This is a browser based serial Lanc control that will connect with the Sony or Canon camera remote control interface. It only works using Chrome which has serial control enabled. Over the years Sony has changed the codes used to control the camera. The old codes date back to tape cameras whereas the new ones are for SD card types. That said they change so I've included a search. Codes have two bytes from 0000 to FFFF. Old ones start 28** for the camera, 18** for the VTR. The new camera use D***.
You may also need to enable experimental web platform if it is not supporting serial.