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The current formal MQTT protocol specification can be found at:
The current MQTT-SN specification from IBM can be found at:
As questions arise around particular aspects of the specification, we are collecting clarifications:
Topic Format
Security considerations
Are topics dynamic?
Overlapping topics
KeepAlive for the client
Miscellaneous clarifications
MQTT over Websockets
Duplicates on QOS 0
Clarify UTF8 strings
Will Message UTF8 Support
ClientID autogeneration
Ideas (and reasons for why they may be required) are being collected here:
Topic string enhancement
Broker auto-discovery
URL scheme
Status field for acks
Add messageid to ping
Bridge protocol
Extended CONNACK codes
Registered topics like MQTT-SN
MQTT for Centralised Data Collection
Time To Live for retained message
Extended ClientID
Short usernames and passwords