This is a service for venus on the beaglebone (Venus GX), though it may be applicable to other platforms as well. It reads the digital input pins and depending on the configuration, it will either count the pulses delivered by an external meter and publish the count and volume measured, or simply publish the state of an input so that it can be used by other services or as an alarm input.
Normally the service will be started by a daemontools run script. However, to run it manually on a beaglebone aka Venus GX, use this command:
python dbus_digitalinputs.py /dev/gpio/digital_input_*
On the first run it will create the user settings for the 5 digital inputs:
/Settings/DigitalInput/x/Function [0=Disabled, 1=Pulse meter, 2=Digital Input]
/Settings/DigitalInput/x/Type Only used when Function=2, [0=Door alarm, 1=Bilge alarm, 2=Burglar alarm, 3=Smoke alarm, 4=Fire alarm, 5=CO2 alarm]
/Settings/DigitalInput/x/Multiplier cubic meters per pulse, defaults to 0.001
/Settings/DigitalInput/x/Inverted [0=Pin is active high, 1=Pin is active low]
It also creates one other path for each input:
/Settings/DigitalInput/x/Count non-volatile store for the actual pulse count
Inputs with their function set to pulse meter will create a service
com.victronenergy.pulsemeter.input0x, and these paths:
/Aggregate the measured amount in cubic meters
/Count counted pulses
Inputs with their function set to digital input will create a service
com.victronenergy.digitalinput.input0x, and these dbus paths:
/State 0 when active, 1 when inactive
/Count count of active pulses
/Type Text string describing the input type