Client-side Diagnostics and Monitoring

The MTConnect OPC UA server exposes diagnostics information which can be accessed by any OPC UA Client via a specific set of data items.

1. Server State Data Item

The MTConnect-Server's CurrentState data item exposes the current state of the OPC UA Server Thread within the server service. The following list shows all possible state values:


Value	Description
0	Server Thread is stopped .
1	OPC UA Inititialization started.
2	OPC UA Node Manger started.
3	Server data items and methods created.
4	Agent folder created.
5	All agent threads started and server is running in normal operation state.
6	No agent threads started (since no agents are configured).
7	Server is restarting (due to a restart request from the configuration tool).
-1	Server is stopped since OPC UA Node Manger could not be started.
-2	Server is stopped due to a failure in the agent start sequence.

Agent State Data Item

The Agent's ConnectState data item exposes the current connection state of a specific MTConnect agent. The following list shows all possible state values:


Value	Description
0	Connection to agent not established. Occurs when the agent is not enabled.
1	The server has sent a Probe request and has received a proper Probe response.
-1	The server has sent a Probe request but the agent does not answered. This error indicates that the agent's URi is invalid or not reachable.
2	The server has sent a Current request and has received a proper Current response.
-2	The server has sent a Current request but the agent does not replied with a Current response.
3	The server has sent a *Sample* request and cyclically receives *Sample* responses. This is the expected state for a proper connection to the agent.
-3	The received Sample response contains invalid data or has an invalid structure.
-4	The server received a bad HTTP status code.
-5	An exception occurred when the server tried to send the Sample request*.
-6	A HTTP timeout occurred while the server waited for the Sample response.
-7	The Sample request has been canceled by the HTTP protocol layer.
-8	A Web exception occurred when the server tried to send the Sample request*.
-9	An Application exception occurred when the server tried to send the Sample request*.
-10	An unspecific exception occurred when the server tried to send the Sample request*.

* The log file of the OPC UA Server Service contains detailed information about the exception.