[core] Time Scale Option

[Laurent Toutain <[e-mail]>]

Hi,



We have published few month ago a draft defining a new CoAP option.


https://datatracker.ietf.org/doc/draft-toutain-core-time-scale/


The main idea is to inform a server when devices will not have the same
reaction time. Current CoAP RFC defines a default 5 minutes window during
which any message will be consider as a retransmission.  This delay is too
small for LPWAN network, where small bandwidth, duty cycles are introducing
larger delays. One solution is to change the default window value, but this
period will be too long for “regular” devices and force the server to
memorize more message ID.



That’s why we propose the Time Scale option, the client informs the server
of the window period where messages will be considered as retransmitted.
The server will be informed for this device and will adapt its timers.



We would like to know, as we discussed during London IETF, what is the
position of the core wg on this option.



Ana and Laurent