WebSphere Message Brokers
File: ac11480_
Writer: Kate Hostler

Reference topic

This build: July 31, 2007 21:18:14

WebSphere MQ Telemetry Transport payload

The following types of WebSphere MQ Telemetry Transport command message have a payload in the message header:

CONNECT
The payload contains one or three UTF-8 encoded strings. The first string uniquely identifies the client to the broker. The second string is the Will topic, and the third string is the Will message. The second and third strings are present only if the Will flag is set in the CONNECT Flags byte.
SUBSCRIBE
The payload contains a list of topic names to which the client can subscribe, and the QoS level. These strings are UTF-encoded.
SUBACK
The payload contains a list of granted QoS levels. These are the QoS levels at which the administrators for the broker have permitted the client to subscribe to a particular Topic Name. Granted QoS levels are listed in the same order as the topic names in the corresponding SUBSCRIBE message.

The payload part of a PUBLISH message contains application-specific data only. No assumptions are made about the nature or content of the data, and this part of the message is treated as a BLOB.

If you want an application to apply compression to the payload data, you need to define in the application the appropriate payload flag fields to handle the compression details. You cannot define application-specific flags in the fixed or variable headers.

Related concepts
WebSphere MQ Telemetry Transport
Related reference
CONNECT Client requests a connection to a broker
SUBSCRIBE Subscribe to named topics
SUBACK Subscription acknowledgment
PUBLISH Publish message
WebSphere MQ Telemetry Transport fixed header
WebSphere MQ Telemetry Transport variable header
WebSphere MQ Telemetry Transport Quality of Service levels and flows
WebSphere MQ Telemetry Transport and UTF-8
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This build: July 31, 2007 21:18:14

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