device with value o f-6

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I have connected a pisa hand to my desktop via usb and when I run

roslaunch qb_device_driver communication_handler.launch

I get the following:

connected device: 0 port: /dev/ttyUSB0 [ INFO] [1545044631.584193513]: [CommunicationHandler] has found [1] devices connected: [ INFO] [1545044631.584253849]: - device [-6] connected through [/dev/ttyUSB0]

The -6 seems seems incorrect as an id.

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