Constrained Application Protocol (CoAP) Block-Wise Transfer Options for Faster Transmission

Document Type Replaced Internet-Draft (core WG)
Authors Mohamed Boucadair  , Jon Shallow 
Last updated 2020-08-17 (latest revision 2020-06-17)
Replaced by draft-ietf-core-new-block
Stream Internet Engineering Task Force (IETF)
Intended RFC status (None)
Expired & archived
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Stream WG state Adopted by a WG
Document shepherd No shepherd assigned
IESG IESG state Replaced by draft-ietf-core-new-block
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document specifies new Constrained Application Protocol (CoAP) Block-Wise transfer options: Block3 and Block4 Options. These options are similar to the CoAP Block1 and Block2 Options, but enable faster transmission rates for large amounts of data with less packet interchanges as well as supporting faster recovery should any of the blocks get lost in transmission.


Mohamed Boucadair (
Jon Shallow (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)