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tags:
all,
apache,
apachecon,
apacheweek,
bryce,
cve,
fedora,
fudcon,
geocaching,
gps,
ha,
jabber,
metrics,
microsoft,
nashville,
north carolina,
oscon,
red hat summit,
security,
trips
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mark :: blog
When I give presentations I have to find something to display the time
(since I never wear a watch), somewhere to put some speaker notes down
(since I sometimes forget a useful point), and then I keep knocking it all
over everytime I go to the laptop to hit space to get the next slide. I'd
quite like to use the laptop display to display my speaker notes and a clock,
but OpenOffice doesn't support doing that yet.
I recently changed to using a smartphone to save carrying around and
having to recharge lots of gadgets. I bought a
Mio A701 which is a nice
phone, PDA, and has GPS in one package. Since the Mio also has bluetooth
I thought that for my presentations at the
Red Hat Summit next week it
would be nice to use the PDA to control the presentation, watch my time,
and give me any speaker notes.
The smartphone runs Windows Mobile 5, unfortunately and I wanted to set
something up quickly and without much effort. I don't mind writing
apps for it, but I'd rather avoid it. So my first thought was to use
vnc, but the vnc client on the pocketpc wasn't great and kept crashing,
and I'd have to create some app to interface with OpenOffice anyway.
Once OpenOffice supports multiple displays it may be more useful to revisit
doing this via vnc.
My laptop runs Fedora Core 5 with a MSI bluetooth USB
dongle plugged in.
Step 1: Get the phone talking to the laptop
This should have been the easiest step, but took an hour to get working
right as I originally struggled getting the phone to connect to a 'serial
port' service.
The commands below were sufficient to advertise
a 'dial up network' service and have pppd handle the connection. I
didn't bother setting up any IP forwarding as I don't need the phone to
be able to use the laptop as a way to get generic network access.
/sbin/service bluetooth start
sdptool add --channel=2 DUN
dund -u --listen --channel=2 --msdun noauth 192.168.1.1:192.168.1.2 \
crtscts 115200 ms-dns 192.168.1.1 lock
Then on the Windows Mobile I added a new connection, selected "bluetooth"
modem, created a new partnership with the laptop DUN service, any
phone number, any username and password (to stop it prompting later),
advanced to remove the "wait for dial tone" option. If you're doing this
from scratch you'll need to play with settings in /etc/bluetooth/hcid.conf
to make sure you set up a PIN for pairing and so on.
Once this is done using the browser on the phone with a URL of
http://192.168.1.1/ causes it to connect, pppd starts, and the phone
happily can
connect to the web server on the laptop. If you want DNS working you'll
need to mess
with the dns IP above or make sure your laptop DNS server is set up to accept
connections on that interface. So far so good.
Step 2: Control the presentation
The next step was to be able to control the presentation. I couldn't see any
nice way to remotely control OpenOffice.org, so a colleague suggested finding
something that used the xtest extension just to inject keystrokes. the X11::GUITest perl module
on CPAN does the job perfectly. So I hacked up a quick perl script you run as
your local user that acts as a web server and on certain requests will inject a
space character into whatever has focus.
Step 3: Speaker Notes
Next step is to get the mini perl webserver to display my speaker notes as well
as the link to the next slide, although, to be honest, I could probably have
committed the notes to memory in the time it took to set this all up.
the trivial little perl script
Created: 23 May 2006
Tagged as: gps
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