#!/bin/sh
#
# peter lelie 11-Apr-2010
#
# 23-Jun-2010	changed link to NOAA data source	-pl
# 28-Nov-2010	correction for minus temperatures	-pl
# 24-May-2015	changed link to weather data source	-pl
#
# this script fetches the current Metar weather information for the airport
# specified by LOC, converts it into 'readable' data and puts this weather
# information into the AXIS camera display overlay text, using onboard
# AXIS tools.
#
# please be aware that doing this will wear out the flash memory of the camera,
# which can be typically written about 100k times, but, from my own experience, 
# probably more often.
#
#
# LOC is the ICAO airport code (see http://www.airport-technology.com/icao-codes/)
LOC=EDDL
#
# USR is the root user name of the device and PWD (you guessed it) is of course the root user's password
USR=root
PWD=<your_password>
#
#
PATH=/bin:/sbin:/usr/bin:/usr/sbin
#
# sleep some seconds to settle down the network initialization, if called upon system boot
sleep 15
#
/bin/shttpclient -o /var/tmp/$LOC "http://www.aviationweather.gov/adds/dataserver_current/httpparam?dataSource=metars&requestType=retrieve&format=xml&hoursBeforeNow=3&mostRecent=true&stationString=$LOC"
#
# use the following line if you want to get the original Metar code
# Example: EDDL 111820Z 03010KT 9999 FEW022 08/02 Q1024 NOSIG
#TEXT=$( cat /var/tmp/$LOC | grep \<raw_text\>$LOC | sed 's/<.\?raw_text>//g' | sed 's/^ *//' | sed 's/ /%20/g' | tr -s 'M' '-' )
#
# use the following line if you want to get the simplified version for 'normal' users
# Example: 08°C Dew: 02°C 1024hPa
TEXT=$( cat /var/tmp/$LOC | grep \<raw_text\>$LOC | sed 's/.* \(M\{0,1\}[0-9]\{2\}\)\(\/\)\(M\{0,1\}[0-9]\{2\}\)\(.*\)Q\([0-9]\{3,4\}\)\(.*\)/\1%B0C%20Dew:%20\3%B0C%20\5hPa%20/' | tr -s 'M' '-' )
/bin/shttpclient -u root -w $PWD http://127.0.0.1/axis-cgi/admin/param.cgi?action=update\&root.Image.I0.Text.TextEnabled=yes
echo $TEXT
/bin/shttpclient -o /var/tmp/junk -u root -w $PWD http://127.0.0.1/axis-cgi/admin/param.cgi?action=update\&root.Image.I0.Text.String="$TEXT"
#
# now we're done.