Remote access for processor temperature

Configuration
1

Hello;
My Home assistant is on a RPi under Debian.
I want to supervise several remote RPi temperature
I have followed instructions: file command_line.yaml with instructions:

# Temperature CPU RPI4
- sensor:
    name: RPi4 CPU Temperature
    unique_id: RPi4_CPU_Temperature
    command: "cat /sys/class/thermal/thermal_zone0/temp"
    value_template: "{{ value | multiply(0.001) | round(0) }}"
    unit_of_measurement: c°
    scan_interval: 60
# Temperature CPU RPI5
- sensor:
    name: RPi5 CPU Temperature
    unique_id: RPi5_CPU_Temperature
    command: "ssh [email protected] cat /sys/class/thermal/thermal_zone0/temp"
    value_template: "{{ value | multiply(0.001) | round(0) }}"
    unit_of_measurement: c°
    scan_interval: 60
# Temperature CPU RPI0
- sensor:
    name: RPi0 CPU Temperature
    unique_id: RPi0_CPU_Temperature
    command: "ssh [email protected] cat /sys/class/thermal/thermal_zone0/temp"
    value_template: "{{ value | multiply(0.001) | round(0) }}"
    unit_of_measurement: c°
    scan_interval: 60

For the local Rpi (PI4) no problem.
But for remote, no success: the device is “unknown”.
On terminal with ‘pi’ user the instruction is success; I have generated a ssh-keygen and copied on remote RPi. The command don’t need user or password.
My questions:

  • Have I done mistake ?
  • On home assistant, which user is used to launch terminal command ?
  • Any idea ?
    Thanks
2

do you have the following in configuration.yaml

command_line: !include command_line.yaml

Also, change

unit_of_measurement: c°

to

unit_of_measurement: °C
3

Hello
For the configuration.yaml file, I had the correct line; to no avail. And my Rpi4 returned the correct values.
I also changed the unit; to no avail.
I repeat, the local “cat” command returns the correct value, but the “ssh…” command returns an “unknown” value.
Thank you.

4

Sorry I missed that in your original post.

The unit_of_measurement is mostly a cosmetic change as it shouldn’t have made a difference - just formatting in a '‘standard’ way.

I believe the issue is the fact that you are using SSH and hence need to check that the ‘HA Server user’ has passwordless access.

Execute SSH command remotely - Configuration - Home Assistant Community

5

In the terminal, it’s a different docker image to the docker image that Home Assistant is running in. This is quite a common mistake.

You need to move your rsa keys (.ssh folder) to the config folder so that it can be accessed outside the docker image the terminal runs in.

6

Excuse me.
You have the right diagnostic and SJ20035 have the right commands via this link
As I was suspecting, the ssh command in command_line.yaml is not executed in my standard environment assigned to pi user (Home Assistant is installed in a docker under Debian).
The link in reference is perfect; the only line to add is to create a .ssh folder in the config directory if it doesn’t exist.

Thank too both.
The result

command_line
command_line461×298 20.2 KB

7

Glad it is sorted.

If you want to do more monitoring, then you could always put Glances on the Pi’s and use the Glances integration:

Setting up a System Monitor on the Raspberry Pi using Glances - Pi My Life Up

Glances - Home Assistant

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