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Differences between 3.1.0 and 3.1.1

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Nicholas Humfrey edited this page Aug 6, 2014 · 20 revisions

Differences between versions 3.1.0 and 3.1.1 of the MQTT specification:

3.1.0 specification: http://public.dhe.ibm.com/software/dw/webservices/ws-mqtt/mqtt-v3r1.html

3.1.1 specification: http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/mqtt-v3.1.1.html

No. Description Reference in 3.1.1 spec
1. Strings must all be valid UTF-8 1.5.3 UTF-8 encoded strings
2. Protocol name has changed to MQTT 3.1.2.1 Protocol Name
3. Protocol level has changed to 0x04 3.1.2.2 Protocol Level
4. ClientIds MAY contain more than 23 encoded bytes 3.1.3.1 Client Identifier
5. ClientId MAY be zero bytes long 3.1.3.1 Client Identifier
6. ClientId MUST actually be UTF-8 3.1.3.1 Client Identifier
7. ClientId MAY be restricted to alphanumeric chars 3.1.3.1 Client Identifier
8. CONNACK has new "session present" flag 3.2.2.2 Session Present
9. SUBACK can now indicate failure 3.9.3 Suback Payload

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