[zsupalla]

The cloud back-end is open source so you can do that:

http://www.github.com/spark/spark-server

[mark-r]

How hard is it to reprogram the device to use your own server using that back end? How about if you wanted to do your own back end?

[mcescalante]

I believe that to do this without using any of the existing firmware you would just want to grab a JTAG programmer and flash your own version of their firmware, or a custom blend of something. Flashing it is easy and they've got plenty of instructions on the web.

[middleca]

You can actually do this with a usb cable, or flash your own firmware over the air, you'd only need a jtag programmer if you wanted to replace the open-source bootloader :)

[Florin_Andrei]

I'm assuming it's just one function call?