[jira] [Created] (AMQ-5058) Broker MUST respond with CONNACK with return code 0x02 for zero length client id and 0 cleansession

["Dhiraj Bokde (JIRA)" <ji...@apache.org>]

Dhiraj Bokde created AMQ-5058:
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             Summary: Broker MUST respond with CONNACK with return code 0x02 for zero length client id and 0 cleansession
                 Key: AMQ-5058
                 URL: https://issues.apache.org/jira/browse/AMQ-5058
             Project: ActiveMQ
          Issue Type: Bug
          Components: MQTT
    Affects Versions: 5.9.0
            Reporter: Dhiraj Bokde
             Fix For: 5.10.0
         Attachments: AMQ-5058.patch

The CONNECT.decode() method from mqtt-client had an issue which has been fixed in https://github.com/fusesource/mqtt-client/pull/31
Wit this fix MQTTProtocolConverter.onConnect() can now check for the condition outlined below and return a CONNACK with return code 0x02. 

>From MQTT 3.1.1 draft specification

[MQTT-3.1.3-6] A Server MAY allow a Client to supply a ClientId that has a length of zero bytes.
However if it does so the Server MUST treat this as a special case and assign a
unique ClientId to that Client. It MUST then process the CONNECT packet as if
the Client had provided that unique ClientId.
[MQTT-3.1.3-7] If the Client supplies a zero-byte ClientId, the Client MUST also set Clean
Session to 1.
[MQTT-3.1.3-8] If the Client supplies a zero-byte ClientId with Clean Session set to 0, the Server
MUST respond to the CONNECT Packet with a CONNACK return code 0x02
(Identifier rejected) and then close the Network Connection.
[MQTT-3.1.3-9] If the Server rejects the ClientId it MUST respond to the CONNECT Packet with
a CONNACK return code 0x02 (Identifier rejected) and then close the Network
Connection.



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