Udp.h included in ArduinoCore-samd and in ArduinoCore-API

[PatrickDekker98]

Reference from ArduinoCore-API repo: arduino/ArduinoCore-API#171

Udp.h is included in Core-samd and core-api, while one of them uses #pragma once and the other include guards. This causes problems when including both of them.

error: redefinition of 'class arduino::UDP'

[matthijskooijman]

As indicated in the other issue, I think that Udp.h should probably just be removed from this repo.

@PatrickDekker98 Did you happen to have checked the contents of these files? Any functional differences (i.e. other than comments and spacing)?

[PatrickDekker98]

Both classes are pure virtual and practically do the same thing: nothing
But, both classes have the same contents too

[PatrickDekker98]

@matthijskooijman do you know why the arduinoCore-api is not a git submodule in this project?
To me development of arduinoCore-samd seems cumbersome, having to first download api, then samd, then creating a symlink from api to samd

[matthijskooijman]

See arduino/ArduinoCore-API#96 for some consideration about using sumbodules.