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docu: sudo-less run on Raspberry

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uhi22 2023-05-26 17:27:13 +02:00
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doc/installation_on_raspberry.md
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@ -98,6 +98,16 @@ Open a second console window, and start here the pev in simulation mode
`sudo python pyPlc.py P S`.
We should see how the EVSE and PEV are talking to each other.
## Sudo-less run of pyPLC
The access to the ethernet raw data requires sudo. To avoid this, the following setting may help:
- Find out the path of python: `which python`. This gives something like /usr/bin/python
- Find out the "real" name of the python. The above /usr/bin/python may be a link, but we need the location where it points to.
`ls -al /usr/bin | grep python`. This shows e.g. that python is a link to python3, and python3 is a link to python3.9, and this is the real file.
- Give python the permission to access the raw ethernet traffic, e.g. `sudo setcap cap_net_raw,cap_net_admin=eip /usr/bin/python3.9`
(discussed in https://github.com/SmartEVSE/SmartEVSE-3/issues/25#issuecomment-1563519025)
- When this was done, the `python pyPlc.py E` etc work without `sudo`.
## Auto-start of the PEV software
Use case: You use a RaspberryPi in the car, and want to start the charging software just by powering-up the Raspberry.
@ -138,6 +148,11 @@ the service:
sudo systemctl start pev.service
```
To stop the service:
```
sudo systemctl stop pev.service
```
To view the log of the service, run
- `journalctl --unit=pev` or
- `journalctl -f -u pev.service`