IPAD App for SAP without Middleware

Hi experts,
I am new about mobility topics and I am involved in a new project that consists in developing iPAD apps using data from SAP ECC and saved into the tablet.
In my business scenario there will be about 1.000 users that need to synchronize data from SAP ECC with the following characteristics:
Volumes
Basically there are 2 type of data to store into the iPAD:
Clients assigned in Portfolio (about 1500 clients per User to download)
Static data (i.e. configuration table/parameter)
Let's assume that the size of data exchanged is about 3 Megabyte
Frequency
The initial upload has to be made once a year and thereafter once a day it should be checked for updates
At the very present time we are supposing to use web services calling SAP ECC in order to retrieve and store data.Is there any particular drawback in doing it without a Middleware?
I have heard about Sybase, but I cannot find the real advantage since it seems to be another database where data can be replicated into it. As for the device management console, my client is adopting yet AirWatch.
I have also heard about SAP Netweaver Gateway but I cannot catch the real advantage into using it.
Thanks
E.

Hi Emanuele,
In your case, SUP would provide the development tools, framework and APIs to easily handle the authentication, synchronization etc. You wouldn't need to define your own synchronization mechanism, it's in the product. Now if the updates are only sent from the server to the mobile devices, this shouldn't be to difficult to handle even without SUP.
You could easily create REST Web Services using Gateway and then consume them using the mobile devices. You don't want to consume SOAP Web Services using a mobile application, trust me. You could do this using the ICF (Internet Communication Framework) to  achieve this but again it would be easier with Gateway.
You don't necessarily need SUP or Gateway to create only a simple mobile application. But then if your customer is happy with their first mobile application, they'll want more. And then products such as SUP or Gateway can make the difference. These products prodvide a standard development environment, tools to manage the apps and the users etc. With multiple mobile apps connected to multiple back-ends with more and more users, you'll need a middleware to manage all this and make sure the performance is great.
Usually people don't use SUP or Gateway for their first mobile application but then they start to see the benefits of mobility and they want more. And then they start to realize the benefits of these products and they understand that a real mobile strategy has to be defined etc.
Regards,
Pierre

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