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MoQT draft-17 Control Message Types

MoQT draft-17 defines 18 control message types and marks 5 code points reserved — 23 rows in all. The type code is the first field of every control message, so this is the table a decoder dispatches on.

The rows come from the draft's own Control Messages table, not from a hand-kept list. For the field layout of a message, follow its section link into the draft-17 text.

What changed since draft-16

Section titled “What changed since draft-16”

Added

Renamed or retired

  • 0x20 RESERVED — was CLIENT_SETUP in draft-16
  • 0x21 RESERVED — was SERVER_SETUP in draft-16

Removed

  • 0x15 MAX_REQUEST_ID
  • 0x1A REQUESTS_BLOCKED
  • 0xA UNSUBSCRIBE
  • 0x17 FETCH_CANCEL
  • 0x9 PUBLISH_NAMESPACE_DONE
  • 0xC PUBLISH_NAMESPACE_CANCEL

Control message types

Section titled “Control message types”
Type Message Defined in Test vectors
0x01 RESERVED — SETUP for version 00 — —
0x40 RESERVED — CLIENT_SETUP for versions <= 10 — —
0x41 RESERVED — SERVER_SETUP for versions <= 10 — —
0x20 RESERVED — CLIENT_SETUP in versions <= 16 — —
0x21 RESERVED — SERVER_SETUP in versions <= 16 — —
0x2F00 SETUP §9.4 10
0x10 GOAWAY §9.5 4
0x7 REQUEST_OK §9.6 4
0x5 REQUEST_ERROR §9.7 18
0x3 SUBSCRIBE §9.8 19
0x4 SUBSCRIBE_OK §9.9 10
0x2 REQUEST_UPDATE §9.10 8
0x1D PUBLISH §9.11 9
0x1E PUBLISH_OK §9.12 10
0xB PUBLISH_DONE §9.13 11
0x16 FETCH §9.14 8
0x18 FETCH_OK §9.15 5
0xD TRACK_STATUS §9.16 3
0x6 PUBLISH_NAMESPACE §9.17 4
0x8 NAMESPACE §9.18 4
0xE NAMESPACE_DONE §9.19 3
0x11 SUBSCRIBE_NAMESPACE §9.20 6
0xF PUBLISH_BLOCKED §9.21 3

23 rows from the Control Messages table of draft-17. The test-vector column counts the encode/decode vectors moqtap publishes for that type; it is a cross-check, not part of the registry.

Cross-check against the test-vector corpus

Section titled “Cross-check against the test-vector corpus”

moqtap publishes 139 encode/decode vectors for draft-17 across 18 message types, and all three moqtap implementations validate against them. Comparing that corpus with the draft's table is an independent check on this page: all 18 assigned types have vectors.

Neither source has a message type the other lacks.

Where these numbers come from

Section titled “Where these numbers come from”

The table is parsed from table-4 of draft-ietf-moq-transport-17, in the frozen rendering this site keeps at spec-sources/draft-17.html. That file hashes to 64d2e8f543c4d9bcf998d36bf805a752d89d4e02d14082ef4d73258e65a8c1d7, which is the same source_sha256 the moqtap codec's committed registry extraction records for draft-17 — the two inputs are provably the same document.

Control message types are not an IANA registry in the drafts, so they are not part of the codec's registry extraction; the table id above is taken from that extraction's record of the tables it deliberately excluded, which is how this page finds the right table without guessing.

draft-17 error codes · Read draft-17 section by section

Control message types in other drafts

Section titled “Control message types in other drafts”

moqtap covers drafts 07 through 20.

All MoQT control message types, draft by draft · How control messages work