Lib does not work with wired connection

[Gerry33]

The lib is fairly good, but does not work for wired connection. Checked with a OLIMEX POE ESP32 controller.
The UDP reponse is not received at all.

Applying WIFI on the same board and all is fine.

[mountainman13]

I had the same issue, solved it by making a few changes to ESPNTPClient.cpp (as in release 0.2.7):
1 - Replace WiFi.isConnected() by ETH.localIP(), lines 190, 533 and 544.
2 - Replace WiFi.localIP() by ETH.localIP(), line 193.