OPC UA WW CS client
===================
The OPC UA source plugin will connect to one or several OPC UA servers. There
it will find all WwCS machines available. It will read and monitor the
information for WwIdentification and WwState. It will turn this informationen
into Weinig Machine Monitoring information.

Configuration
-------------
The configuration of OPC UA WW CS Client is located at the section
`[opcuawwcsclient/?]` in the `viaConnector.ini` file. `?` needs to be replaced
with a number. There can be several opcuawwcsclient sections, resulting in
several connections being established.

The client supports TCP/binary transports/encodings.

The following things can be configured (per client):
* `serverUrl`:     the URL where the OPC UA server can be found (e.g.
                   tcp.opc://10.10.12.3).
* `pkiPath`:       the directory where the client finds its key and
                   certificatematerial. If pkiPath is set for a client it will
                   try to connect to an endoint with transport security. It
                   will pick the endpoint with the highest security rating. The
                   server expects to find the following directories below the
                   `pkiPath`:
  * own/private:   must contain the private key of the server
  * own/certs:     must contain the server certificate
  * trusted/certs: trusted client certificates
  * trusted/crl:   revocation list for client certificates
  * issuers/certs:
  * issuers/crl:  
* `username`: The username required to log into the server. If no username is
              provided an "anonymous" login will be attempted.
* `password`: The password required to log into the server. If no password is
              provided an "anonymous" login will be attempted.
