Permissions for nonroot - usb.core

[tkelemen]

Thanks for the awesome work on this project.

I had a quick question about permissions for the usb.core package. The examples work when I used sudo, but I cannot figure out where to update the permissions to add other users/usergroups.

Thanks!

$ python3 heart_rate_monitor.py Driver available: [<class 'ant.base.driver.SerialDriver'>, <class 'ant.base.driver.USB2Driver'>, <class 'ant.base.driver.USB3Driver'>]

• Using: <class 'ant.base.driver.USB3Driver'> Traceback (most recent call last): File "heart_rate_monitor.py", line 69, in main() File "heart_rate_monitor.py", line 49, in main node = Node() File "/usr/local/lib/python3.8/dist-packages/ant/easy/node.py", line 56, in init self.ant = Ant() File "/usr/local/lib/python3.8/dist-packages/ant/base/ant.py", line 68, in init self._driver.open() File "/usr/local/lib/python3.8/dist-packages/ant/base/driver.py", line 175, in open if dev.is_kernel_driver_active(0): File "/home/ubuntu/.local/lib/python3.8/site-packages/usb/core.py", line 1061, in is_kernel_driver_active self._ctx.managed_open() File "/home/ubuntu/.local/lib/python3.8/site-packages/usb/core.py", line 102, in wrapper return f(self, *args, **kwargs) File "/home/ubuntu/.local/lib/python3.8/site-packages/usb/core.py", line 120, in managed_open self.handle = self.backend.open_device(self.dev) File "/home/ubuntu/.local/lib/python3.8/site-packages/usb/backend/libusb1.py", line 786, in open_device return _DeviceHandle(dev) File "/home/ubuntu/.local/lib/python3.8/site-packages/usb/backend/libusb1.py", line 643, in init _check(_lib.libusb_open(self.devid, byref(self.handle))) File "/home/ubuntu/.local/lib/python3.8/site-packages/usb/backend/libusb1.py", line 595, in _check raise USBError(_strerror(ret), ret, _libusb_errno[ret]) usb.core.USBError: [Errno 13] Access denied (insufficient permissions)

[Tigge]

Thank you. The setup.py tries to install udev rules to make the ANT devices available to all users. These can also be manually installed by running sudo python setup.py udev_rules or manually copying the file in resources/ to your udev folder (usually /etc/udev/rules.d I think, but can depend on what system you are using).