Regular user access to local:

Are you trying to capture the samples directly on pluto? Or on local PC?
I would log in directly as root or sudo su, if you are capturing directly on pluto.

Andrei

It is directly on pluto...context local: need sudo, I wonder why ?

Local accesses /sys/bus directly which will be require root access. Other backends go through IIOD which runs as root.

# ls -l /sys/bus/iio/
total 0
drwxr-xr-x    2 root     root             0 Jan  1 00:00 devices
drwxr-xr-x    2 root     root             0 Jan  1 00:01 drivers
-rw-r--r--    1 root     root          4096 Jan  1 00:01 drivers_autoprobe
--w-------    1 root     root          4096 Jan  1 00:01 drivers_probe
--w-------    1 root     root          4096 Jan  1 00:01 uevent

# ps aux | grep iiod
  180 root     /usr/sbin/iiod -D -n 3 -F /dev/iio_ffs
  684 root     grep iiod

-Travis

Do you think that chown analog(user) on /sys/bus/iio could solve this issue ?

That should work.

I'm alittle confused here though. PlutoSDR doesn't run Kuiper, it runs buildroot. Is this an ADALM-PLUTO?

There is also no user 'analog' on PlutoSDR's buildroot userspace.

-Travis

This is not a buildroot buils but a fork of kuiper...thus debian based with user account like analog. Everything is working until this local context which surely has never been tested on plutosdr arm itself. 

Doing a sudo chown analog -R /sys/bus/iio is not resolving the issue.

Need maybe to give you a reference to firmware which could be loaded by usb stick? 

Sorry but we don't test custom firmware.

Access to /sys for normal users isn't specific to Kuiper so I'm sure someone has a recipe or udev rule you could find.

-Travis

 I understand you don't have to test custom firmware, but give me clue to know why uri local; (compared to network uri) need special right could be helpfull.

travisfcollins said:

Local accesses /sys/bus directly which will be require root access. Other backends go through IIOD which runs as root.

"Local accesses /sys/bus directly which will be require root access"  : the main question is WHY ! Maybe use a mmap /dev/mem reserved for root ? If so, why iiod running as root could not handle this user request ?