update last post about netatmo-driver

content/posts/2023-07-15-update-weewx-netatmo-extension/index.md

@@ -3,7 +3,7 @@
 title = 'Update weewx-netatmo extension'
 summary = 'Upgrade the authentication method from _password_ to _preauthenticated refresh_token_'
 date = '2023-07-15T17:02:10+02:00'
-lastmod = '2023-07-21T21:07:06+0000'
+lastmod = '2023-07-23T15:16:24+0000'
 categories = [ 'amateur-radio' ]
 tags = [ 'wx', 'weewx', 'netatmo', 'server', 'selfhost' ]
 
@@ -69,3 +69,30 @@ A restart of WeeWX should fetch the data again.
 $ doas rcctl restart weewx
 ```
 
+## Problems on a Raspberry Pi?
+
+I'm not sure about the cause of this behaviour, but **Andreas DG0LFL** reported, that his
+Raspberry Pi 4 (running Debian 10 Buster) could not update the token so he solved this by
+creating `/etc/systemd/system/weewx.timer` with the following contents:
+
+```ini
+[Unit]
+Description=WeeWX-Timer
+
+[Timer]
+OnBootSec=5min
+OnUnitActiveSec=120min
+Unit=weewx.service
+
+[Install]
+WantedBy=multi-user.target
+```
+
+As for my understanding this should start `weewx.service` 5 minutes after system boot as well as
+every 120 minutes after the services last start.
+
+He had noticed, that the netatmo-driver wasn't updating the token so it got invalid after 10800
+seconds (3 hours).
+
+You would probably need to run `systemctl enable weewx.timer` to enable the timer.
+