While it's on my mind, I want to write another
description of the Nantucket surveillance system for you.

The video surveillance program is called "motion" and
is invoked at the appropriate time with the command "motion -s"
motion -s runs in the foreground and can readily be stopped
with control-C. "motion" without the "-s" flag is the standard routine
for continuous surveillance; it runs as a demon, which I don't know
how to stop except by shutting down the computer. As presently programmed,
"motion" generates about 64.7 Kbytes per second, or about 5.59 gigabytes
per day, and would fill a 150 gigabyte hard drive in 26 days.

On the Nantucket computer the images generated by "motion -s"
from the four cameras are stored in directories named
/usr/local/apache2/htdocs/cam1
/usr/local/apache2/htdocs/cam2
/usr/local/apache2/htdocs/cam3
/usr/local/apache2/htdocs/cam4
The pathname of the executable file "motion"
on the Nantucket computer is /usr/local/bin/motion.
The configuration file for "motion"
is /usr/local/etc/motion.conf.
The motion package is stored in
/usr/local/motion

You start your surveillance session by dialing 1-508-228-3836.
When you hear 3 beeps, push 4, wait one second, push *
This sequence turns on power to the Nantucket computer.
After 10 seconds, you may repeat it just to be sure.
Then hang up the phone.

Next on the Belmont computer
you enter ftp ftp-www.earthlink.net 
At the prompt type jochenmeyer (one word)
The password is mut12z
When your login had been acknowledged
type "dir local_address"
This will give you the directory entry on the web_site,
giving the time (GMT) at which "local_address" was uploaded
from the Nantucket computer.
If this is a daily routine, the old local_address will
list the previous day's time stamp plus 5 hours for GMT.
If the Nantucket computer has started properly and hasn't
been trapped into a rom-bios routine,
then, three to four minutes
after the Nantucket computer
has been started with the 4 * signal.
the local_address will change to today's date.
If you still get yesterday's date
don't logout of the ftp routine,
wait a minute or two,
then simply use the up arrow
to repeat the  dir local_address command.
If after 5 minutes, local_address hasn't been updated,
pick up the phone again, dial 1-508-228-3836, but this time,
after the three initial beeps, unpower the Nantucket computer by
pressing 4 then pressing #  Two beeps will tell you the power
has been turned off.
Then press 4 again and *  Three beeps will tell you the power
has been restored, and you hope that the Nantucket computer
is recycling. Keep repeating the dir local_address command
on the ftp connection. Once the local_address has been updated,
type the command: get local_address and when this is accomplished
exit ftp using quit or exit or Control-C.
Now look at the local_address file
by typing vi local_address or cat local_address
The next to the last line will give you
the current local address
which you use as an argument to ssh
The first response to a successful ssh login
will be a query which you should answer with yes
three letters written out.
The second response will be the request for the password
for meyer which is Mut12z (note upper case M)

The login directory on the Nantucket computer both for "ssh"
(the safe shell login program) and for sftp (the safe file
tranfer protocol, is /usr0/meyer. ssh will not login as root,
but once you have logged in, for reasons which I haven't explored,
superuser privileges are required to execute the other programs.
The password for the initial login is "Mut12z" - note the upper-case M.
Then type "su" (enter); the password is "wurzel" Next type
the command ./trans00. trans00 is a batch file consisting of
commands:
rm /usr/local/apache2/htdocs/cam1/*
rm /usr/local/apache2/htdocs/cam2/*
rm /usr/local/apache2/htdocs/cam3/*
rm /usr/local/apache2/htdocs/cam4/*
which removes all old
image files from the apache2/htdocs/cam* directories.
The apache2 directory has no function except to store images
as they are generated by "motion".
(This directory has nothing to do with the apache
web server.) The next command in the ./trans00 file is 
rm /usr0/meyer/trans10/*  which removes all old image files
from /usr0/meyer/trans10

After the ./trans00 command, type "motion -s" (enter) A cascade of
debugging data will flood across the screen. After about 5 seconds,
type Control-C  The garbage from motion -s will stop. At the prompt,
type ./trans01 (enter). This ./trans01 command is 
cp /usr/local/apache2/htdocs/cam*/* /usr/meyer/trans10  
The ./trans01 command copies the newly generated image files
in /usr/local/apache2/htdocs/cam[1234]/* to
/usr0/meyer/trans10

You're now ready to download the new images. I use alt-F3 aor some
such alt-F? command to switch to a different screen, still in
/usr0/meyer (Belmont). I have a directory tree, such
as /usr0/meyer/Ack01/090310 with the day's directory.
I change directory (cd) to the directory for the day.
Type sftp with the local_address as argument, e.g. sftp 4.154.248.31 
This will get you an sftp login prompt for the password, which
again is Mut12z. Now on the remote (Nantucket) computer change
directories "cd trans10"  trans10 being the directory containing
todays image files. When the directory change is acknowledged,
type mget *    mget is the ftp get mutiple files command, the
asterisk (*) is a wild-card character which references all files.

You don't have to wait for the image files to be downloaded.
It's a relatively slow process; but you can switch to your X-Windows
screen (alt-7) and use an image viewing program (I use Kview)
to look at the pictures. 

When you're satisfied with the iamges, switch back using Alt F?
to the screen from which you executed ./trans00 motion -s and 
trans01, and type "shutdown now" no hyphen preceding the now.
You should get a shutdown confirmation right away. 

You can now pick up the phone 1-508-228-3836, when you hear
the three beeps push 4, wait a second, push #.
You'll hear two beeps, which mean that power to the computer
has been turned off.

That's all there is to it.

===============================
A switch in the rom-bios boot menu provides
that the computer should boot when power is turned on.

All the commands described below and the files listed
are on the Nantucket computer.
As the Nantucket machine goes through its boot routine
it traverses all the files in the directory /etc/rc.d
and a subdirectory /etc/rc.d/init.d
This subdirectory /etc/rc.d/init.d contains a file "functions"
/usr/etc/rc.d/init.d/functions
the last line of this file is the command
/usr0/meyer/PPP/cmd00_ack which is a shell file
that looks like this:

# /usr/meyer/PPP/cmd00_ack
date
ifconfig eth0 down
cp /dev/null local_address
/usr/sbin/dunlink
(pppd connect "chat -f /usr0/meyer/PPP/dial_netcom_nantucket" /dev/ttyS0 38400 -detach crtscts modem defaultroute debug name kbmeyer@ix.netcom.com logfile local_address -vjccomp)&
echo Login started
sleep 60
cat local_address
echo Now uploading local_address
ftp ftp-www.earthlink.net
==========================
# /usr0/meyer/PPP/dial_netcom_nantucket

''            ATZ
OK            ATDT5083321005
CONNECT       ''
ogin:         kbmeyer@ix.netcom.com
word:         mut11z
''            ''
===========================
#/usr0/meyer/.netrc
#/root/.netrc
#/etc/rc.d/init.d/.netrc
machine ftp-www.earthlink.net
login jochenmeyer
passwd mut12z
macdef init
dir
put local_address
quit
===========================
## These are my annotations on the files listed above ##

# /usr/meyer/PPP/cmd00_ack
date
ifconfig eth0 down # ethernet protocol competes with ppp protocol
                   # therefore disable ethernet device
cp /dev/null local_address
                   # clear local_address
/usr/sbin/dunlink
                   # an obsolete routine for disabling eth0

(pppd connect "chat -f /usr0/meyer/PPP/dial_netcom_nantucket" /dev/ttyS0 38400 -detach crtscts modem defaultroute debug name kbmeyer@ix.netcom.com logfile local_address -vjccomp)&
                   # the routine which calls the ppp demon to connect the modem
                   # The ampersand (&) makes the program run in the background
                   # chat is a communications program

echo Login started
                   # a marker to indicate progress
sleep 60
                   # sixty second delay to give modems time for handshaking
                   # before calling ftp to upload local_address
cat local_address
                   # local_address is actually the logfile for pppd connect,
                   # local_address will be uploaded in its entirety
                   # by the Nantucket computer to
                   # ftp-www.earthlink.net/jochenmeyer and downlaoded 
                   # from there by the Belmont computer. 
echo Now uploading local_address
ftp ftp-www.earthlink.net
                   # The uploading is done by the ftp command
                   # which takes instructions from a file .netrc 
                   # I never experimented to determine exactly
                   # where ftp looks for .netrc, so I put copies
                   # of .netrc in /usr0/meyer, in /root
                   # (because ftp is called by root)
                   # and in /etc/rc.d/init.d
                   # probably /root is the only essential location
                   # for .netrc
==========================
# /usr0/meyer/PPP/dial_netcom_nantucket
              # This is the modem control file for "chat"

''            ATZ
OK            ATDT5083321005
CONNECT       ''
ogin:         kbmeyer@ix.netcom.com
word:         mut11z
''            ''
===========================
              # This is .netrc
#/usr0/meyer/.netrc
#/root/.netrc
#/etc/rc.d/init.d/.netrc
              # I've forgotten the syntax
              # machine obviously binds .netrc to the ftp command
machine ftp-www.earthlink.net
              
login jochenmeyer
passwd mut12z
macdef init
              # macdef I interpret as macro definition
              # init I interpret as initial routine
dir
              # dir is the directory command
              # which I thought might be useful 
              # to initialize the process
put local_address
              # the put command uploads to the website
              # the local_address file which is the logfile
              # that has just been generated by pppd connect
              # local_address give the information required
              # to address the Nantucket computer on the Internet.
quit
===========================