Cacheing and JSON

I have a JSON api exposed writen in django, in which remote devices ask if there are any commands for the device. 

 And 99% of the time, the answer is no.  

I've played around with database cacheing, and the problem i've run into is, it can take several minutes until the new command gets sent to the device.

Does anyone have an idea of the best way of doing something like this.

The commands come in via JSON also, if that helps.  

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Thanks
Kevin Anthony
www.NoSideRacing.com

Do you use Banshee?

Download the Community Extensions:

http://banshee.fm/download/extensions/

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