ApplicationDescription – OPC Unified Architecture

A NetworkMessage with MessageType ApplicationDescription is a JSON object with the fields defined in Table 189.

All fields are encoded using CompactEncoding OPC UA JSON Data Encoding defined in OPC 10000-6 .

Table 189 – JSON ApplicationDescription definition

Name	Type	Description
MessageId	String	A globally unique identifier for the message. This value is mandatory.
MessageType	String	This value shall be “ua-application”. This value is mandatory.
PublisherId	String	The Publisher that sent the message. This value is mandatory.
Timestamp	UtcTime	When the message was first sent to the middleware. This value is mandatory.
Description	ApplicationDescription	The ApplicationDescription Structure is described in OPC 10000-4.
ServerCapabilities	String []	The set of Server capabilities supported by the Server associated with the Publisher. The set of allowed Server capabilities are defined in OPC 10000-12. This value is mandatory.