When I run the start-digitalinputs.sh, it successfully kicks off dbus-digitalinput.py
with the command 
exec $(dirname $0)/dbus_digitalinputs.py $flags /dev/gpio/digital_input_*

ps shows it running.

2417 root     31788 S    {dbus_digitalinp} /usr/bin/python3 -u /opt/victronenergy/dbus-digitalinputs/dbus_digitalinputs.py --poll=poll /dev/gpio/digital_input_1 /dev

assuming the --poll=poll, tells it to monitor and send it's dbus message to the console.  
See if register the digital inputs 1-8.  Then I switch input 5 to Door alarm and it's displayed.

Then 5-10 minutes later you see it trace.  Haven't been in that Python script yet, you familiar with these lines?


root@raspberrypi4:~# /opt/victronenergy/dbus-digitalinputs/start-digitalinputs.sh
Registering GPIO 1 for type 0
Registering GPIO 2 for type 0
Registering GPIO 3 for type 0
Registering GPIO 4 for type 0
Registering GPIO 5 for type 0
Registering GPIO 6 for type 0
Registering GPIO 7 for type 0
Registering GPIO 8 for type 0
Registering GPIO 5 for type 2
Traceback (most recent call last):
  File "/opt/victronenergy/dbus-digitalinputs/dbus_digitalinputs.py", line 614, in poll
    for inp, level in pulses():
  File "/opt/victronenergy/dbus-digitalinputs/dbus_digitalinputs.py", line 169, in __call__
    v = int(fp.read())
ValueError: invalid literal for int() with base 10: b''