Differences between 3.1.0 and 3.1.1
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 verified to 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 an extra byte for "session present" flag | 3.2.2.2 Session Present |
| 9. | SUBACK can now indicate failure | 3.9.3 Suback Payload |
- MQTT Broker is now MQTT Server
- Message ID is now Packet ID
- Message Type is now Packet Type
