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>3.8. Connecting from Linux to WinCE 2.11</H1
><P
> Submitted by Arthur Tyde and Bryan Abshier of Linuxcare Inc.
</P
><P
> This will tell you how to set up a masqueraded PPP connection via.
IrDA from WinCE to a Linux based notebook computer. Once you are IP
connected, the rest is up to you. We put this together as a guide for
Sony notebook users with Casio E-100/105 PDA's, though the procedure
should work for any WinCE 2.11 device with infrared capabilities
talking to any notebook. Do all the Linux side testing signed on as
root, standard warnings apply.
</P
><P
> Configure WinCE
Configure a network connection for your WinCE device. Go into
"Connections" and create a "Direct Connection" Name it something
meaningful, for device select "Infrared Port". Go into settings and
change the baud rate to 115200, this is the max for WinCE. Go to
TCP/IP settings and check "Use server-assigned IP address," and "Use
software compression," and "Use IP header compression" Make sure "Use
Slip," is unchecked. For Name Servers, make sure "Use server-assigned
addresses" is checked. Go to Start, Settings, Communications,
Identification and enter something for the Device Name. (I used
"cetoy") You most likely already have these values set if you have
synced with a Win9x desktop using Activesynch.
</P
><P
> Configure Linux/IrDA
Set up IrDA support on your notebook (described elsewhere) and get to
the point where your notebook will discover an IrDA compliant device.
A good sign is the irda0 device will show up when you execute
ifconfig. It will not have an IP address, this is ok.
</P
><P
> Setup the Connection
Test the discovery by setting an IrDA device in range of your IR port,
wait 5 seconds, and;
</P
><P
> <B
CLASS="command"
>cat /proc/net/irda/discovery</B
>
</P
><P
> For example, the Ericsson I888 World Phone with IR port enabled should
immediately show something like this;
</P
><P
>
<TABLE
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><FONT
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><PRE
CLASS="programlisting"
> "name:I 888 WORLD ,hint:0x9104,saddr:0x838470e5,daddr:0x152dceaa"
</PRE
></FONT
></TD
></TR
></TABLE
>
Your WinCE machine will not be discovered unless it's actively looking
for a connection. So, if you want to test with WinCE position your
device and double tap on the network icon you created in step 2, you
should see something like this:
</P
><P
>
<TABLE
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><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
> "name:mytoy,hint:0x8204,saddr:0x838470e5,daddr:0x00000b72"
</PRE
></FONT
></TD
></TR
></TABLE
>
The name displayed will be whatever value you have entered into the
Start, Settings, Communications, Identification as the Device Name. At
this point, with basic IrDA functioning- we can move on to
establishing a PPP connection for WinCE. These scripts can also be
used for serial cable connects. Create the following files and copy
them into the directory indicated.
</P
><P
> <B
CLASS="command"
>/usr/sbin/cebox.sh</B
> - make it executable
<TABLE
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><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
> #!/bin/sh
pppd call cebox
</PRE
></FONT
></TD
></TR
></TABLE
>
Because Microsoft likes to break standards, you need the following
chat script. This will feed WinCE the proper ASCII keywords it wants
before allowing a PPP connection.
</P
><P
> <B
CLASS="command"
>/etc/ppp/cebox.chat</B
>
<TABLE
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><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
> TIMEOUT 3600
"CLIENT" "CLIENT\c"
"" "SERVER\c"
</PRE
></FONT
></TD
></TR
></TABLE
>
The following file will allow you to specify the IP addresses, IR (or
serial port if using a cable) device, DNS and so forth. I do not
recommend you change the 192.IP addresses below. WinCE really has an
affection for 192.168.55.100 because all the MS synch tools seem to
have it hardcoded. DNS can be whatever you normally use.
</P
><P
> /etc/ppp/peers/cebox
<TABLE
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><TD
><FONT
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><PRE
CLASS="programlisting"
> /dev/ircomm0 115200 crtscts
connect '/usr/sbin/chat -v -f /etc/ppp/cebox.chat'
noauth
local
192.168.55.101:192.168.55.100
ms-dns 10.2.0.1
</PRE
></FONT
></TD
></TR
></TABLE
>
</P
><P
> Testing the connection
Ok, now you can test the connection to make sure it all works. Reboot
your machine, run irattach /dev/ttyS2 -s (/dev/ttyS2 being the
serial port your BIOS sees the IR device as, if irattach is not
running, start it) Align the IR ports, at the Linux command prompt
type /usr/sbin/cebox.sh, and simultaneously press return to start
cebox and double tap your connection icon in WinCE. You should get a
happy message from WinCE reporting Connecting to Host, Device
Connected, Authenticating User, User Authenticated and finally
Connected. You should see something like this when you are connected:
<TABLE
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><TD
><FONT
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><PRE
CLASS="programlisting"
> irda0 Link encap:IrLAP HWaddr 06:89:d0:58
UP RUNNING NOARP MTU:2048 Metric:1
RX packets:246 errors:0 dropped:0 overruns:0 frame:0
TX packets:251 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:8
ppp0 Link encap:Point-to-Point Protocol
inet addr:192.168.55.101 P-t-P:192.168.55.100 Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1
RX packets:10 errors:0 dropped:0 overruns:0 frame:0
TX packets:10 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:10
</PRE
></FONT
></TD
></TR
></TABLE
>
The following script sets up IrDA, establishes a ppp connection with
WinCE, and then sets up IP masquerading. It is provided as an example
of how you can tie this all together. This is more or less a manual
approach. You can get creative, start irattach at boot and stick a
line in inittab to constantly look for a WinCE connection on the IR
port. This will however, run down your batteries and limit your
ability to access other IR gadgets. I just use the script below.
Position the device, run wince and start communications on your PDA
when the script tells you to.
</P
><P
> <TT
CLASS="filename"
>/usr/local/bin/wince</TT
> - make this executable
<TABLE
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WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
> #!/usr/bin/perl
use strict;
#
# Enable IrDA, start ppp0 and set up WinCE masquerading
# A. Tyde - Linuxcare Inc.
#
print "\n-> Setting up IR infrastructure...\n";
system("killall irattach 2>/dev/null");
sleep 1;
system("/usr/sbin/cebox.sh");
print " Start WinCE Serial or IR networking now!\n";
open(ECHO,">/proc/sys/net/ipv4/ip_forward") or die "Can not open /proc/sys/net/
ipv4/ip_forward";
print ECHO "1";
close (ECHO);
print " Serving 192.168.55.100 to WinCE device...\n\n";
system("ipchains -F");
sleep 5;
system("ipchains -P forward DENY");
system("ipchains -A forward -s 192.168.55.100/32 -j MASQ");
exit 0;
</PRE
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