AttachmentMessageRequest  
    data class AttachmentMessageRequest(    val messageId: String,     val dialogRequestId: String,     val context: String,     val namespace: String,     val name: String,     val version: String,     val referrerDialogRequestId: String,     val seq: Int,     val isEnd: Boolean,     val parentMessageId: String,     val mediaType: String,     val byteArray: ByteArray?) : MessageRequest
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Class for requesting a attachment message
Parameters
dialogRequestId  
the id for request that generated by client.
messageId 
the unique id for the message
context
the context for the message
name
the name of directive
namespace
the namespace of directive
version
the version
seq
the sequence
isEnd 
end of message
parentMessageId  
the parent message id
mediaType 
the media type
byteArray 
the byteArray is data