I can't start the systemd service on my RasperryPI

[mnsami]

Hello, I followed your steps for the setup following the blog of Pieter https://www.pieterbrinkman.com/2022/02/01/make-your-city-heating-stadsverwarming-smart-and-connect-it-home-assistant-energy-dashboard/#comment-20805

But whenever I run sudo systemctl start kamstrup_meter.service the system freeze and the service doesn't start.

I'm not sure what i'm doing wrong.

I have the project checkout in the /opt folder, with below permissions

pi@pi-mr:/opt/kamstrup $ ls -lah
total 76K
drwxr-xr-x 6 pi   pi   4.0K Apr 18 22:51 .
drwxr-xr-x 3 root root 4.0K Apr 18 22:34 ..
-rw-r--r-- 1 pi   pi    371 Apr 18 22:36 config.yaml
-rw-r--r-- 1 pi   pi   2.5K Apr 18 22:34 daemon.py
-rw-r--r-- 1 pi   pi    252 Apr 18 22:34 docker-compose.yml
-rw-r--r-- 1 pi   pi    228 Apr 18 22:34 Dockerfile
drwxr-xr-x 8 pi   pi   4.0K Apr 18 22:34 .git
-rw-r--r-- 1 pi   pi     30 Apr 18 22:34 .gitignore
drwxr-xr-x 2 pi   pi   4.0K Apr 18 22:34 images
-rw-r--r-- 1 pi   pi   5.1K Apr 18 22:34 kamstrup_meter.py
-rw-r--r-- 1 pi   pi    288 Apr 18 22:44 kamstrup_meter.service
-rw-r--r-- 1 pi   pi   1.1K Apr 18 22:34 LICENSE
drwxr-xr-x 2 pi   pi   4.0K Apr 18 22:41 logs
-rw-r--r-- 1 pi   pi   2.1K Apr 18 22:34 mqtt_handler.py
drwxr-xr-x 2 pi   pi   4.0K Apr 18 22:41 __pycache__
-rw-r--r-- 1 pi   pi   7.9K Apr 18 22:34 readme.md
-rw-r--r-- 1 pi   pi     27 Apr 18 22:34 requirements.txt

and I have configure the systemd service to run as follows

[Unit]
Description=Kamstrup2mqtt Service
After=multi-user.target

[Service]
User=pi
Type=simple
WorkingDirectory=/opt/kamstrup
ExecStart=/usr/bin/python3 /opt/kamstrup/daemon.py
StandardOutput=null
StandardError=journal
Restart=always

[Install]
WantedBy=multi-user.target

BTW, running the script via command line send the output correctly

Thank you in advance

[jrkalf]

Hi @mnsami,

Just covering the basic questions here.

1. did you configure your config.yaml to point to the correct serial device?
2. You claim the system freezes. Do you have a strong powersupply to the Raspberry Pi ? I know the IR reader can be a bit power hungry. If your system freezes, it might be draining too much power causing the whole system to too low on power and die.

[matthijsvisser]

Hi,

I see that you've added "user=pi" to the systemd file. Does it work without specifying that user? You can also try to add "group=" with the users group.

[mnsami]

thanks @matthijsvisser for the help, it is working now, but for some reason the readings stop after some time ? might it be possible that the meter go to sleep mode from time to time ?

If so, how can I prevent that from happening in the future ? any tips and tricks ?

below is the last log entries

2023-05-05 11:35:58 daemon.py __init__:  34 - INFO - initializing daemon]
[2023-05-05 11:36:04 daemon.py __init__:  34 - INFO - initializing daemon]
[2023-05-05 11:36:15 daemon.py __init__:  34 - INFO - initializing daemon]
[2023-05-05 11:36:24 daemon.py __init__:  34 - INFO - initializing daemon]
[2023-05-05 11:36:32 daemon.py __init__:  34 - INFO - initializing daemon]

it looks to me that the daemon was trying to restart then it stopped

I appreciate all the effort you spent for your support and awesomeness !

[matthijsvisser]

thanks @matthijsvisser for the help, it is working now, but for some reason the readings stop after some time ? might it be possible that the meter go to sleep mode from time to time ?

If so, how can I prevent that from happening in the future ? any tips and tricks ?

below is the last log entries

2023-05-05 11:35:58 daemon.py __init__:  34 - INFO - initializing daemon]
[2023-05-05 11:36:04 daemon.py __init__:  34 - INFO - initializing daemon]
[2023-05-05 11:36:15 daemon.py __init__:  34 - INFO - initializing daemon]
[2023-05-05 11:36:24 daemon.py __init__:  34 - INFO - initializing daemon]
[2023-05-05 11:36:32 daemon.py __init__:  34 - INFO - initializing daemon]

it looks to me that the daemon was trying to restart then it stopped

I appreciate all the effort you spent for your support and awesomeness !

Which meter do you got? The 402 can be manually activated by pressing a button on the meter and will need to be polled by the scripts at least once every 30 minutes to remain active. Other models only require a strong magnet to remain active.

An other thought: is your meterhead fixed in place on the meter? If not, you can try to do so with tape when you've found the right spot.