Does android 2.2 have support for Zeroconf and MDNS related APIs ?
You could use jmdns http://sourceforge.net/projects/jmdns/ I have used it to discover Bonjour/Zeroconf related services with good accuracy with Android 2.2. Depending on your need, you may need to tweak their code a bit in order to get better discovery.
Note that some of older HTC phones have bugs with the multicast, but I think they have fixed it in their recent phones
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