Python for Jetson nano

Get the followings when running the first frame program 

system.initialize() Status.Ok
system.getCameraList() Status.Ok
system.getAvailableModes() Status.Ok
['near', 'medium', 'far', 'custom']
system.getAvailableFrameTypes() Status.Ok
['depth_ir', 'depth_only', 'ir_only', 'raw']
camera1.initialize() Status.Ok
system.getDetails() Status.Ok
camera1 details: id: connection: ConnectionType.???
camera1.setFrameType() Status.Ok
raw
camera1.setMode() Status.Ok
camera1.requestFrame() Status.Ok
frame.getDetails() Status.Ok
frame details: width: 640 height: 960 type: depth_only
[[800 0 0 ..., 800 800 800]
[800 800 800 ..., 800 800 800]
[ 0 800 800 ..., 800 800 800]
...,
[ 0 0 0 ..., 0 0 0]
[ 0 0 0 ..., 0 0 0]
[ 0 0 0 ..., 0 0 0]]

The connection type is unknown? 

Sometimes it only shows 0s only

Please help