Just in case someone else is interested in this, here is my current solution which works fine but is a bit awkward… For sure it is a quick & dirty hack, but it does what i wanted to achieve so for me it is OK for now.
It consists of three files, tested on Ubuntu, might need modifications for other variations of Unix/Linux/whatever.
Just copy the files into the same directory, make the “.sh” one executable, test them, and if all works fine create a cron job to have them executed regularly.
You also need items for your printers, BrotherPrinter.items:
String DGOfficePrinterStatus
String DGOfficePrinterStatusText
Number DGOfficePrinterBlack
Number DGOfficePrinterYellow
Number DGOfficePrinterCyan
Number DGOfficePrinterMagenta
String KGOfficePrinterStatus
String KGOfficePrinterStatusText
Number KGOfficePrinterBlack
Number KGOfficePrinterYellow
Number KGOfficePrinterCyan
Number KGOfficePrinterMagenta
The item names have to have the hostname of the printer in front, followed by:
- Status - possible values OK, Warning, Error, Etc
- StatusText - Textual status description in your local language, as seen on the printer status page
- Black - ink level (for my printer the maximum seems to be 56, but not completely sure yet)
- Yellow
- Cyan
- Magenta
The main shell script BrotherPrinter.sh:
(the name of your openhabserver needs to be filled in, perhaps also paths to the REST interface modified or for curl/sed/grep corrected)
#!/bin/sh
# set -x
PRINTERNAME=$1
DIR=`dirname $0`
SCRIPT=`basename $0 .sh`
OPENHABSERVER=KGTec1Openhab2Server
OPENHABRESTURL="http://"$OPENHABSERVER":8080/rest/items/"$PRINTERNAME
TEMPFILE=/tmp/$SCRIPT.$$
CURL=/usr/bin/curl
GREP=/bin/fgrep
SED=/bin/sed
CAT=/bin/cat
$CURL -s "http://"$PRINTERNAME"/general/status.html" | $CAT -v | $SED "s#<#\n#g" | $GREP -f $DIR/$SCRIPT.grep | $SED -f $DIR/$SCRIPT.sed > $TEMPFILE
. $TEMPFILE
rm $TEMPFILE
the command file to grep the interesting line from the html BrotherPrinter.grep (note there is a single space after moni):
tonerremain
moni
and a command file to create curl commands using sed BrotherPrinter.sed:
s#.*alt\=\"\(.*\)\" class\=.*height\=\"\([0-9]*\)px.*#\$CURL -s --header \"Content-Type: text/plain\" --request POST --data \2 "\$OPENHABRESTURL"\1#g
s#.*moni\(.*\)\">\(.*\)#\$CURL -s --header \"Content-Type: text/plain\" --request POST --data \"\1\" "\$OPENHABRESTURL"Status\n\$CURL -s --header \"Content-Type: text/plain\" --request POST --data \"\2\" "\$OPENHABRESTURL"StatusText#g
Brief explanation of how/what it does:
BrotherPrinter.sh KGOfficePrinter
it is called with one parameter, the hostname of the printer in question. The item names need to correspond to this hostname as shown in the items file above.
$CURL -s "http://"$PRINTERNAME"/general/status.html" | $CAT -v | $SED "s#<#\n#g"
this line requests the status.html page from the printer using curl, eliminates non-printable characters using cat (there was an issue with german Umlaut and grep), and finally splits the html file into lines - there are for sure better approaches, but again, this works for me. After this the lines I am interested in look like this, although there is far more crap in the output.
.....
dd>
div id="moni_data">
span class="moni moniOk">Bereit
/span>
.....
/tr>
tr>
td>
img src="../common/images/black.gif" alt="Black" class="tonerremain" height="42px" />
/td>
td>
img src="../common/images/yellow.gif" alt="Yellow" class="tonerremain" height="56px" />
/td>
td>
img src="../common/images/cyan.gif" alt="Cyan" class="tonerremain" height="56px" />
/td>
td>
img src="../common/images/magenta.gif" alt="Magenta" class="tonerremain" height="56px" />
/td>
/tr>
.....
then this is reduced only to the interesting lines using
$GREP -f $DIR/$SCRIPT.grep
After this we are getting much closer:
span class="moni moniOk">Bereit
img src="../common/images/black.gif" alt="Black" class="tonerremain" height="42px" />
img src="../common/images/yellow.gif" alt="Yellow" class="tonerremain" height="56px" />
img src="../common/images/cyan.gif" alt="Cyan" class="tonerremain" height="56px" />
img src="../common/images/magenta.gif" alt="Magenta" class="tonerremain" height="56px" />
Using sed:
$SED -f $DIR/$SCRIPT.sed
this is then converted into a temporary shell script:
$CURL -s --header "Content-Type: text/plain" --request POST --data "Ok" "$OPENHABRESTURL"Status
$CURL -s --header "Content-Type: text/plain" --request POST --data "Bereit" "$OPENHABRESTURL"StatusText
$CURL -s --header "Content-Type: text/plain" --request POST --data 42 "$OPENHABRESTURL"Black
$CURL -s --header "Content-Type: text/plain" --request POST --data 56 "$OPENHABRESTURL"Yellow
$CURL -s --header "Content-Type: text/plain" --request POST --data 56 "$OPENHABRESTURL"Cyan
$CURL -s --header "Content-Type: text/plain" --request POST --data 56 "$OPENHABRESTURL"Magenta
which is finally executed inline:
. $TEMPFILE
results can be seen in events.log:
17:18:01.501 [INFO ] [smarthome.event.ItemCommandEvent ] - Item 'DGOfficePrinterStatus' received command Ok
17:18:01.501 [INFO ] [smarthome.event.ItemCommandEvent ] - Item 'KGOfficePrinterStatus' received command Ok
17:18:01.512 [INFO ] [smarthome.event.ItemCommandEvent ] - Item 'KGOfficePrinterStatusText' received command Bereit
17:18:01.518 [INFO ] [smarthome.event.ItemCommandEvent ] - Item 'DGOfficePrinterStatusText' received command Bereit
17:18:01.528 [INFO ] [smarthome.event.ItemCommandEvent ] - Item 'KGOfficePrinterBlack' received command 42
17:18:01.535 [INFO ] [smarthome.event.ItemCommandEvent ] - Item 'DGOfficePrinterBlack' received command 44
17:18:01.545 [INFO ] [smarthome.event.ItemCommandEvent ] - Item 'KGOfficePrinterYellow' received command 56
17:18:01.546 [INFO ] [smarthome.event.ItemCommandEvent ] - Item 'DGOfficePrinterYellow' received command 56
17:18:01.557 [INFO ] [smarthome.event.ItemCommandEvent ] - Item 'DGOfficePrinterCyan' received command 56
17:18:01.558 [INFO ] [smarthome.event.ItemCommandEvent ] - Item 'KGOfficePrinterCyan' received command 56
17:18:01.563 [INFO ] [smarthome.event.ItemCommandEvent ] - Item 'DGOfficePrinterMagenta' received command 56
17:18:01.571 [INFO ] [smarthome.event.ItemCommandEvent ] - Item 'KGOfficePrinterMagenta' received command 56
My printers now show up in habpanel almost nice, but I still have to create something better:
