My coordinator is a Sonoff Zigbee 3.0 USB Dongle Plus. You may find something like: export APACHE_RUN_USER=www-dataĬ) Add the User www-data to the dialout group: sudo usermod -a -G dialout www-dataĪs the Apache user has been added to the dialout group, the script should now be able to access the device.Fresh install of Zigbee2MQTT according to these instructions: You may find something like: # These need to be set in /etc/apache2/envvarsī) Quit vim and search for APACHE_RUN_USER in /etc/apache2/envvars (if the above scenario applies): # open file in editor The third option, which is the option I implemented, adds the Apache user to the dialout group so that if the script is being run by Apache, then it can access the device.Ī) Find the location of your Apache config file, then search for the User setting within that file: # open file in editor This also sets permissions for world to read and write, which you may not want to do.įor more information about this approach, see these answers:Ġ3. Create a rule in /etc/udev/rules.d that will set the permissions of the device (a restart will be required): # navigate to rules.d directory Alter the permissions on /dev/ttyACM0 so that world has read and write priviliges (something you may not want to do) - although you may find they reset each time the device is plugged in eg: sudo chmod 666 /dev/ttyACM0Ġ2.
I'm not an expert in the area, so please just use this information to support your own research.Ġ1. The following fleshes out some of the ideas in the first answer (I tried to add this content to that answer and accept it, but the edits were rejected). The Arduino IDE serial monitor shouldn't need to be open.Permissions are reset each time the USB is connected.However these conditions are not sustainable as: Arduino IDE serial monitor needs to be open. Permissions for world must be set to rw ie: sudo chmod 666 /dev/ttyACM0Ġ2. I can force it to work under the following conditions:Ġ1. cdc_acm 3-2:1.0: ttyACM0: USB ACM device Serial Ports Available $ dmesg | grep tty Mygroupname adm dialout cdrom sudo dip plugdev lpadmin sambashareĭue to various suggestions on the internet I also added the owner to the tty group via System Settings > Users and Groups. Groups the owner is a member of: $ groups rwxr-xr-x 1 myname mygroupname 114146 Jan 9 19:16 my_application.pyĬrw-rw- 1 root dialout 166, 0 Jan 9 20:12 /dev/ttyACM0 OSError: Permission denied: '/dev/ttyACM0' Ser.write(struct.pack('>3B', red_value, green_value, blue_value))Įrror Message $ sudo tail -100 /var/log/apache2/error.log It doesn't work when using the same code in a Python file ie: import serial It works when doing the following from terminal: $ python I'm trying to send three values from a Python application to Arduino.
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