Yes. It works well.
same process as opening and closing the shutter

commands are;
lamp on
http://user1:panasonic@projaddress/c...&lang=e&osd=on

lamp off
http://user1:panasonic@projaddress/c...&lang=e&osd=on

shutter open
http://user1:panasonic@projaddress/c...&lang=e&osd=on

shutter close
http://user1:panasonic@projaddress/c...&lang=e&osd=on

just change the 'projaddress' to your projectors IP address.
set the output of the custom serial device to "no output"