Re: [coldsync-hackers] coldsync 1.5.3 nov 27 snapshot

[Andrew Arensburger <arensb+CShackers@ooblick.com>]

On Wed, 29 Nov 2000, Don Duck Harper wrote:
> Ditto...but, it only gives me the one, and then it works...only the very
> first time w/ the new code did it not work.
> 
> On Wed, Nov 29, 2000 at 05:51:45PM -0500, Ryan VanderBijl wrote to To coldsync-hackers-request@lusars.net:
> :-) I just wanted to say that I tried it out on a Visor Deluxe, 
> :-) on a box running linux v2.4.0-test11, UHCI, and it works.
> :-) 
> :-) However, I do still get a lot of error messages:
> :-) 05:41pm rvbijl39@unary ~/coldsync/coldsync-1.5.3% src/coldsync -mb backup -p /dev/ttyUSB1 
> :-) Please press the HotSync button.
> :-) SLP: bad CRC: expected 0x1c80, got 0xbeef
> :-) ACK Timeout. Attempting to resend
> :-) ACK Timeout. Attempting to resend

	Yeah, you're going to continue seeing "Bad CRC" errors under Linux
until the serial device is fixed (or until you comment out that fprintf()
:-) ). When it gets a malformed packet like that, ColdSync doesn't
acknowledge it and waits for the Palm to resend it, just as it's always
done.
	The improvement in v1.5.3 is that it no longer falls over with
"Unexpected data packet. I'm confused!", which was the main reason why it
would fail to complete a sync[1]. Now that it can deal with these cases,
it stands a much better chance of completing a full sync, even on a noisy
serial line.

[1] In case you care: this happened when ColdSync sent out a data packet
and waited for an ACK packet from the Palm. But instead of an ACK, it got
another data packet.
	This can happen if the Palm sent ColdSync a data packet, and
ColdSync acknowledged it, but the ACK got lost or corrupt on the way to
the Palm. In this case, the Palm would resend the data packet again. But
as far as ColdSync was concerned, it had already received the data packet
and send back an ACK.
	In 1.5.3, ColdSync figures that whatever the data packet is, it's
old news, and unimportant. So it sends back an ACK to shut the Palm up,
and tries resending.

-- 
Andrew Arensburger                      Actually, these _do_ represent the
arensb@ooblick.com                      opinions of ooblick.com!
                        Generic Tagline V 6.01


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