WhatsApp seems to use XMPP
I recently googled a bit around about WhatsApp and found an analysis of WhatsApp on Android. Interesting thing is that they seem to use XMPP, aka Jabber. I couldn't find anyone yet which tried implementing it on top of a normal XMPP client but it would probably be worth trying it. I don't have time right now otherwise I would try to get my hands on the Android version and debug it with Wireshark. If it is really more or less Jabber then at least basic functionality should work rather easy on WebOS.
Also a friend told me that the Android version can be decompiled as it is Java so that might be another starting point.
I wanted to post the link but the forum doesn't let me because I do not have 10 posts yet (geez) so put it together yourself: http :// shakal.blog.de/2011/03/22/whatsapp-risiken-10872342/ (German only, sorry)
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