Transfer data back and forth from Multiple Tablets

Hi everyone, after a bit of advice if I may?

I have developed an app, my first, for a company that will have 160-200 tablets out in the field collecting data and looking to send it back in batches to base, where it will be processed and put into a main SQL database developed system.

I am new to Android, so it has been quite a steep learning curve, but basically I have a static data file which holds all the info on the clients, addresses and so forth, and a data file which holds the user...

Transfer data back and forth from Multiple Tablets

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