I am currently working on an app for a friend. He has a small restaurant business and I am making a seating/wait-list app for him. Currently the app allows the host to tap seats to show they are taken or free and add people to a wait-list. The wait-list data is using a mySQL db file and the table data is a JSON file. I have them saved just in case the app is closed by mistake. He wants the app to be on two iPads one upstairs and one downstairs. The one downstairs will be plugged into a tv that the guests will be able to see. I currently have it set up where the iPad downstairs mirrors the screen of the one upstairs. The one upstairs has the app running and being used by the host. My issue is he's now suggesting that instead of just having the host upstairs be able to edit it that the host downstairs can as well.
My Question: Is there a way (on iOS) to transmit the data from one iPad to another?
I basically need them both to talk to one another consistently to know when the wait-list/ seating chart has been updated on either one. Once updated on one the data needs to transmit to the other and then be displayed on both. Is this possible? If so how would I go about doing this?