RFC 9177

Constrained Application Protocol (CoAP) Block-Wise Transfer Options Supporting Robust Transmission, March 2022

File formats:

icon for HTML icon for text file icon for v3pdf icon for XML
Also available: XML file for editing
M. Boucadair
J. Shallow
core (wit)

Cite this RFC: TXT  |  XML  |   BibTeX

DOI:  https://doi.org/10.17487/RFC9177

Discuss this RFC: Send questions or comments to the mailing list core@ietf.org

Other actions: Submit Errata  |  Find IPR Disclosures from the IETF  |  View History of RFC 9177


This document specifies alternative Constrained Application Protocol (CoAP) block-wise transfer options: Q-Block1 and Q-Block2.

These options are similar to, but distinct from, the CoAP Block1 and Block2 options defined in RFC 7959. The Q-Block1 and Q-Block2 options are not intended to replace the Block1 and Block2 options but rather have the goal of supporting Non-confirmable (NON) messages for large amounts of data with fewer packet interchanges. Also, the Q-Block1 and Q-Block2 options support faster recovery should any of the blocks get lost in transmission.

For the definition of Status, see RFC 2026.

For the definition of Stream, see RFC 8729.

Advanced Search