Wireless Recycled Reef Controller

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Here are some sample shells scripts:

This first example shows how to loop through 3 temperature sensors and retrieve their current temperature value. The 10 is the family code for the DS18S20?. 



#!/bin/sh
while :  # : always evaluates to true, so a forever loop

   # My 3 DS18S20's.  The ID's I got from doing a 
   # grep '.' /var/1wire/*/temperature
   # This is saying for each one of the following items,
   # do the action

   for i in  /var/1wire/10.F7B64D000800/temperature \
          /var/1wire/10.12BD4D000800/temperature \
          /var/1wire/10.1FBB4D000800/temperature
   do
        cat $i ; echo " $i"
   done # exit the for loop do
# sleep 2 # uncomment if you want a delay, in seoonds
echo " "  # break up each for loop dataset with a blank line
done


Output: 

/tmp # ./temp.sh
      66.875 /var/1wire/10.F7B64D000800/temperature
     67.2125 /var/1wire/10.12BD4D000800/temperature
     66.7625 /var/1wire/10.1FBB4D000800/temperature


Defining Names in NVRAM. This is done on the command line of the router, ie telnet to it. Change the values to match your device. As for naming, it is probably a good idea to come up with some standard prefix for later down the road when we get to the WEB? UI. 

/ # nvram set temp_tank=10.12BD4D000800
/ # nvram commit
/ # nvram set temp_sump=10.F7B64D000800
/ # nvram commit
/ # nvram set temp_hood=10.1FBB4D000800
/ # nvram commit


The script to use the nvram variables 

#!/bin/sh

DEVICEPATH="/var/1wire"

while :
   do
     for i in temp_tank temp_sump temp_hood
      do
         DEVICEID=`nvram get $i`
         cat $DEVICEPATH/$DEVICEID/temperature ; echo " $i"
      done
      #sleep 2

      echo " "
done

-
Output: 

/tmp # ./temp-nvram.sh
        67.1 temp_tank
     66.7625 temp_sump
       66.65 temp_hood

        67.1 temp_tank
     66.7625 temp_sump
       66.65 temp_hood


Putting some time into the script.
With a little bit of work, this can be setup to output to a web directory. A program on the client computer can grab this output and store in a database for historical data. 

#!/bin/sh

DEVICEPATH="/var/1wire"

while :

for i in temp_tank temp_sump temp_hood
   do
      DEVICEID=`nvram get $i`
      TIME=`date +%b-%d-%Y-%H:%M:%S`
      cat $DEVICEPATH/$DEVICEID/temperature ; echo " $i collected @ $TIME"
   done
#sleep 2

echo " "
done


Output:
- 
/tmp # ./temp-nvram.sh
     67.2125 temp_tank collected @ Jan-16-2005-13:40:32
      66.875 temp_sump collected @ Jan-16-2005-13:40:33
     66.7625 temp_hood collected @ Jan-16-2005-13:40:35

     67.2125 temp_tank collected @ Jan-16-2005-13:40:37
      66.875 temp_sump collected @ Jan-16-2005-13:40:37
     66.7625 temp_hood collected @ Jan-16-2005-13:40:37


I've added sed and awk to busybox now. So from command line you can do something like this using the previous temp-nvram.sh 

wrrc1 wrrc-bin $ ./temp-nvram.sh | awk -F @ {'print $2 $1'}


I take the output of "temp-nvram.sh" and pipe it to awk.
awk takes -F @, as my field seperator is @
then in the {} is the awk command to print the 2nd column, then the first.

This is our first formatting example. I could've taken the output and piped it to sort as well if I wanted to sort by temperature (but the temp-nvram.sh example, since it loops and will never end for sort to work)

Output: 

 Jan-01-1970-00:12:14        67.1 temp_tank collected
 Jan-01-1970-00:12:16       66.65 temp_hood collected


Mail Notification Example using nc (netcat)
This is a very rough example using nc to send SMTP? commands to a server for notification. 

 wrrc $ cat nc-mail.sh
#!/bin/sh -e
#
# WRRC email notification using netcat
#
# NVRAM parameters
# WC_smtp the smtp host for outbound email
# WC_notify email address of person for email notification
#
#

WC_smtp=<SMTP Server IP>           # should become an NVRAM variable
HOST=wrrc1.mydomain.com            # The routers hostname and domain
Sender=wrrc@mydomain.com           # The from field in an email
WC_notify=me@mydomain.com          # address to send email to
TIME=`date +%Y-%m-%d:%T`           # Get the data and time
echo "HELO $HOST                   
MAIL From: $Sender                 
RCPT To: $WC_notify                
DATA                               
Subject: WRRC - $TIME

.
QUIT" | nc $WC_smtp 25             # now pipe all that to nc to do the magic



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