It needs to be robust against Byzantine attacks. 
simon@venus:~$ cd ~/dcs72b1
simon@venus:~/dcs72b1$ ./gcnclient_ubuntu -n IRCHub -l Sorunome -d d
Info: Using default server host gcnhub.cemetech.net
Info: Using default port 4295
Could not find/open device
Failed to open Direct USB connection to calculator.
simon@venus:~/dcs72b1$ ^C
simon@venus:~/dcs72b1$
and a nother problem is that the batterys of my calc are to low.... 
! 
and a nother problem is that the batterys of my calc are to low.... ! 
--------------------------------------------------------------------------------
SilverLink cable
--------------------------------------------------------------------------------
For SilverLink cable, things are more complicated...
- The following technique can be used for manual setup (using POSIX groups,
as used e.g. on Debian) on udev-using systems:
It may depend on your distribution, but you will have to add a rule to
/etc/udev. As a template, you can create an
/etc/udev/rules.d/20-ticables.rules file with the following rules:
# SilverLink
ACTION=="add", SUBSYSTEM=="usb_device", ATTR{idVendor}=="0451",
ATTR{idProduct}=="e001", MODE="0660", GROUP="plugdev"
# TI-84+ DirectLink
ACTION=="add", SUBSYSTEM=="usb_device", ATTR{idVendor}=="0451",
ATTR{idProduct}=="e003", MODE="0660", GROUP="plugdev"
# TI-89 Titanium DirectLink
ACTION=="add", SUBSYSTEM=="usb_device", ATTR{idVendor}=="0451",
ATTR{idProduct}=="e004", MODE="0660", GROUP="plugdev"
# TI-84+ SE DirectLink
ACTION=="add", SUBSYSTEM=="usb_device", ATTR{idVendor}=="0451",
ATTR{idProduct}=="e008", MODE="0660", GROUP="plugdev"
# TI-Nspire DirectLink
ACTION=="add", SUBSYSTEM=="usb_device", ATTR{idVendor}=="0451",
ATTR{idProduct}=="e012", MODE="0660", GROUP="plugdev"
(Replace ATTR by SYSFS if your very old version of udev doesn't support ATTR).
The template relies on a group called 'plugdev'. If it doesn't exist, you will
have to create it or choose another group which matches better your system.
You will have to add the user to the group 'plugdev' (by using one of the
user/group management tools, or editing /etc/group to add your username after
the ':'). For example, the line will become:
plugdev:x:46:romain
- On some distributions (e.g. Fedora 12), an alternative, groupless setup
detailed in the last section can also be used.
--------------------------------------------------------------------------------
Groupless setup for udev >= 143 with udev-acl and ConsoleKit
--------------------------------------------------------------------------------
The above manual setup methods require users to be manually added to groups to
hand out device access. If this is not desired, on some distributions, it is
also possible to set up the system so the user physically in front of the
computer, if any, gets access to what's assumed to be his/her calculator
automatically. The exact procedure varies depending on the individual
distribution and its age. The following procedure works for systems using udev
143 or newer with udev-acl enabled, such as Fedora 12.
How udev-acl works is that a nice system service called ConsoleKit keeps track
of what user(s) is/are currently logged in locally. The udev-acl tool uses this
information to hand out ACLs for these devices to those users.
To use this setup, create a /lib/udev/rules.d/69-libticables.rules file with
the following contents:
ACTION!="add", GOTO="libticables_end"
# serial device (assume TI calculator)
KERNEL=="ttyS[0-3]", ENV{ACL_MANAGE}="1"
# parallel device (assume TI calculator)
SUBSYSTEM=="ppdev", ENV{ACL_MANAGE}="1"
# SilverLink
SUBSYSTEM=="usb", ATTR{idVendor}=="0451", ATTR{idProduct}=="e001", ENV{ACL_MANAGE}="1"
# TI-84+ DirectLink
SUBSYSTEM=="usb", ATTR{idVendor}=="0451", ATTR{idProduct}=="e003", ENV{ACL_MANAGE}="1"
# TI-89 Titanium DirectLink
SUBSYSTEM=="usb", ATTR{idVendor}=="0451", ATTR{idProduct}=="e004", ENV{ACL_MANAGE}="1"
# TI-84+ SE DirectLink
SUBSYSTEM=="usb", ATTR{idVendor}=="0451", ATTR{idProduct}=="e008", ENV{ACL_MANAGE}="1"
# TI-Nspire DirectLink
SUBSYSTEM=="usb", ATTR{idVendor}=="0451", ATTR{idProduct}=="e012", ENV{ACL_MANAGE}="1"
LABEL="libticables_end" 
Doors CS 7.2 Beta 1
I'll see what I can do.
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