camera_aravis unable to read images

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Hi,

I'm using Basler aceA2040 camera. I'm able to use pylon to view the image, but when I run the node, then I get the following error.

[ INFO] [1459415796.505253469]: Attached cameras:

[ INFO] [1459415797.507343350]: # Interfaces: 2

[ INFO] [1459415797.507401522]: # Devices: 1

[ INFO] [1459415797.507439594]: Device0: Basler-21717060

[ INFO] [1459415797.508187757]: Opening: (any)

[ INFO] [1459415797.649533133]: Opened: Basler-21717060

[ INFO] [1459415797.681021939]: Set gain = 36.000000

[ INFO] [1459415797.683831732]: Camera does not support FocusPos.

[ INFO] [1459415799.696795557]:     Using Camera Configuration:

[ INFO] [1459415799.696895442]:     ---------------------------

[ INFO] [1459415799.697275209]:     Vendor name          = Basler

[ INFO] [1459415799.697664075]:     Model name           = acA2040-25gc

[ INFO] [1459415799.698057562]:     Device id            = 21717060

[ INFO] [1459415799.698113163]:     Sensor width         = 2048

[ INFO] [1459415799.698151466]:     Sensor height        = 2048

[ INFO] [1459415799.698195014]:     ROI x,y,w,h          = 0, 0, 2046, 2046

[ INFO] [1459415799.698259450]:     Pixel format         = yuv422packed

[ INFO] [1459415799.698318762]:     BytesPerPixel        = 2

[ INFO] [1459415799.698932602]:     Acquisition Mode     = Continuous

[ INFO] [1459415799.699541695]:     Trigger Mode         = Off

[ INFO] [1459415799.700273893]:     Trigger Source       = Line1

[ INFO] [1459415799.700332053]:     Can set FrameRate:     True

[ INFO] [1459415799.701400025]:     AcquisitionFrameRate = 100 hz

[ INFO] [1459415799.701450797]:     Can set Exposure:      True

[ INFO] [1459415799.701492482]:     Can set ExposureAuto:  True

[ INFO] [1459415799.701533147]:     Exposure             = 2000 us in range [24,1e+07]

[ INFO] [1459415799.701571927]:     Can set Gain:          True

[ INFO] [1459415799.701605875]:     Can set GainAuto:      True

[ INFO] [1459415799.701642581]:     Gain                 = 36.000000 % in range [36.000000,512.000000]

[ INFO] [1459415799.701679707]:     Can set FocusPos:      False

[ INFO] [1459415799.702172955]:     Network mtu          = 1500

[ INFO] [1459415799.702224649]:     ---------------------------

[ INFO] [1459415800.060123136]: using default calibration URL

[ INFO] [1459415800.060201986]: camera calibration URL: file:///home/students/.ros/camera_info/21717060.yaml

[ INFO] [1459415800.060287986]: Unable to open camera calibration file [/home/students/.ros/camera_info
/21717060.yaml]

[ WARN] [1459415800.060328945]: Camera calibration file /home/students/.ros/camera_info/21717060.yaml not found.

[ WARN] [1459415800.804103698]: Frame error: ARV_BUFFER_STATUS_TIMEOUT

I found a similar issue which suggested to generate a calibration file. I'm not sure how to do that. Could someone please suggest how to generate the correct calibration file needed by this node? ( I'm running the camera_aravis prackage).

Issue #4 Github

Thanks