very useful ressource: http://mendelonline.be/sony/sony.txt

totally awesome tool: https://stedolan.github.io/jq/

#!/bin/bash
#set tv hostname or ip here
tvname="bravia.loc"
#set tv item name in oh here
tvitemname="Bravia_Power"
DEBUG=0
while true
do
while ping "$tvname" -c 1 > /dev/null
do
        oldstatus=$status
        status=$(curl --silent -i -X POST -H "X-HTTP-Method-Override: PUT" -H "Accept: application/json" --header "Content-Type: text/plain" --header "Accept: application/json" -d '{"id":4,"method":"getPowerStatus","version":"1.0","params":["1.0"]}' "http://bravia.loc/sony/system" 2>&1 |tail -1 |jq ".result[0] .status")
        [[ DEBUG -eq 1 ]] && echo Status=$status
        if [ x$status != x$oldstatus ]; then
        if [ $status = \"active\" ]; then
                [[ DEBUG -eq 1 ]] && echo Sending ON to openhab
                curl -X PUT --header "Content-Type: text/plain" --header "Accept: application/json" -d ON "http://localhost:8080/rest/items/$tvitemname/state"
        else
                [[ DEBUG -eq 1 ]] && echo Sending OFF to openhab
                curl -X PUT --header "Content-Type: text/plain" --header "Accept: application/json" -d OFF "http://localhost:8080/rest/items/$tvitemname/state"
        fi
        fi
        sleep 5
done
sleep 10
done

cat /etc/systemd/system/bravia.service

[Unit]
Description=monitor tv status
After=syslog.target,openhab.service

[Service]
Type=simple
WorkingDirectory=/opt/openhab2
ExecStart=/opt/openhab2/bravia.sh

[Install]
WantedBy=multi-user.target