Can i delevop and app that connects to an external device?

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I am working on a project, where I am supposed to make a wireless connection from iOS (iPhone, iPad) to an external device, for sending and receiving some data. I would like to later publish this app on the App Store. At first I wanted to do the connection by bluetooth, but considering Apple's bluetooth MFi policy I had to reconsider this solution.
My next idea is to use wi-fi. The iOS device would connect to the external device through a socket, probably using something like NSStream or CFStream. The external device would be configured as a wi-fi access point, with some kind of a server that stores data sent from the iOS app. The stored data would then be used by the external device to generate a signal for some mechanical actuators. The server would provide the app with data about the actuators.
So my big question is, is this OK by the apple policy? Because if this is possible then I'll sign up for the developer program.

Hello! First thing to check is the LaCie website to see if there's a firmware upgrade for the drive. Second is the drive formatted and HFS+ or did you use it straight out of the box. If that's the case it may be formatted FAT32 which could be the problem. Tom

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Dear @lonza
Do you mean how to manage backups?
Please check this link that might help you.
Regards,
============
Careduro ▓░▓
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lonza wrote:
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