Command line sensor question

Configuration
1

On my odroid n2+ system I want get working communication with external device via sensor command
Command which I’m sending is from device manual and tested that’s working.

Command line Sensor - Home Assistant (home-assistant.io)

Into configuration.yaml I added :

# Example configuration.yaml entry
sensor:
  - platform: command_line
    name: Heat unit
    command: "echo -en '\x10\x01\xFF\xFF\x10\x30\xF8\x02\xE3\x61\xFF' > /dev/ttyUSB0"
    unit_of_measurement: "°C"
    value_template: "{{ value | multiply(0.001) | round(1) }}"

Question is how to call this command and how read a response ?

2

You don’t. Home Assistant will send the command regularly (polling) and update the state for you.

3

so on the main screen I will add only entity ?
I can’t see any with name Heat unit

4

Look in developer Tools → States, do you see sensor.heat_unit?

If not, check your logs for errors.

You did do a config check and restart Home Assistant after creating it, didn’t you?

5

no not there and in the log I can see :

2022-09-05 08:02:16.401 ERROR (MainThread) [homeassistant.components.sensor] command_line: Error on device update!
6

I found a reason of the problem here :

value_template: "{{ value | multiply(0.001) | round(1) }}"

so I changed to :

value_template: "{{ value }}"

only to see what is received
problem is that value is still 0
image