Failed to open /dev/ttyUSB0 Permission denied

[Leo Neumeyer]

Hi Guys,

Trying OLA for the first time, great project. I'm sure this is a silly problem but couldn't find any info. I'm getting  this error: Failed to open /dev/ttyUSB0 Permission denied Changing permissions in the device didn't make a difference. I can access the web UI.

Thanks!

arch linux

OLA Daemon version 0.8.31

UltraDMX Micro

Log:

$ olad -l 3

Olad.cpp:86: OLA Daemon version 0.8.31

OlaDaemon.cpp:103: Using configs in /home/leo/.ola

OlaServer.cpp:466: Updated PID definitions.

OlaServer.cpp:199: Server UID is 7a70:fa01000a

HTTPServer.cpp:458: HTTP Server started on port 9090

PluginManager.cpp:108: Trying to start ArtNet

DeviceManager.cpp:111: Installed device: ArtNet [10.0.1.250]:2-1

PortManager.cpp:151: Patched 2-1-O-0 to universe 1

PluginManager.cpp:112: Started ArtNet

PluginManager.cpp:108: Trying to start Dummy

DeviceManager.cpp:111: Installed device: Dummy Device:1-1

PluginManager.cpp:112: Started Dummy

PluginManager.cpp:108: Trying to start E1.31 (sACN)

DeviceManager.cpp:111: Installed device: E1.31 (DMX over ACN) [10.0.1.250]:11-1

PluginManager.cpp:112: Started E1.31 (sACN)

PluginManager.cpp:108: Trying to start ESP Net

DeviceManager.cpp:111: Installed device: ESP Net [10.0.1.250]:4-1

PluginManager.cpp:112: Started ESP Net

PluginManager.cpp:108: Trying to start KarateLight

KaratePlugin.cpp:77: Could not open /dev/kldmx0 No such file or directory

PluginManager.cpp:112: Started KarateLight

PluginManager.cpp:108: Trying to start KiNET

NetworkUtils.cpp:64: Could not convert address 

KiNetPlugin.cpp:59: Invalid power supply IP address : 

DeviceManager.cpp:111: Installed device: KiNet Device:16-1

PluginManager.cpp:112: Started KiNET

PluginManager.cpp:108: Trying to start Milford Instruments

PluginManager.cpp:112: Started Milford Instruments

PluginManager.cpp:108: Trying to start Enttec Open DMX

OpenDmxPlugin.cpp:78: Could not open /dev/dmx0 No such file or directory

PluginManager.cpp:112: Started Enttec Open DMX

PluginManager.cpp:108: Trying to start SandNet

DeviceManager.cpp:111: Installed device: SandNet [10.0.1.250]:7-1

PluginManager.cpp:112: Started SandNet

PluginManager.cpp:108: Trying to start ShowNet

DeviceManager.cpp:111: Installed device: ShowNet [10.0.1.250]:3-1

PluginManager.cpp:112: Started ShowNet

PluginManager.cpp:108: Trying to start SPI

PluginManager.cpp:112: Started SPI

PluginManager.cpp:108: Trying to start StageProfi

StageProfiDevice.cpp:76: StageProfiPlugin: failed to connect to /dev/ttyUSB0

PluginManager.cpp:112: Started StageProfi

PluginManager.cpp:108: Trying to start Serial USB

WidgetDetectorThread.cpp:200: Found potential USB Serial device at /dev/ttyUSB0

BaseUsbProWidget.cpp:127: Failed to open /dev/ttyUSB0 Permission denied

WidgetDetectorThread.cpp:200: Found potential USB Serial device at /dev/ttyUSB0

BaseUsbProWidget.cpp:127: Failed to open /dev/ttyUSB0 Permission denied

PluginManager.cpp:112: Started Serial USB

PluginManager.cpp:108: Trying to start USB

PluginManager.cpp:112: Started USB

PluginManager.cpp:108: Trying to start Pathport

DeviceManager.cpp:111: Installed device: Pathport [10.0.1.250]:9-1

PluginManager.cpp:112: Started Pathport

ArtNetNode.cpp:1775: Artnet RDM discovery complete

WidgetDetectorThread.cpp:200: Found potential USB Serial device at /dev/ttyUSB0

BaseUsbProWidget.cpp:127: Failed to open /dev/ttyUSB0 Permission denied

WidgetDetectorThread.cpp:200: Found potential USB Serial device at /dev/ttyUSB0

BaseUsbProWidget.cpp:127: Failed to open /dev/ttyUSB0 Permission denied

[Simon Newton]

What user are you running as, and what does ls -l /dev/ttyUSB0 show ?

Simon

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[Leo Neumeyer]

I found the problem. Read permission for all users was missing. What's the best way to configure the permissions?

thanks!

[Simon Newton]

What group owns the device? Normally it's dialout or plugdev. Add the
user to that group.

Simon

[Leo Neumeyer]

The device is owned by group uucp. Added user to group, rebooted and now it works. Thanks!