I started noticing some erratic behavior with my code, and after some digging around it looks like the WiShield stack & driver have a memory corruption issue. The default setting creates a 400 byte buffer, but then the driver code writes 417 bytes into it. Hmmm, that's not good. I submitted details to Async Labs, hopefully they can fix it soon.
In the meantime, I've set the TCP window size to 300 bytes and added a 'safey malloc' to put a little space between my data and the stack code.
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