Eventually stops detecting devices, confidence reports as zero until I reboot

[tmchow]

When presence is running for awhile, if then stops reporting confidence. Always zero until I reboot which then fixes it.

My behavior_preferences file is this:

#DELAY BETWEEN SCANS OF OWNER DEVICES WHEN AWAY FROM HOME
delay_between_owner_scans_away=6

#DELAY BETWEEN SCANS OF OWNER DEVICES WHEN HOME
delay_between_owner_scans_present=20

#HOW MANY VERIFICATIONS ARE REQUIRED TO DETERMINE A DEVICE IS AWAY
verification_of_away_loop_size=6

#HOW LONG TO DELAY BETWEEN VERIFICATIONS THAT A DEVICE IS AWAY
verification_of_away_loop_delay=3

#PREFERRED HCI DEVICE
hci_device='hci0'

If i then check the status using systemctl, I get network errors:

pi@pi-presence:~/presence $ sudo systemctl status presence.service
● presence.service - Presence service
   Loaded: loaded (/etc/systemd/system/presence.service; enabled; vendor preset: enabled)
   Active: active (running) since Mon 2019-07-15 19:37:57 BST; 27min ago
 Main PID: 229 (bash)
   CGroup: /system.slice/presence.service
           ├─ 229 /bin/bash /home/pi/presence/presence.sh &
           ├─4450 /bin/bash /home/pi/presence/presence.sh &
           ├─4451 /bin/bash /home/pi/presence/presence.sh &
           ├─4452 hcitool -i hci0 name 38:53:9C:9A:BC:02
           ├─4453 grep -v not available
           └─4454 grep -vE hcitool|timeout|invalid|error

Jul 15 19:47:18 pi-presence bash[229]: Error: Network is unreachable
Jul 15 19:47:20 pi-presence bash[229]: Error: Network is unreachable
Jul 15 19:55:18 pi-presence bash[229]: Error: Network is unreachable
Jul 15 19:55:26 pi-presence bash[229]: Error: Network is unreachable
Jul 15 19:55:27 pi-presence bash[229]: Error: Network is unreachable
Jul 15 19:55:29 pi-presence bash[229]: Error: Network is unreachable
Jul 15 19:55:29 pi-presence bash[229]: Error: Network is unreachable
Jul 15 19:55:38 pi-presence bash[229]: Error: Network is unreachable
Jul 15 19:56:09 pi-presence bash[229]: Error: Network is unreachable
Jul 15 20:00:25 pi-presence bash[229]: Error: Network is unreachable

If I then restart, I seem to get back into a good state:

pi@pi-presence:~/presence $ sudo systemctl status presence.service
● presence.service - Presence service
   Loaded: loaded (/etc/systemd/system/presence.service; enabled; vendor preset: enabled)
   Active: active (running) since Mon 2019-07-15 20:05:29 BST; 3s ago
 Main PID: 4513 (bash)
   CGroup: /system.slice/presence.service
           ├─4513 /bin/bash /home/pi/presence/presence.sh &
           ├─4526 /bin/bash /home/pi/presence/presence.sh &
           ├─4527 /bin/bash /home/pi/presence/presence.sh &
           ├─4528 hcitool -i hci0 name 3C:28:6D:1D:8E:66
           ├─4529 grep -v not available
           └─4530 grep -vE hcitool|timeout|invalid|error

Jul 15 20:05:29 pi-presence systemd[1]: Started Presence service.```

This might be unrelated but trying to figure out why it will suddenly stop detecting devices.

[UhtredTheBold]

I'm seeing the exact same thing since yesterday on my raspberry pi zerow. the confidence stopped reporting at 1am and I saw the same messages in the service status. I tried restarting the service but it was only after a reboot that everything came back.

It had been working for 6+ months without a hiccup but yesterday happens to be when I upgraded to raspbian buster which seems a hell of a coincidence.