Device Driver - before I start

Is there a helping hand to give me some advice where / how to start?

I want:
=2D a "pseudo device", which collects every now and then data from an exter=
nal
box via serial line (/dev/cuaa1)
Box-Status and some more information shoud be readable,
whichever Commands have to be sent to the Box could be done via ioctl
=2D using FreeBSD 4.10 ( going to 5.x later)
=2D I am currently reading:
FreeBSD Handbook and Developers Handbook
Daemonnews: Oct 2000: KLD example / Tutorial
/usr/src/share/examples/driver/make...
( and McKusik's Design ...)
=2D And finally: this is going to be my first Unix-Driver ...
(although, I have some experience in low-level programming)

I need Infos on:
=2D is there a "better" (or "more preferred") way than written above?
=2D is there a "simple example driver" doing similar things
=2D actually, can I simply access /dev/cuaa1 from "inside" a driver ?
(suppose, I should not ...)
=2D or should I simply / better stay with a daemon ?

thanks in advance for hints!

=2D-=20
Mit freundlichen Gr=FC=DFen

Richard K=E4stner
EDV-Beratung
Woerthgasse 17
2500 Baden
Austria
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