Table of Contents
Advertisement
Troubleshooting
N O TE
Keysight N437x Series Lightwave Component Analyzer, Programmer's Guide
During application development you may encounter situations
where the Open() call fails.
This happens when a session on the LCA is already open.
If there are no other applications using the LCA, the most likely
reason is that an application finished without closing its
session, for example when running an application in the
debugger and you terminate it by stopping the debugger.
The LCA and the LCA Remote Client have a heartbeat
mechanism to detect abandoned sessions. The LCA checks for
60 seconds of inactivity. If nothing happens in this time, the
LCA assumes the session has been abandoned and it closes this
session, so that other clients are able to open a session.
You may want to workaround this behavior during application
development. There are two cases here.
• If your client application halts on a breakpoint, the heartbeat
is suspended, so if your application is suspended for more
than 60 seconds, the server closes the session. When you try
to continue execution, you get an error telling you that no
session is open.
To keep sessions open, start the LCA server on the network
analyzer with the command-line parameter
"NOAUTOCLOSE".
• If you are running into problems restarting your application
because aborted sessions are still open, call CloseAll() before
the Open() call.
We recommend you only use these workarounds during development.
Only use CloseAll() in environments where you are sure no other client
could have a session opened. CloseAll() will close sessions from all the
LCA clients.
Remote Operation
23
Advertisement
Table of Contents
