Async OPC-UA Core

Part of async-opcua, a general purpose OPC-UA library in rust.

This library contains common types used by the server and client parts of the async-opcua library.

You will typically use either the client or server, and rarely use this library directly.

async-opcua-core covers a few different areas of shared functionality.

• The RequestMessage and ResponseMessage enums, which discriminate over the possible messages in an OPC-UA request and response.
• Core message types such as HelloMessage, AcknowledgeMessage, MessageChunk, etc. and components of these.
• The low-level implementation of the opc/tcp protocol.
• The SecureChannel type, which uses async-opcua-crypto to encrypt OPC-UA messages.