[Octave-bug-tracker] [bug #55212] Unhelpful error message if COM port already open (Instrument control package)

[anonymous]

URL:
  <https://savannah.gnu.org/bugs/?55212>

                 Summary: Unhelpful error message if COM port already open
(Instrument control package)
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Wed 12 Dec 2018 01:56:10 PM UTC
                Category: Octave Forge Package
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Feature Request
                  Status: None
             Assigned to: None
         Originator Name: Arnaud Miege
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.4.1
        Operating System: Microsoft Windows

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Details:

When trying to create serial object in Octave, I got the following error
message:


>> s=serial("\\\\.\\COM15",1200)

error: serial: Error opening the interface: No such file or directory


Nothing I tried would work and I simply couldn't connect to the piece hardware
on the serial port. Until I realised that the port was actually already open
in a PuTTY window. 

It would be great if the error message was a lot more helpful, with something
like "Unable to create serial object, COM port already open." or similar. Not
sure if it's possible to detect whether a port is already open when attempting
to create the serial object.




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