[Standards] Comments on Chat Markers

Philipp Hancke fippo at goodadvice.pages.de
Thu Jul 4 12:04:09 UTC 2013

Am 04.07.2013 12:45, schrieb Kevin Smith:
> 2) It seems to me that this proposal is providing users with the
> highest assurance of delivery ("This message has been read and
> acknowledged by the user"), when it's possible that some of the
> acknowledged messages were never delivered. This seems serious to me
> in situations like:
> <User A> Something terrible has happened, please send help.
> [S2S blips, message gets lost]
> <User A> There's high winds here.
> [S2S is back, message gets delivered]
> User B now acknowledges the 'high winds' message as read.
> Because of the 'up to this point' nature of the proposal, User A has
> now had it acknowledged that User B has read the message about needing
> to send assistance.

That is a more general problem. Once you cross the s2s boundary, the 
tcp-like property that a party that gets messages A and C has also 
received B does not hold anymore. 0198 partially helps so that you are 
able to recover and resend B, at the cost of mixing up the order on the 
recipient side.

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