PubrelPacket (HiveMQ Extension SDK 4.28.1 API)

All Known Subinterfaces:

ModifiablePubrelPacket
```
@Immutable
@DoNotImplement
public interface PubrelPacket
```
Represents a PUBREL packet.
Contains all values of an MQTT 5 PUBREL, but will also used to represent MQTT 3 PUBREL packets.

Since:

4.3.0, CE 2020.1

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`int`	`getPacketIdentifier()`	The packet identifier of the PUBREL.
`@NotNull PubrelReasonCode`	`getReasonCode()`	The reason code from the PUBREL packet.
`@NotNull Optional<String>`	`getReasonString()`	The reason string of the PUBREL packet.
`@NotNull UserProperties`	`getUserProperties()`	The user properties from the PUBREL packet.

- Method Detail
  - getPacketIdentifier
```
int getPacketIdentifier()
```
    The packet identifier of the PUBREL.
    
    Returns:
    
    The packet identifier.
    
    Since:
    
    4.3.0, CE 2020.1
  - getReasonCode
```
@NotNull PubrelReasonCode getReasonCode()
```
    The reason code from the PUBREL packet.
    
    Returns:
    
    The pubrel reason code.
    
    Since:
    
    4.3.0, CE 2020.1
    
    See Also:
    
    How reason codes are translated from MQTT 5 to MQTT 3.
  - getReasonString
```
@NotNull Optional<String> getReasonString()
```
    The reason string of the PUBREL packet.
    For an MQTT 3 client this Optional for the MQTT 5 property will always be empty (if not modified by a previous PubrelInboundInterceptor or PubrelOutboundInterceptor).
    
    Returns:
    
    An Optional containing the pubrel reason string if present.
    
    Since:
    
    4.3.0, CE 2020.1
  - getUserProperties
```
@NotNull UserProperties getUserProperties()
```
    The user properties from the PUBREL packet.
    For an MQTT 3 client this MQTT 5 property will always be empty (if not modified by a previous PubrelInboundInterceptor or PubrelOutboundInterceptor).
    
    Returns:
    
    The user properties.
    
    Since:
    
    4.3.0, CE 2020.1