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Module name inaccessible on Linux

Issue:

./getrelay
path:             /dev/hidraw4
vendor_id:        0x16c0
product_id:       0x05df
serial_number:
release_number:   256
manufacturer:     www.dcttech.com
product:          USBRelay2
interface_number: 0
module_name:      < ERROR: Inaccessible! >

Fix:

Check file permissions of your device:

ls -l /dev/hidraw4
crw------- 1 root root 508, 4 sep 15 15:18 /dev/hidraw4

For quick fix solution sudo can be used:

sudo ./getrelay

Or configure udev rules:

  1. Create udev rules file, e.g.:
sudo touch /etc/udev/rules.d/91-usbrelay.rules
  1. Add rule:
SUBSYSTEM=="hidraw", ATTRS{idVendor}=="16c0", ATTRS{idProduct}=="05df", MODE="0666", GROUP="plugdev"
  1. Check if your user in plugdev group:
groups
adm dialout cdrom sudo dip plugdev docker
  1. If no, add:
sudo usermod -aG plugdev $LOGNAME
  1. Apply new rules:
sudo udevadm control --reload-rules
  1. Unplug/plug USB relay module.

In the examples folder you can find an example of udev rules file 91-usbrelay.rules.

Corrupted module name

Issue:

The module name is corrupted and cannot be used for renaming.

Fix:

Leave only this module connected and use an empty name for renaming, for example:

./setrelay =R8

In this example, the first detetected module (in our case, only the one with the corrupted name) is renamed to "R8".

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