Yarp: GrabberDual device doesn't work

[valegagge]

Describe the bug
On purple iCub I tried to grab images from RGB camera (Leopard), but I get following error:

[WARNING]ServerGrabber: period parameter not found, using default of 0.03 s 
yarp: Port /icub/cam/rpc active at tcp://10.0.0.2:10003/
yarp: Port /icub/cam/left active at tcp://10.0.0.2:10004/
yarp: Port /icub/cam/right active at tcp://10.0.0.2:10005/
[WARNING]ServerGrabber: period parameter not found, using default of 0.03 s 
yarp: Port /icub/cam/rpc failed to activate at tcp://10.0.0.2:10003/ (address conflict)
[ERROR]ServerGrabber: unable to open rpc Port /icub/cam/rpc 
yarp: Port /icub/cam/left failed to activate at tcp://10.0.0.2:10004/ (address conflict)
[ERROR]ServerGrabber: unable to open image streaming Port /icub/cam/left 
yarp: Port /icub/cam/right failed to activate at tcp://10.0.0.2:10005/ (address conflict)
[ERROR]ServerGrabber: unable to open image streaming Port /icub/cam/right 
[ERROR]ServerGrabber: Error initializing YARP ports 
yarpdev: ***ERROR*** driver <grabberDual> was found but could not open
[ERROR]opening  subdevice... FAILED
[ERROR]ServerGrabber: error while opening subdevice
yarpdev: ***ERROR*** driver <grabberDual> was found but could not open
[ERROR]yarpdev: ***ERROR*** device not available.
[INFO]Suggestions:
[INFO]+ Do "yarpdev --list" to see list of supported devices.
[INFO]+ Or append "--verbose" option to get more information.

To Reproduce
In a clean setup (no yarp application is running)

1. launch yarprobotinterface
2. launch yarpdev --from camera/ServerGrabberDualLeopard.ini (obviously on icub-head)

Expected behavior
Obviously I expect to grab images. Moreover the above command is used in some application of icub.

Additional context
I briefly tried to get into the issue and it seems to me that that the open function of the device is call more than one time. In fact, the address conflict indicates that the the device is already opened like the reported log indicates.
I managed to grab image only using usb camera device directly, instead of grabberdual device and usbcamera like subdevice.

[Nicogene]

It is an bug that I saw some time ago, I hoped that it fixed by itself :sweat_smile:

I'll look into it :eyes:

[Nicogene]

Fixed by https://github.com/robotology/yarp/commit/a33127dc8a0ff4478b2e97145d3c59e671f70ccb

[PeterBowman]

"Fixed in: YARP yarp-3.3" label -> fixed in YARP master (3.4) instead?

[Nicogene]

"Fixed in: YARP yarp-3.3" label -> fixed in YARP master (3.4) instead?

It should be ok yarp-3.3, when 3.3.1 will be released it will become Fixed in : YARP v3.3.1

[PeterBowman]

My bad, I thought commit https://github.com/robotology/yarp/commit/a33127dc8a0ff4478b2e97145d3c59e671f70ccb was not available on the yarp-3.3 branch, just master (see reference to branch below the commit title and description). Sorry!