This command is currently not documented. It allows disabling
the reading of incoming data from the socket, and can be used
as a poor man's flow control.
This feature is currently experimental. It will become the
preferred way to use Websocket handlers once it becomes
documented.
A commands-based interface enables adding commands without
having to change the interface much. It mirrors the interface
of stream handlers or gen_statem. It will enable adding
commands that have been needed for some time but were not
implemented for fear of making the interface too complex.