Re: pyepics "Virtual circuit disconnect" CA.Client.Exception

[Matt Newville <newville@cars.uchicago.edu>]

Hi Walter,

Sorry for the delay in responding, and thanks Andrew.    To be clear, a pyepics.PV *does* automatically create a simple connection callback,  and PVs should definitely re-connect on re-boot of an IOC (they do for me!).

As Andrew suggests, using epics.ca.replace_printf_handler() is probably what you want for redirecting or suppressing the messages sent from the CA library.  For example,

    import epics

    def handle_messages(text):

        print(" Saw CA Message: %s\n" % text)

    epics.ca.replace_printf_handler(handle_messages)

By default, such messages are sent to STDERR.   As an alternative, you could redirect all messages to STDERR, by replacing sys.stderr.write with your own function.  That wouldn't be CA-specifc, of course.

Hope that helps,

--Matt