Help me... how to use bacpypes send the addListElement request

[YishanLI3]

Hi everybody. I am engaged in a project which need use bacpypes send the addListElement request to a bacnet device. can anyone give me an example to show how to implement this function. Thanks in advance! and thanks a lot!!

[JoelBender]

Assume you want to add tamper to one of the alarm values of an access
door.

>>> from bacpypes.basetypes import DoorAlarmState
>>> DoorAlarmState("tamper")
<bacpypes.basetypes.DoorAlarmState object at 0x7f08cdb9e7a0>

Now build a Python array of values and pass it to construct a BACnet list,
note that ListOf takes another class as a parameter and returns a class:

>>> from bacpypes.constructeddata import ListOf, Any
>>> list_of_elements = ListOf(DoorAlarmState)([DoorAlarmState("tamper")])

An Any object can hold anything, but whatever it is needs to be "cast in":

>>> more_alarm_values = Any()
>>> more_alarm_values.cast_in(list_of_elements)

Now build the request:

>>> request = AddListElementRequest(
...     objectIdentifier=('accessDoor', 12),
...     propertyIdentifier='alarmValues',
...     listOfElements=more_alarm_values,
... )
>>> 
>>> request.debug_contents()
    pduExpectingReply = 1
    pduNetworkPriority = 0
    apduType = 0
    apduService = 8
    objectIdentifier = ('accessDoor', 12)
    propertyIdentifier = 'alarmValues'
    listOfElements
            <bacpypes.primitivedata.Tag(enumerated) instance at 0x7f08cd1db880>
                tagClass = 0 application
                tagNumber = 9 enumerated
                tagLVT = 1
                tagData = '04'
    pduData = x''
>>> 

Celebrate success!