Instead of relying on the bap_send_cmd and a ring buffer,
the tester will now automatically start transmitting on
streams can that transmit once they enter the streaming state,
and stop again once once they leave the streaming state.
This ensures that we are always sending, which help pass
the PTS tests that require us to send, without having the
autopts client constant telling the tester to send.
This also ensures that we actually send SDUs of the right size
by not relying on a ring buffer, but using a separate thread
that sends data from a predefined array of ISO mock data.
This is easily expandable to multiple streams (including a mix
of unicast and broadcast) using different SDU sizes and easy to
expand to also use one or more software codecs.
The design is based on the TX thread for the BAP Unicast
Client sample and the audio babblesim tests.
Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>
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