0) what happens when you run when the reset is commented out?

1) do you have some other software running that is claiming the station?  
what does 'ps aux' tell you?

2) are you running weewx as root?

3) is the log from running weewx directly or as a daemon?

4) is the log you posted with the reset or without the reset in 
(it looks like it is with reset)

5) please post the following info: os, udev, libusb, pyusb

*uname -a*Linux feta 4.1.19-v7+ #858 SMP Tue Mar 15 15:56:00 GMT 2016 
armv7l GNU/Linux

*cat /etc/issue*Raspbian GNU/Linux 7

*dpkg -l | grep udev*ii  libgudev-1.0-0:armhf  175-7.2 armhf  GObject-based 
wrapper library for libudev
ii  libudev0:armhf        175-7.2 armhf  libudev shared library
ii  udev                  175-7.2 armhf  /dev/ and hotplug management daemon

*dpkg -l | grep libusb*ii  libusb-0.1-4:armhf    2:0.1.12-20+nmu1  armhf  
userspace USB programming library
ii  libusb-1.0-0:armhf    2:1.0.11-1        armhf  userspace USB 
programming library

*dpkg -l | grep python-usb*ii  python-usb           0.4.3-1            
armhf  USB interface for Python

try forcing the kernel to release the station:

option 1: unload the hid kernel module.  *warning!*  this will make any 
mouse, keyboard, or other usb hid device stop functioning!

  sudo rmmod usbhid

option 2: try to get usbhid to release just the station

  sudo bash -c "echo -n XXX > /sys/bus/usb/drivers/usbhid/unbind"

where XXX is something like 2-1:1.0 - it is the usb device number for your 
station.  you can see them all at /sys/bus/usb/devices.  the easiest way to 
figure out the number for your station is to

  ls /sys/bus/usb/devices 

before your station is plugged in, then again after you plug in the 

after you do either option 1 or option 2, start weewx and see if you still 
get the 'device or resource busy' failure.

the 'device or resource busy' message typically indicates one of these 

a) there is another process running that has claimed the usb device, e.g., 
another instance of weewx or some modem software
b) the kernel has claimed the device, typically via usbhid, and the calls 
to release it in the driver code are not working
c) the user running weewx does not have permission to claim the usb device 
(more often this is 'permission denied')
d) the usb reset is invoked in the driver after claiming the interface, 
which causes the driver to release its claim of the interface


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