Older clients (e.g. Makito encoders) don't support streamid and
couldn't send a stream. This adds support for v4 clients. Such
clients will always be publishing to the resource equal to the
client address, e.g. 192.168.1.42:63793
Clients that want to play this stream are required to send a
streamid with the respective resource name.
The streamid format that starts with #!: is recommended in the SRT
specs but it usually causes trouble where you're limited in the
use of such characters. Some hardware devices will not accept such
streamids.
The alternative format is simpler and has the form
[resource](,token:[token])?(,mode:[mode])?
token and mode are optional. mode can have the values "publish" or
"request". If mode is not provided, a value of "request" is
assumed.
