I have concept for an app to be used within a cafe. Basically, the cafe's waiters will all have an android tablet running the app which I am to create. With this app they will be able to take down the food orders that the customers have. What I want to know is how can the food order data from all the waiters tablets be synchronised and sent to the kitchen for the chefs to receive the order one-by-one? This is because multiple waiters will be using the app at the same time so there needs to be a way for the data to be received in the kitchen one at a time.