Inconsistencies between Ethernet libraries of different architectures

[soosp]

I'm working on a multi architecture project and foundthat there are inconsistencies of Ethernet libraries for different architectures. E.g.:

1. Ethernet library for AVR contains Dns.h (with more DNS related functions) while Ehternet for Opta doesn't
2. Ehternet for AVR doesn't contain hostname related functions (e.g.: Ethternet.setHostName())

It'd be good to synchronize different Arduino architectures at API level, to make it possible to create portable code.

[soosp]

It was posted to https://github.com/arduino-libraries/Ethernet/issues/251 also.

[JAndrassy]

Ethernet in Mbed doesn't have setHostname, because Mbed networking doesn't support it

[soosp]

Sorry, It's my mistake, I has saw it in PlatformIO's framework-arduino-mbed code.

[JAndrassy]

I saw it in PlatformIO's framework-arduino-mbed code.

the previous version of Mbed Core had in the header but without an implementation in cpp