Re: [rtcweb] realiable data service

[Tim Panton <[e-mail]>]

On 18 Jul 2011, at 18:12, Cullen Jennings wrote:

>> 
>> 
>> To put this another way, a reliable protocol associated with a real time stream has some pretty obvious uses (gaming has also already been mentioned).
> 
> I'm pushing back on it is obvious that there are use cases for this. That there is simultaneous need for the semantics of "you must deliver this data no matter how long it takes" and "this data need to get there in less than X time or it is useless" is not obvious to me. 

To my mind,  _sequence_ is vital. 

The protocol should promise to deliver these datagrams to the application layer in the order that they were
sent. If that requires an occasional round-trip delay to cope with packet loss (perhaps with a flag to say it was late),
that's acceptable (but sub-optimal), out-of-order datagrams aren't.  

In the vast majority of cases we can expect it to deliver the datagram in close sync with the associated media.

Tim.