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Parameter Name	Description	Required	Possible Values
`mqtt.server.host.name`	The name of the host.	Yes	A valid host name
`mqtt.server.port`	The port ID.	Yes	`1883`,`1885`
`mqtt.client.id`	The client ID.	Yes	A valid client ID
`mqtt.topic.name`	The name of the topic	Yes	A valid topic name
`mqtt.subscription.qos`	The QoS value.	No	`0`,`1`,`2`
`mqtt.session.clean`	Whether session clean should be enabled or not.	No	`true`, `false`
`mqtt.ssl.enable`	Whether ssl should be enabled or not.	No	`true` , `false`
`mqtt.subscription.username`	The username for the subscription.	No	A valid user name
`mqtt.subscription.password`	The password for the subscription.	No	A valid password
`mqtt.temporary.store.directory`	The path of the directory to be used as the persistent data store for quality of service purposes.	No	A valid local path. The default value is the ESB temp path.
`mqtt.blocking.sender`	Whether blocking sender should be enabled or not.	No	`true` , `false`
`mqtt.content.type`	The content type.	No	A valid content type. the default content type is `text/plain`.
`mqtt.message.retained`	Whether the message should be retained or not. This parameter can be used only in the transport sender.	No	`true`, `false` The default value is `false`.

For a sample that demonstrates how Axis2 publishes a message on a particular topic, and how an MQTT client subscribed to that topic receives it, see Sample 272:Publishing and Subscribing using WSO2 ESB's MQ Telemetry Transport.

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