# Coding question for trecking device
**URL:** https://discourse.processing.org/t/coding-question-for-trecking-device/20385
**Category:** Electronics (Arduino, etc.)
**Created:** [May 2, 2020, 11:38am UTC](https://discourse.processing.org/t/coding-question-for-trecking-device/20385 "2020-05-02T11:38:05Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@kanktonk](https://discourse.processing.org/u/kanktonk)
#### Post date: [May 2, 2020, 11:38am UTC](https://discourse.processing.org/t/coding-question-for-trecking-device/20385/1 "2020-05-02T11:38:05Z")
Hey I try to use processing together with my old lego mindstorm roboter.
I spend a lot of time to research how to combine them and finally found a code online which looked helpfull. But now i get this ERROR can somebody please help me to fix this problem:
> jssc.SerialPortException: Port name - /dev/tty.NXT-DevB; Method name - openPort(); Exception type - Port busy.
> at jssc.SerialPort.openPort(SerialPort.java:164)
> at pt.citar.diablu.nxt.protocol.NXTCommBluetoothSerialChannelJSSC.openPort(Unknown Source)
> at pt.citar.diablu.nxt.protocol.NXTCommBluetoothSerialChannelJSSC.(Unknown Source)
> at pt.citar.diablu.processing.nxt.LegoNXT.(Unknown Source)
> at sketch\_200502a.setup(sketch\_200502a.java:64)
> at processing.core.PApplet.handleDraw(PApplet.java:2432)
> Port name - /dev/tty.NXT-DevB; Method name - openPort(); Exception type - Port busy.
> at processing.awt.PSurfaceAWT$12.callDraw(PSurfaceAWT.java:1547)
> at processing.core.PSurfaceNone$AnimationThread.run(PSurfaceNone.java:313)
> RuntimeException: jssc.SerialPortException: Port name - /dev/tty.NXT-DevB; Method name - openPort(); Exception type - Port busy.
> RuntimeException: jssc.SerialPortException: Port name - /dev/tty.NXT-DevB; Method name - openPort(); Exception type - Port busy.
> RuntimeException: jssc.SerialPortException: Port name - /dev/tty.NXT-DevB; Method name - openPort(); Exception type - Port busy.
> RuntimeException: jssc.SerialPortException: Port name - /dev/tty.NXT-DevB; Method name - openPort(); Exception type - Port busy.
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### Author:  [@jeremydouglass](https://discourse.processing.org/u/jeremydouglass)
#### Post date: [May 8, 2020, 7:01pm UTC](https://discourse.processing.org/t/coding-question-for-trecking-device/20385/2 "2020-05-08T19:01:31Z")
A post was merged into an existing topic: [Connecting Mindstorm Lego roboter](https://discourse.processing.org/t/connecting-mindstorm-lego-roboter/20354)
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### Author:  [@jeremydouglass](https://discourse.processing.org/u/jeremydouglass)
#### Post date: [May 8, 2020, 7:01pm UTC](https://discourse.processing.org/t/coding-question-for-trecking-device/20385/3 "2020-05-08T19:01:31Z")