Communication between Spider(Cobra II) and Cerb40

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I have Spider mainboard and Cerb40. I need that my Cerb40 send some data to Spider every second (one day to Cobra II), and spider(Cobra II) send some data to Cerb40 every 20 minutes. When I say data I mean a few bytes.

Which approach should I use? I2C, SPI, UART, Network (HTML, Sockets) …

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I would use uart…

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UART - simplest approach, can do automatic detection of line end characters, easy to debug with a TTL-USB serial cable (here’s the one we use - http://www.ftdichip.com/Support/Documents/DataSheets/Cables/DS_TTL-232RG_CABLES.pdf) and a PC terminal program…