WinCE FTP

Attribution: This is based on a similar process for linux outlined at http://www.handhelds.org/minihowto/wince-link/index.html.

You need the WinCE Internet Explorer, a serial cradle, and a Plan 9 terminal with a serial device. The idea is to run an FTP server on the terminal, establish a PPP connection to the ipaq, and use WinCE's IE to download files.

Customize ppp(8) to skip authentication when run as a server. This is necessary because it is not evident how to set a WinCE user and secret for CHAP. Here is a patch to the February 21, 2003 version of ppp.c that disables authentication when given an empty secret (with -s ''):

	/sys/src/cmd/ip/ppp/ppp.c:16 a ppp.c:17
	> static	int	skipchap = 0;
	/sys/src/cmd/ip/ppp/ppp.c:253 c ppp.c:254
	< 		if(server)
	---
	> 		if(server && !skipchap)
	/sys/src/cmd/ip/ppp/ppp.c:2617 a ppp.c:2619,2622
	> 		if (strlen(secret) == 0) {
	> 			secret = nil;
	> 			skipchap = 1;
	> 		}

Run an FTP server and your custom PPP server on the terminal. The following examples illustrate what you might send to an interactive rc(1).

• Choose an unused IP address for the bitsy. You also need your terminal's IP address.

	bitsyip=192.168.1.22
	termip=`{ndb/query sys $sysname ip}

• Create a directory to hold configuration files and your FTP server's root directory.

	root=/usr/$user/tmp/bitsy
	mkdir $root

• Create an FTP root directory and namespace(6) file.

	mkdir $root/ftp
	echo 'mount #s/boot' / > $root/namespace.ftp
	echo 'bind '$root'/ftp /' >> $root/namespace.ftp

• Use listen1 (in listen(8)) and ftpd (in ipserv(8)) to run your FTP server:

	aux/listen1 -tv tcp!*!ftp /bin/ip/ftpd -An $root/namespace.ftp &

• Create a chat file for dealing with WinCE's pre-PPP text.

	echo ''''' CLIENT' > $root/chat
	echo 'CLIENTSERVER ''''' >> $root/chat

• Run your modified ppp(8) server; this example assumes the ipaq is connected to /dev/eia0 and your custom binary is called "myppp".

	myppp -p /dev/eia0 -b 115200 -f -s '' -S -uM $root/chat $termip $bitsyip

You can test your FTP server in another window with "ftpfs $sysname". After logging in as none, you should see the contents of $root/ftp under /n/ftp.

Configure WinCE to talk to the terminal and establish a PPP connection. The following worked with WinCE 3.0.9348 (Build 9616). See http://www.handhelds.org/minihowto/wince-link/index.html for alternative instructions.

• In Start, Settings, Connections, PC, create a new connection called 9 with PPP, the $bitsyip IP address, 115200 baud, eight data bits, no parity, one stop bit, hardware flow control, and autosync turned off.

• Run Start, Programs, Connections, 9.

You can test the connection with "ip/ping $bitsyip" on your terminal.

	ftp://$termip/