this introduces optimistic_yield() used for when standard library
methods are normally used in tight loops waiting for something to
happen, like available().
On Linux (presumably Mac too), the header of the library
could not be included, caps changed to match the filename.
The line 'architectures=ESP8266' in library.properties caused:
WARNING: library ESP8266httpUpdate claims to run on [ESP8266] architecture(s) and may be incompatible with your current board which runs on [esp8266] architecture(s).
Because eboot first erases the space required for the new sketch, and
if the new sketch is larger then the old one, with the old way, part of
the beginning of new sketch will be deleted. Therefore for now I opted
to keep the max update size either half the available space for
sketches or what's left from the first one, whichever is smaller.
To be able to create a simple post mechanism for updates, I needed to
have a way to write the new binary, without knowing it's final size, so
I added an option to the end() method. Example in the WebServer
examples.
Proper error handling in the uploading python script
Much faster OTA example sketch with better results
New Update class that simplifies updating the firmware from any source
Updated Esp.updateSketch() to use the new class
