I generated a build on 08-08-2019 and see that Ethernet does not show up
under "Network & internet", preventing assigning a static IP to the
adapter (NUC6CAYH). It does show connected and has an (DHCP) IP in
ADB. Is there any guidance on how this could be corrected?
Stock AOSP doesn't provide UI to configure IP address for Ethernet.
You can override the config for specific Ethernet interface by overriding
the config "config_ethernet_interfaces" and building the image again.
You can find the config format in the file frameworks/base/core/res/res/values/config.xml
Snippet of the format is as follows:
<interface name|mac address>;[Network Capabilities];[IP config]
eth1;12,13,14,15;ip=192.168.0.10/24 gateway=192.168.0.1 dns=126.96.36.199,188.8.131.52
Thanks and Regards,