if [[ $1 == "" ]]; then 
  echo "No template file specified"
fi
if [[ $2 == "" ]]; then 
  echo "No serial specified"
fi
if [[ $3 == "" ]]; then 
  echo "No reg number specified"
fi

cat $1 | sed "s/<DEVICE_SERIAL>/$2/" | sed "s/<REGISTRATION_NUMBER>/$3/" > ready_params.json
./req.sh set-device-params ready_params.json