[juneau-lug] losing permissions

  • From: Jamie <jamie@xxxxxxxxxxxxxxxxx>
  • To: juneau-lug@xxxxxxxxxxxxx
  • Date: Thu, 27 Feb 2014 11:28:07 -0900

Kevin may be interested to know that his old Shuttle is still in running 
and providing support for my remote weather station.  This La Crosse 
2316 weather station connects via ttyUSB0.

The problem: for unknown reasons the device periodically disconnects 
(see log below) and when it re-connects it has lost its elevated 
permissions and fails to upload the data.  It did it again today.  I 
logged in and did a "sudo chmod 766 /dev/ttyUSB0 " & it's back up and 
working.  It just started doing this a month or so ago and this is the 
third time.

1) Why is it doing this?

2) How do I prevent it?

My previous attempt at creating a udev rule to set permissions was 
unsuccessful.  It has always lost elevated permissions when re-booting.  
In my latest attempt just now I added the line:
KERNEL="ttyUSB[0-9]*", GROUP="dialout", MODE="0766", ENV{GENERATED}="1"
to the file:
/etc/udev/rules.d/91-persistent-weather-usb.rules

Does this seem right?  Thanks for any help.
-Jamie

Log:
Feb 27 08:44:13 Hig01 kernel: [1448796.824052] hub 2-0:1.0: port 1 
disabled by hub (EMI?), re-enabling...
Feb 27 08:44:13 Hig01 kernel: [1448796.824137] usb 2-1: USB disconnect, 
device number 4
Feb 27 08:44:13 Hig01 kernel: [1448796.824367] ftdi_sio ttyUSB0: FTDI 
USB Serial Device converter now disconnected from ttyUSB0
Feb 27 08:44:13 Hig01 kernel: [1448796.824395] ftdi_sio 2-1:1.0: device 
disconnected
Feb 27 08:44:13 Hig01 kernel: [1448797.064021] usb 2-1: new full-speed 
USB device number 5 using uhci_hcd
Feb 27 08:44:13 Hig01 kernel: [1448797.242074] usb 2-1: New USB device 
found, idVendor=0403, idProduct=6001
Feb 27 08:44:13 Hig01 kernel: [1448797.242082] usb 2-1: New USB device 
strings: Mfr=1, Product=2, SerialNumber=0
Feb 27 08:44:13 Hig01 kernel: [1448797.242088] usb 2-1: Product: USB <-> 
Serial
Feb 27 08:44:13 Hig01 kernel: [1448797.242092] usb 2-1: Manufacturer: FTDI
Feb 27 08:44:13 Hig01 kernel: [1448797.248147] ftdi_sio 2-1:1.0: FTDI 
USB Serial Device converter detected
Feb 27 08:44:13 Hig01 kernel: [1448797.248199] usb 2-1: Detected FT232BM
Feb 27 08:44:13 Hig01 kernel: [1448797.248204] usb 2-1: Number of 
endpoints 2
Feb 27 08:44:13 Hig01 kernel: [1448797.248208] usb 2-1: Endpoint 1 
MaxPacketSize 64
Feb 27 08:44:13 Hig01 kernel: [1448797.248212] usb 2-1: Endpoint 2 
MaxPacketSize 64
Feb 27 08:44:13 Hig01 kernel: [1448797.248216] usb 2-1: Setting 
MaxPacketSize 64
Feb 27 08:44:13 Hig01 kernel: [1448797.250205] usb 2-1: FTDI USB Serial 
Device converter now attached to ttyUSB0
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