A new ID is introduced for publishers and subscribers to be able to
identify different connections in the same session. While it was
possible to do that from the Janus handles this ID is meant to be shared
with the clients and set by the peer sending the offer, so it is set by
the client for publishers and by the signaling server for subscribers
(in which case the Janus handle is used).
This will make possible to know without any ambiguity if an offer/answer
belongs to an already existing connection or not. This can be used, for
example, to know if an offer represents an update or a new connection,
or to discard unneeded messages that might be sent in some corner cases
by the clients.
The ID name is "sid" for consistency with the property name used by the
internal signaling server of Talk.
Signed-off-by: Daniel Calviño Sánchez <danxuliu@gmail.com>
When a publisher has a connection the publisher can update the
connection (for example, to add a video track to an audio only
connection) by sending an updated offer to Janus. Janus detects that,
adjusts the connection and then sends back an answer. Once the publisher
connection is updated Janus starts a renegotiation for the subscribers
and generates the offers to be sent to them.
The signaling server did not handle the event, so the offers were not
sent and the subscriber connections were not updated. Now the offers are
sent as needed, which makes possible for the renegotiation to be
completed by the clients.
In this case the "offer" message will also include an "update" parameter
so clients can differentiate between offers to create new connections or
update the existing one.
Signed-off-by: Daniel Calviño Sánchez <danxuliu@gmail.com>
