OPC UA is an industrial communication protocol for industrial use. It is designed as as successor to the OPC protocol. The OPC UA Test suite specifically tests the OPC UA Binary TCP protocol.
Part 1 - Overview and Concepts
Part 2 - Security Model
Part 3 - Address Space Model
Part 4 - Services
Part 5 - Information Model
Part 6 - Mappings
Part 7 - Profiles
Part 8 - Data Access
Part 9 - Alarms and Conditions
Part 11 - Historical Access
Part 12 - Discovery and Global Services