Temperature from another pi via ssh

Configuration
1

Hello
i want to get the temperature from another pi. I found some information and a thread from 2017 https://community.home-assistant.io/t/read-data-from-another-pi/30655/2
I have installed the SSH Server addon and configured the ssh-key.
In the configuration i wrote

sensor pi_hole:
  - platform: command_line
    name: Pi-Hole Temperatur
    command: "ssh [email protected] echo $((`cat /sys/class/thermal/thermal_zone0/temp|cut -c1-2`)).$((`cat /sys/class/thermal/thermal_zone0/temp|cut -c3-4`))"
    unit_of_measurement: "°C"

But the temperature would not show.
If i type it in the terminal window they show me the temperature without asking the password.
Can anyone help me?

2

What’s in the logs?

Probably need to disable pseudo tty allocation

command: "ssh -T [email protected] ..."

3

How are you running Home Assistant? Docker, venv etc?

If you are running in a venv, did you activate the venv before configuring the ssh-keys?

4

If you’re running ssh from Hassio, then take a look at this:

There’s just a few steps to get ssh running smoothly in that context.

5

hi, i check it like that:

  - platform: command_line
    name: rpi3_cputemp_ssh
    command: "ssh -q -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no  [email protected] -i /home/homeassistant/.keys/ssh2rpi3 'sudo cat /sys/class/thermal/thermal_zone0/temp' || echo Connection failed."
    unit_of_measurement: "°C"
    value_template: '{{ value | multiply(0.001) | round(1) }}'

HomeAssistant in a venv

6

Thank you all for your reply.
@jocnnor
the log say this

Command failed: ssh [email protected] echo $((`cat /sys/class/thermal/thermal_zone0/temp|cut -c1-2`)).$((`cat /sys/class/thermal/thermal_zone0/temp|cut -c3-4`))

the command with -T also doesnt work

@tjntomas
I downloaded the image from the homepage and installed it on an mircosd and run it on a raspberry pi 4

@Bit-River @void
i havent try it now. i will do this in the next time

7

Hello everybody,
@Bit-River
I tried it but at the point with the chown command it says “unknown user/group hassio:hassio”
@void
I tried your commands but it is the same problem

8

Ah, I got that error too, but it didn’t stop the ssh command from working.

Do you get the same error message when the command line sensor tries to connect?

9

i got this error in the log

Command failed: ssh -i /config/ssh/id_rsa -o StrictHostKeyChecking=no [email protected] echo $((“cat /sys/class/thermal/thermal_zone0/temp|cut -c1-2”)).$((“cat /sys/class/thermal/thermal_zone0/temp|cut -c3-4”))

10

Hmmm, is the command part after the IP address surrounded by quotes?

I’m wondering if the ssh part is working, but now the command itself is causing the problem. Sometimes a command with a lot of quotes / special characters won’t work.

Also a good rule of thumb - if there are double-quotes in the command, then use single-quotes to surround it.

So, something like:

ssh -i /config/ssh/id_rsa -o StrictHostKeyChecking=no [email protected] 'echo $((“cat /sys/class/thermal/thermal_zone0/temp|cut -c1-2”)).$((“cat /sys/class/thermal/thermal_zone0/temp|cut -c3-4”))'

An alternative is to have a bash script on the Pi that runs the command, and your command_line sensor calls the script.

So:

ssh -i /config/ssh/id_rsa -o StrictHostKeyChecking=no [email protected] '/home/pi/my_temperature_script.sh'

11

Here look. if i put the command from my first post in the terminal it works.
i would try it with the bash script.
thank you

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