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Expand Up @@ -64,7 +64,7 @@ First connect and subscribe to receive the messages sent to a QoS 1 subscription

This tutorial uses Quality of Service (QoS) level of 1 (equivalent to Solace “Guaranteed” or “Persistent” messages), which are at least once delivery messages. So first, let’s express interest in the messages by subscribing to a topic filter.

A topic filter in MQTT differs from a Solace SMF topic subscription. Users can learn more about the differences between the two in the Topic Names and Filters section of [MQTT Specification Conformance – Operational Behavior](https://docs.solace.com/MQTT-311-Prtl-Conformance-Spec/Operational_behavior.htm).
A topic filter in MQTT differs from a Solace SMF topic subscription. Users can learn more about the differences between the two in the Topic Names and Filters section of [MQTT Specification Conformance – Operational Behavior](https://docs.solace.com/API/MQTT-v50-Prtl-Conformance-Spec/mqtt-v50-4-operational-behavior.htm).

As with other tutorials, this tutorial receives messages asynchronously through callbacks. So define a callback using the 'MqttCallback' interface as outlined in the [publish/subscribe tutorial](../publish-subscribe/).

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