You may want to look at a USB/Lightning to ethernet adaptor if bluetooth configuration is not possible.
I picked up an ethernet adaptor for an Ipad that included a usb port and power-in that works with the Iphones too.
For android, a USB docking station with ethernet may keep you charged or a powered USB hub and USB ethernet adaptor may work.
Check ethernet compatibility with the chip and mobile device, but the Ipad ethernet adaptor was just plug-and-play.