update domoticz scene timer to close roller shutters at dusk but not before 8pm and not after 10pm at Paris location

domoticz-closerollershutters.sh

#!/bin/sh
#
# domoticz-closerollershutters
# use sunwait to get civil dusk time to calculates when to close roller shutters with the constraints to be in this interval >20h <22h, civildusk i.e. min(max(civildusk,20h),22h)

tdusk=`/usr/local/bin/sunwait -p 48.866667N 2.333333W | grep "Sun rises" | sed "s/^.* sets \([0-9]*\) .*$/\1/g"`
hdusk=`echo $tdusk | cut -c 1-2`
mdusk=`echo $tdusk | cut -c 3-4`
sdusk=`date -d"$hdusk:$mdusk" +%s`
notbefore=`date -d"20:00" +%s`
notafter=`date -d"22:00" +%s`
# max(sdusk,notbefore)
temp=$(($sdusk>$notbefore?$sdusk:$notbefore))
# min(ans,notafter)
result=$(($temp>$notafter?$notafter:$temp))
hdown=`date -d@$result +%H`
mdown=`date -d@$result +%M`

isvacation=`curl -s "http://localhost:8084/json.htm?type=devices&rid=43" | grep Status | sed 's/^.*Status.* : "\([^"]*\)",$/\1/g'`
if [ "$isvacation" = "Off" ]
then
  echo we are not on vacation, fine: setting shutter closing time to $hdown:$mdown
  # close roller shutters
  ACTION=updatescenetimer
  t=4
  curl "http://localhost:8084/json.htm?type=command&param=$ACTION&idx=$t&active=true&timertype=2&hour=$hdown&min=$mdown&randomness=false&command=0&days=1234567"
else
  echo lucky us: we are on vacation, no change
fi