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Block3 and block4 option
Is your feature request related to a problem? Please describe.
Block1 and 2 option needs ACK for every block, which slows transmission
Describe the solution you'd like
As described here, http://www.watersprings.org/pub/id/draft-bosh-core-new-block-00.html, new block3&4 options are proposed, which will significantly improve the transfer speed.
This is now RFC9177, coded as #611, and will be apart of release 4.3.2.