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# 9. Subscriber Block

The Subscriber block represents a DDS subscriber entity.

In DDS, a subscriber is “an object responsible for receiving published data and making it available to the receiving application. It may receive and dispatch data of different specified types.”

This block is optional on a DDS Simulink model diagram. If it is not present on a model diagram, each reader will create its own default subscriber.

Port Type | Optional | Name | Description | Output consumed by
--- | --- | --- | --- | ---
Input | yes | pp | DDS Domain Participant entity instance |
Output | no | psub | DDS Subscriber entity instance | Reader

## 9.1. Subscriber Block Parameters

### 9.1.1. Ports Tab

The Ports tab allows the user to toggle on or off optional ports.

### 9.1.2. QoS Tab

The QoS tab is used to set the QoS profile. By default, the OSPL default profile is used.

In DDS - The Data-Distribution Service (DDS) relies on the usage of QoS. A QoS (Quality of Service) is a set of characteristics that controls some aspect of the behavior of the DDS Service.

Each DDS block has an associated QoS profile. By default, the OSPL default profile is used. An XML file that specifies QoS profiles can be used to set the QoS of a DDS block.

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