This is the high-level HTTP control.

[keynet]

This is the higher-level HTTP control.
No need to enable "simple IP control" on the TV - works without (e.g a Bravia 2015 KDL40W-705)

As far as the TV is concerned "Simple IP control" is per Sony doc "Sony Simple IP Control Protocol for BRAVIA" - "The protocol has 24 bytes fixed-size data format.." It's just firing packets, control and status reporting. Doc claims all the lower level functions are available in the HTTP version, unclear how the notifies would work though.

Found more details here - this is the pro stuff, but consumer appears similar if not identical.
https://pro-bravia.sony.net/develop/integrate/ip-control/