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Re: [core] Comments and questions on draft-jarvinen-core-fasor-02

Christer Holmberg <christer.holmberg@ericsson.com> Wed, 20 November 2019 06:03 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Carsten Bormann <cabo@tzi.org>
CC: "core@ietf.org" <core@ietf.org>
Thread-Topic: [core] Comments and questions on draft-jarvinen-core-fasor-02
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Date: Wed, 20 Nov 2019 06:03:41 +0000
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Subject: Re: [core] Comments and questions on draft-jarvinen-core-fasor-02
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Hi,

   >> - Does CoAP allow changing option values in retransmissions? 
   > 
   > Yes, it actually encourages that, e.g.:
   > 
   >    The value is intended to be current at the time of transmission.
   >    Servers that provide resources with strict tolerances on the value of
   >    Max-Age SHOULD update the value before each retransmission.[…]
   >
   > https://tools.ietf.org/html/rfc7252#section-5.10.5

   So, that means that implementations will have to perform a full parse of received retransmissions, instead of only parsing enough in order to detect a retransmission?

In addition, if a retransmission contains updated information, retransmissions will have to be exposed to the application, rather than being handled by the protocol stack.

    > (The interesting part here is eventual consistency — you can’t be sure that the acknowledgement you get is actually for the most recent retransmission.)

    Retransmissions can also be received out of order, and if they contain different information the receiver may not necessarily know which is the most recent.

    Regards,

    Christer

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