Re: ADTPro beta - protocol change

["schmidtd" <schmidtd@my-deja.com>]

While doing destructive testing on ADTPro 0.1.5, I noticed that
dropping an acknowledgment packet (entirely possible via UDP or Audio
transports) can result in corrupt image transfers.  The problem is
that the host, sensing a timeout, resends the packet.  If the Apple
had already acknowledged it but that ack got lost, the resent packet
was written as the next one in line.  Definitely bad.  I added block
numbers to the protocol so now we know _which_ blocks are getting
acknowledged or sent.

This change, starting with the just-released version 0.2.1, makes the
protocol incompatible with the 0.1.x line.  There is a checkbox in the
server GUI to revert to the old protocol to help get the new client
moved to the destination using an existing, older client.  DOS ADT
compatibility is unaffected by this change.

A couple of other fixes are included, too: a crash on a max-length
ProDOS volume name (thanks to James Putnam for going the extra mile to
snail-mail me a physical floppy exhibiting the problem as we tried to
figure out what went wrong), and the rxtx serial library is now
optional to install (if you plan to use UDP or Audio instead).

See documentation and download information here:
http://adtpro.sourceforge.net