Last piece to connect client to provider: actually downloading the image and displaying it

components/epd/epd.cpp

@@ -435,8 +435,7 @@ void epd_draw_bitmap_grayscale(epd_color clearColor, const uint8 *bitmap)
         }
       }
 
-      // The demo code applies a bitwise NOT to the result
-      g_scratch_buffer[scratch_idx++] = ~output_byte;
+      g_scratch_buffer[scratch_idx++] = output_byte;
 
       if (scratch_idx >= sizeof(g_scratch_buffer))
       {

components/epd/epd.hpp

@@ -22,6 +22,8 @@
 enum class epd_color : uint8
 {
   BLACK = 0x00,
+  DARK_GRAY = 0x55,
+  LIGHT_GRAY = 0xAA,
   WHITE = 0xFF
 };