TCP Socket Terminator

I was asked which “Socket Terminator” we want to use in a project. the guy who is going to remote our patches suggested a NULL-terminator.

as i don’t find any related pins i assume that this just means the last character in a message; known around here as ‘Separator’; am i right?

related to this?

it must be that same thing as with flash,
but no need to worry about getting data the
ascii zero needs to be used only when sending