Hi,
you might have heard of Mocha W32 PPP (mPPP, http://www.mochasoft.dk ), a
Windows application that allows you to use the cradle/serial connection as
a direct PPP line. As I understand it, the Palm settings are direct/serial
for the connection and PPP for network. If you start a TCP/IP connection
from, say ProxiWeb, the Palm should intitiate a PPP connection, which is
answered by mPPP on the PC side. Any TCP/IP packets are then
forwarded/routed to Internet connection of the PC (LAN, modem etc.)
Unfortunately I have a Macintosh and no such thing as mPPP seems to exist
for the Mac. So write the software yourself, right? Well, I got stuck right
in the beginning and have hundreds of questions now :-))))
My setup is: PalmV in its cradle connected to the Mac's serial port
(modem). Baud rate set to 19200. Starting a web-site from Proxiweb. This
invokes all the data link layers (I hope). On the Mac side I currently just
read the raw hex data-stream from the serial port.
From all the RFCs that I found on the topic PPP, I "assume" that PPP over
the serial port conforms to RFC1662 which describes "PPP in HDLC-like
Framing". Perhaps this is the first wrong assumption? If I look at the
data-stream it starts with the sequence:
7E FF 7D 23 C0 21 7D 21 7D 21 7D 20 ....
So I think I see here the FrameFlag (0x7E) followed by an all stations
address field (0xFF). This part is o.k. However, the next octet should be
the control field, which RFC1662 states should be 0x03. I have 0x7D there.
The next part should be the PPP encapsulation (RFC1661). 16 Bit for the
protocol field, i.e. 0xC021. Great, that stands for link control protocol
(LCP). That should be followed by the code field (I would expect a
configure-request code = 1 here), but 0x7D makes no sense in that context,
neither the following part.
So what's wrong? I have no parity, 8 data bits, 1 stop bit (tried others)
for the Mac's serial port, but I couldnt find any description for the Palm
(any hints?). What framing protocol is used for the Palm serial port? Might
it be a cabling problem? I heard the serial cable connection of the cradle
is different from a modem cable (no commercial available?). But then I
would expect that the whole connection doesnt work. I really need some
documentation on the data-stream that is produced by the combination PPP,
direct/serial on the Palm.
Any help is greatly appreciated, Andreas
*************************************************
* *
* Dr. Andreas Wolf *
* Abteilung Biophysik *
* Albrecht-von-Haller-Institut *
* f�r Pflanzenwissenschaften *
* Uni G�ttingen *
* Untere Karsp�le 2 *
* D-37073 G�ttingen *
* *
* http://www.biophysik.uni-goettingen.de *
* *
*************************************************
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