Constrained firmware update problem statement

Document Type Expired Internet-Draft (individual)
Author Michael Richardson 
Last updated 2017-10-18 (latest revision 2017-04-16)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document details the problems of upgrading small devices that need complete firmware replacements, but which do not have enough storage to keep an entire copy of the replacement image. In addition to detailing the specific challenge, a conceptual architecture for a solution is posited involving use of DTLS session resumption tickets with CoAP Block Transfer mode.


Michael Richardson (

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