usb ethernet adapter from plugable.com (http://plugable.com/products/usb2-e100) works,
we need an additional otg adapter (micro usb to standard usb female) between smartphone and ethernet adapter, ( but there is too, an new ethernet adapter with micro usb available ).
and at least, we need a ethernet app from appstore https://play.google.com/store/apps/details?id=xda.usbhost.test&hl=de

and then we can stream PS4 games like flight sims (war thunder) to android smartphone, tablet (sonyz2/sonyz3tablet-compact) with full HD resolution in 60Hz.. stable.

attention: the tiny lag is still there… compared with hdmi video output on big screen!
but its usable.. so there is a video enconding in ps4 working, we can see some artefacts from video encoding at certain still standing screens.. but not remarkable in game plays.