App To App Communication

Hi, i am in the process of designing my first app (so please be patient with me ;-) The app allows 4 users to connect together through the app.

I understand / think that the usual way that apps connect and share information is by:

- data is pushed to the app server
- data is then pulled by the other apps connected to the same service

Obviously this normal method requires a good data signal which is something that i don't want my app to reply on, so...

Question
Is there any other way that you can establish App to App communication without having to go through your App server and pushing and pulling the data... is it possible to establish App to App communication via bluetooth or WiFi or is this against iOS and Android development... thanks in advance for your help...
oo7mlAsked:
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Scott Fell, EE MVEDeveloper & EE ModeratorCommented:
I think the answer to your question is you can use bluetooth.  But the max range is probably in the same room as each other.  

Bump does about what you are asking about and it does sound like they use their servers to do the work and not bluetooth http://bu.mp/company/faq
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oo7mlAuthor Commented:
Thanks, my users will always be within 5 meters of each other... can this be achieved with wifi as i know a lot of users have bluetooth turned off to save power...
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Scott Fell, EE MVEDeveloper & EE ModeratorCommented:
It sounds like it should be possible, but I don't believe it is actually possible.   Then you would need to have some type of firewall built in and just like blue tooth, not everybody has wifi turned on.  

You can make your phone a hot spot, and think of what you need to do that.  So the next step is giving the other user the password you set up.  Then you would somehow have to have layers of security to pass data.

I would say it is good idea but not workable.  You would need to figure your something like bump where you can first establish who in the area is using the app, then how to sync the group by some type of code. From there use push notifications, sms or email.
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oo7mlAuthor Commented:
Ok cool, thanks Padas
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