Now you can connect to the OPC Foundation UA sample server which is hosted on our web site. An OPC UA client that connects to OPC UA server, browses items and monitors value changes. It is built with MicroClaritys OPC UA Ansi C Stack/SDK. All MicroClaritys OPC UA Stacks(Java, .NET, AnsiC) are built to be cross platform. This client uses iOSs builtin TCP/IP APIs and security APIs.