Please read also this topic.
This will be your complete solution.
Btw, there are other commands for HomePilot, too:
http://HomePilotIP/devices/deviceID
PUT with content type :application/json
SWITCH:
{"name":"TURN_ON_CMD"}
{"name":"TURN_OFF_CMD"}
THERMOSTAT:
{"name":"TARGET_TEMPERATURE_CFG","value":16}
LIST OF DEVICES:
DEVICE STATE:
GET
http://HomePilotIP/devices/deviceID
.
.
EDIT: @anon56373025
For your rollershutter the following commands also should work:
PUT
{"name":"POS_UP_CMD"}
{"name":"POS_DOWN_CMD"}
{"name":"STOP_CMD"}