Example repo

[nopnop2002]

Thank you for great work.

I made an example repo.

https://github.com/nopnop2002/esp8266_ethernet

If you read this, please close it.

Thank you again.

[d-a-v]

You should really try this pull request esp8266/Arduino#6680 which has a better integration and is an improvement of the driver you are using. If there is an issue with UDP, fix will be done in the pull request.

[d-a-v]

There is an easier way to try the ethernet PR:
You can change the URL in your board manager to point to the one described there:
Alpha, Beta and Gamma versions.
6680 is included in the version "gamma" 0.0.3. You need to "update" your version 2.7.0 or 2.7.1 to version 0.0.3 (which is version 2.7.1+ = 2.7.2beta plus the listed pull-requests). The ethernet driver will be included.
If there is a confirmed issue with UDP, then I'll have a look.

[nopnop2002]

There is an easier way to try the ethernet PR:

Thank you.

Regarding the NTP client, I found that configTzTime () works correctly using Core:2.7.1=20701000.

https://github.com/nopnop2002/esp8266_ethernet/blob/master/configTzTime/configTzTime.ino