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The primary interface for this firmware was so far HTTP. This protocol
is not suitable for small and bidirectional messages which are
time-critical.
If something like this needs to be implemented with HTTP the best
approach is likely long-polling which at least makes it possible for the
server / the firmware to send data to the client / user as reaction to
an event like a closed door sensor.
TCP would fix this issue and is a good choice. Nevertheless web clients
are not allowed to open TCP connections for security purposes.
Thus the WebSocket protocol was created to fill this gap.
To not duplicate the any effort the WebSocket API should be used for
small, time-critical messages for all clients (one with TCP support like
CLI tools as well as web clients).
HTTP is still kept to provide a web page but also for functionality
where HTTP is more suitable like firmware uploads.
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