Add option to print current IP adress(es) to projector

I'm going to use OpenSlides on a Raspi with the ansible scripts and the plan is, that I simply plug it into a network outlet and my laptop into another and then I should somehow find out the IP adress. However I have no deeper access to the network infrastructure and thus have no idea what IP the raspi is going to get assigned. Thus I have no idea how to access the projector. It would be cool if I could setup the raspi at home to display a page with the current IP adress and thus when I plug in the raspi into the projector, I get a big message how to access it. :-)

该提问来源于开源项目：OpenSlides/OpenSlides