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=2*/ 2, /*BUSY=5*/ 5)); // GDEW075T7 800x480
// 3-color e-papers
//GxEPD2_3C<GxEPD2_154c, MAX_HEIGHT_3C(GxEPD2_154c)> display(GxEPD2_154c(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=2*/ 2, /*BUSY=5*/ 5)); // GDEW0154Z04 no longer available
//GxEPD2_3C<GxEPD2_154_Z90c, MAX_HEIGHT_3C(GxEPD2_154_Z90c)> display(GxEPD2_154_Z90c(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=2*/ 2, /*BUSY=5*/ 5)); // GDEH0154Z90
//GxEPD2_3C<GxEPD2_213c, MAX_HEIGHT_3C(GxEPD2_213c)> display(GxEPD2_213c(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=2*/ 2, /*BUSY=5*/ 5));
//GxEPD2_3C<GxEPD2_290c, MAX_HEIGHT_3C(GxEPD2_290c)> display(GxEPD2_290c(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=2*/ 2, /*BUSY=5*/ 5));
//GxEPD2_3C<GxEPD2_270c, MAX_HEIGHT_3C(GxEPD2_270c)> display(GxEPD2_270c(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=2*/ 2, /*BUSY=5*/ 5));
//GxEPD2_3C<GxEPD2_420c, MAX_HEIGHT_3C(GxEPD2_420c)> display(GxEPD2_420c(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=2*/ 2, /*BUSY=5*/ 5));
//GxEPD2_3C<GxEPD2_583c, MAX_HEIGHT_3C(GxEPD2_583c)> display(GxEPD2_583c(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=2*/ 2, /*BUSY=5*/ 5));
//GxEPD2_3C<GxEPD2_750c, MAX_HEIGHT_3C(GxEPD2_750c)> display(GxEPD2_750c(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=2*/ 2, /*BUSY=5*/ 5));
//GxEPD2_3C<GxEPD2_750c_Z08, MAX_HEIGHT_3C(GxEPD2_750c_Z08)> display(GxEPD2_750c_Z08(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=2*/ 2, /*BUSY=5*/ 5)); // GDEW075Z08 800x480
//GxEPD2_3C<GxEPD2_750c_Z90, MAX_HEIGHT_3C(GxEPD2_750c_Z90)> display(GxEPD2_750c_Z90(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=2*/ 2, /*BUSY=5*/ 5)); // GDEH075Z90 880x528
// 7-color e-paper
//GxEPD2_7C<GxEPD2_565c, MAX_HEIGHT_7C(GxEPD2_565c)> display(GxEPD2_565c(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=2*/ 2, /*BUSY=5*/ 5)); // Waveshare 5.65" 7-color
#endif

#if defined(ESP32)
// select one and adapt to your mapping, can use full buffer size (full HEIGHT)
//GxEPD2_BW<GxEPD2_154, GxEPD2_154::HEIGHT> display(GxEPD2_154(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4)); // GDEP015OC1 no longer available
//GxEPD2_BW<GxEPD2_154_D67, GxEPD2_154_D67::HEIGHT> display(GxEPD2_154_D67(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4)); // GDEH0154D67
//GxEPD2_BW<GxEPD2_154_T8, GxEPD2_154_T8::HEIGHT> display(GxEPD2_154_T8(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4)); // GDEW0154T8 152x152
//GxEPD2_BW<GxEPD2_154_M09, GxEPD2_154_M09::HEIGHT> display(GxEPD2_154_M09(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4)); // GDEW0154M09 200x200
//GxEPD2_BW<GxEPD2_154_M10, GxEPD2_154_M10::HEIGHT> display(GxEPD2_154_M10(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4)); // GDEW0154M10 152x152
//GxEPD2_BW<GxEPD2_213, GxEPD2_213::HEIGHT> display(GxEPD2_213(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4)); // GDE0213B1, phased out
//GxEPD2_BW<GxEPD2_213_B72, GxEPD2_213_B72::HEIGHT> display(GxEPD2_213_B72(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4)); // GDEH0213B72
//GxEPD2_BW<GxEPD2_213_B73, GxEPD2_213_B73::HEIGHT> display(GxEPD2_213_B73(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4)); // GDEH0213B73
//GxEPD2_BW<GxEPD2_213_flex, GxEPD2_213_flex::HEIGHT> display(GxEPD2_213_flex(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4)); // GDEW0213I5F
//GxEPD2_BW<GxEPD2_290, GxEPD2_290::HEIGHT> display(GxEPD2_290(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4));
//GxEPD2_BW<GxEPD2_290_T5, GxEPD2_290_T5::HEIGHT> display(GxEPD2_290_T5(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4)); // GDEW029T5
//GxEPD2_BW<GxEPD2_260, GxEPD2_260::HEIGHT> display(GxEPD2_260(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4));
//GxEPD2_BW<GxEPD2_270, GxEPD2_270::HEIGHT> display(GxEPD2_270(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4));
//GxEPD2_BW<GxEPD2_371, GxEPD2_371::HEIGHT> display(GxEPD2_371(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4));
//GxEPD2_BW<GxEPD2_420, GxEPD2_420::HEIGHT> display(GxEPD2_420(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4));
//GxEPD2_BW<GxEPD2_583, GxEPD2_583::HEIGHT> display(GxEPD2_583(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4));
//GxEPD2_BW<GxEPD2_583_T8, GxEPD2_583_T8::HEIGHT> display(GxEPD2_583_T8(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4));
//GxEPD2_BW<GxEPD2_750, GxEPD2_750::HEIGHT> display(GxEPD2_750(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4));
//GxEPD2_BW<GxEPD2_750_T7, GxEPD2_750_T7::HEIGHT> display(GxEPD2_750_T7(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4)); // GDEW075T7 800x480
// 3-color e-papers
//GxEPD2_3C<GxEPD2_154c, GxEPD2_154c::HEIGHT> display(GxEPD2_154c(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4)); // GDEW0154Z04 no longer available
//GxEPD2_3C<GxEPD2_154_Z90c, GxEPD2_154_Z90c::HEIGHT> display(GxEPD2_154_Z90c(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4)); // GDEH0154Z90
//GxEPD2_3C<GxEPD2_213c, GxEPD2_213c::HEIGHT> display(GxEPD2_213c(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4));
//GxEPD2_3C<GxEPD2_290c, GxEPD2_290c::HEIGHT> display(GxEPD2_290c(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4));
//GxEPD2_3C<GxEPD2_270c, GxEPD2_270c::HEIGHT> display(GxEPD2_270c(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4));
//GxEPD2_3C<GxEPD2_420c, GxEPD2_420c::HEIGHT> display(GxEPD2_420c(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4));
//GxEPD2_3C<GxEPD2_583c, GxEPD2_583c::HEIGHT> display(GxEPD2_583c(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4));
//GxEPD2_3C<GxEPD2_750c, GxEPD2_750c::HEIGHT> display(GxEPD2_750c(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4));
//GxEPD2_3C<GxEPD2_750c_Z08, GxEPD2_750c_Z08::HEIGHT> display(GxEPD2_750c_Z08(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4)); // GDEW075Z08 800x480
//GxEPD2_3C<GxEPD2_750c_Z90, GxEPD2_750c_Z90::HEIGHT / 2> display(GxEPD2_750c_Z90(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4)); // GDEH075Z90 880x528
// 7-color e-paper
//GxEPD2_3C < GxEPD2_565c, GxEPD2_565c::HEIGHT / 2 > display(GxEPD2_565c(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4)); // Waveshare 5.65" 7-color (3C graphics)
//GxEPD2_7C < GxEPD2_565c, GxEPD2_565c::HEIGHT / 2 > display(GxEPD2_565c(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4)); // Waveshare 5.65" 7-color
// grey levels parallel IF e-papers on Waveshare e-Paper IT8951 Driver HAT
// HRDY -> 4, RST -> 16, CS -> SS(5), SCK -> SCK(18), MOSI -> MOSI(23), MISO -> MISO(19), GND -> GND, 5V -> 5V
// note: 5V supply needs to be exact and strong; 5V over diode from USB (e.g. Wemos D1 mini) doesn't work!
//GxEPD2_BW<GxEPD2_it60, GxEPD2_it60::HEIGHT> display(GxEPD2_it60(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4));
//GxEPD2_BW < GxEPD2_it60_1448x1072, GxEPD2_it60_1448x1072::HEIGHT / 4 > display(GxEPD2_it60_1448x1072(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4));
// Waveshare 12.48 b/w SPI display board and frame or Good Display 12.48 b/w panel GDEW1248T3
// general constructor for use with all parameters, e.g. for Waveshare ESP32 driver board mounted on connection board
//GxEPD2_BW < GxEPD2_1248, GxEPD2_1248::HEIGHT / 4 >
//display(GxEPD2_1248(/*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

#if defined (ESP8266)
#include <ESP8266WiFi.h>
#define USE_BearSSL true
#endif

#include <WiFiClient.h>
#include <WiFiClientSecure.h>

const char* ssid     = "........";
const char* password = "........";
const int httpPort  = 80;
const int httpsPort = 443;
const char* fp_api_github_com = "df b2 29 c6 a6 38 1a 59 9d c9 ad 92 2d 26 f5 3c 83 8f a5 87"; // as of 25.11.2020
const char* fp_github_com     = "5f 3f 7a c2 56 9f 50 a4 66 76 47 c6 a1 8c a0 07 aa ed bb 8e"; // as of 25.11.2020
const char* fp_rawcontent     = "70 94 de dd e6 c4 69 48 3a 92 70 a1 48 56 78 2d 18 64 e0 b7"; // as of 25.11.2020

// 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 editted to the following format:
// the number of characters per line is of no importance, but the 3 \n are needed
const char* certificate_rawcontent =
  "-----BEGIN CERTIFICATE-----\n"
  "MIIEsTCCA5mgAwIBAgIQBOHnpNxc8vNtwCtCuF0VnzANBgkqhkiG9w0BAQsFADBsMQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGln"
  "aUNlcnQgSW5jMRkwFwYDVQQLExB3d3cuZGlnaWNlcnQuY29tMSswKQYDVQQDEyJEaWdpQ2VydCBIaWdoIEFzc3VyYW5jZSBFViBS"
  "b290IENBMB4XDTEzMTAyMjEyMDAwMFoXDTI4MTAyMjEyMDAwMFowcDELMAkGA1UEBhMCVVMxFTATBgNVBAoTDERpZ2lDZXJ0IElu"
  "YzEZMBcGA1UECxMQd3d3LmRpZ2ljZXJ0LmNvbTEvMC0GA1UEAxMmRGlnaUNlcnQgU0hBMiBIaWdoIEFzc3VyYW5jZSBTZXJ2ZXIg"
  "Q0EwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQC24C/CJAbIbQRf1+8KZAayfSImZRauQkCbztyfn3YHPsMwVYcZuU+U"
  "DlqUH1VWtMICKq/QmO4LQNfE0DtyyBSe75CxEamu0si4QzrZCwvV1ZX1QK/IHe1NnF9Xt4ZQaJn1itrSxwUfqJfJ3KSxgoQtxq2l"
  "nMcZgqaFD15EWCo3j/018QsIJzJa9buLnqS9UdAn4t07QjOjBSjEuyjMmqwrIw14xnvmXnG3Sj4I+4G3FhahnSMSTeXXkgisdaSc"
  "us0Xsh5ENWV/UyU50RwKmmMbGZJ0aAo3wsJSSMs5WqK24V3B3aAguCGikyZvFEohQcftbZvySC/zA/WiaJJTL17jAgMBAAGjggFJ"
  "MIIBRTASBgNVHRMBAf8ECDAGAQH/AgEAMA4GA1UdDwEB/wQEAwIBhjAdBgNVHSUEFjAUBggrBgEFBQcDAQYIKwYBBQUHAwIwNAYI"
  "KwYBBQUHAQEEKDAmMCQGCCsGAQUFBzABhhhodHRwOi8vb2NzcC5kaWdpY2VydC5jb20wSwYDVR0fBEQwQjBAoD6gPIY6aHR0cDov"
  "L2NybDQuZGlnaWNlcnQuY29tL0RpZ2lDZXJ0SGlnaEFzc3VyYW5jZUVWUm9vdENBLmNybDA9BgNVHSAENjA0MDIGBFUdIAAwKjAo"
  "BggrBgEFBQcCARYcaHR0cHM6Ly93d3cuZGlnaWNlcnQuY29tL0NQUzAdBgNVHQ4EFgQUUWj/kK8CB3U8zNllZGKiErhZcjswHwYD"
  "VR0jBBgwFoAUsT7DaQP4v0cB1JgmGggC72NkK8MwDQYJKoZIhvcNAQELBQADggEBABiKlYkD5m3fXPwdaOpKj4PWUS+Na0QWnqxj"
  "9dJubISZi6qBcYRb7TROsLd5kinMLYBq8I4g4Xmk/gNHE+r1hspZcX30BJZr01lYPf7TMSVcGDiEo+afgv2MW5gxTs14nhr9hctJ"
  "qvIni5ly/D6q1UEL2tU2ob8cbkdJf17ZSHwD2f2LSaCYJkJA69aSEaRkCldUxPUd1gJea6zuxICaEnL6VpPX/78whQYwvwt/Tv9X"
  "BZ0k7YXDK/umdaisLRbvfXknsuvCnQsH6qqF0wGjIChBWUMo0oHjqvbsezt3tkBigAVBRQHvFwY+3sAzm2fTYS5yh+Rp/BIAV0AecPUeybQ=\n"
  "-----END CERTIFICATE-----\n";


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%26JetsonNano/c/pic/";
const char* path_waveshare_py = "/waveshare/e-Paper/master/RaspberryPi%26JetsonNano/python/pic/";

// 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 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());

  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.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()
{
  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()
{
  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 = 1448; // for up to 6" display 1448x1072
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);
    uint32_t imageOffset = read32(client); // Start of image data
    uint32_t headerSize = read32(client);
    uint32_t width  = read32(client);
    uint32_t height = 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, colored;
        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);
    uint32_t imageOffset = read32(client); // Start of image data
    uint32_t headerSize = read32(client);
    uint32_t width  = read32(client);
    uint32_t height = 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, colored;
        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 USE_BearSSL
  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); // doesn't help
  if (fingerprint) client.setFingerprint(fingerprint);
#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
  {
    uint32_t fileSize = read32(client);
    uint32_t creatorBytes = read32(client);
    uint32_t imageOffset = read32(client); // Start of image data
    uint32_t headerSize = read32(client);
    uint32_t width  = read32(client);
    uint32_t height = 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, colored;
        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 USE_BearSSL
  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); // doesn't help
  if (fingerprint) client.setFingerprint(fingerprint);
#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
  {
    uint32_t fileSize = read32(client);
    uint32_t creatorBytes = read32(client);
    uint32_t imageOffset = read32(client); // Start of image data
    uint32_t headerSize = read32(client);
    uint32_t width  = read32(client);
    uint32_t height = 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, colored;
        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())
    {
      int16_t v = 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())
    {
      int16_t v = 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;
}