AWSIoTMqttHeaders

Objective-C

@interface AWSIoTMqttHeaders

Swift

class AWSIoTMqttHeaders

Specifies MQTT Version 5.0 headers information. For more information, see MQTT from Amazon Web Services IoT Core Developer Guide.

  • A UTF-8 encoded string that describes the content of the publishing message.

    For more information, see Content Type from the MQTT Version 5.0 specification.

    Supports substitution templates.

    Declaration

    Objective-C

    @property (nonatomic, strong) NSString *_Nullable contentType;

    Swift

    var contentType: String? { get set }

  • The base64-encoded binary data used by the sender of the request message to identify which request the response message is for when it’s received.

    For more information, see Correlation Data from the MQTT Version 5.0 specification.

    This binary data must be based64-encoded.

    Supports substitution templates.

    Declaration

    Objective-C

    @property (nonatomic, strong) NSString *_Nullable correlationData;

    Swift

    var correlationData: String? { get set }

  • A user-defined integer value that will persist a message at the message broker for a specified amount of time to ensure that the message will expire if it’s no longer relevant to the subscriber. The value of messageExpiry represents the number of seconds before it expires. For more information about the limits of messageExpiry, see Amazon Web Services IoT Core message broker and protocol limits and quotas from the Amazon Web Services Reference Guide.

    Supports substitution templates.

    Declaration

    Objective-C

    @property (nonatomic, strong) NSString *_Nullable messageExpiry;

    Swift

    var messageExpiry: String? { get set }

  • An Enum string value that indicates whether the payload is formatted as UTF-8.

    Valid values are UNSPECIFIED_BYTES and UTF8_DATA.

    For more information, see Payload Format Indicator from the MQTT Version 5.0 specification.

    Supports substitution templates.

    Declaration

    Objective-C

    @property (nonatomic, strong) NSString *_Nullable payloadFormatIndicator;

    Swift

    var payloadFormatIndicator: String? { get set }

  • A UTF-8 encoded string that’s used as the topic name for a response message. The response topic is used to describe the topic which the receiver should publish to as part of the request-response flow. The topic must not contain wildcard characters.

    For more information, see Response Topic from the MQTT Version 5.0 specification.

    Supports substitution templates.

    Declaration

    Objective-C

    @property (nonatomic, strong) NSString *_Nullable responseTopic;

    Swift

    var responseTopic: String? { get set }

  • An array of key-value pairs that you define in the MQTT5 header.

    Declaration

    Objective-C

    @property (nonatomic, strong) NSArray<AWSIoTUserProperty *> *_Nullable userProperties;

    Swift

    var userProperties: [AWSIoTUserProperty]? { get set }