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https://github.com/JoelBender/bacpypes
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143 lines
4.2 KiB
Python
Executable File
143 lines
4.2 KiB
Python
Executable File
#!/usr/bin/python
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"""
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This sample application shows how to extend one of the basic objects, an Analog
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Value Object in this case, to provide a present value. This type of code is used
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when the application is providing a BACnet interface to a collection of data.
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It assumes that almost all of the default behaviour of a BACpypes application is
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sufficient.
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"""
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import random
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from bacpypes.debugging import bacpypes_debugging, ModuleLogger
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from bacpypes.consolelogging import ConfigArgumentParser
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from bacpypes.core import run
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from bacpypes.primitivedata import Real
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from bacpypes.app import LocalDeviceObject, BIPSimpleApplication
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from bacpypes.object import AnalogValueObject, Property, register_object_type
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from bacpypes.errors import ExecutionError
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# some debugging
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_debug = 0
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_log = ModuleLogger(globals())
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# globals
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vendor_id = 999
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#
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# RandomValueProperty
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#
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@bacpypes_debugging
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class RandomValueProperty(Property):
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def __init__(self, identifier):
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if _debug: RandomValueProperty._debug("__init__ %r", identifier)
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Property.__init__(self, identifier, Real, default=None, optional=True, mutable=False)
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# writing to this property changes the multiplier
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self.multiplier = 100.0
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def ReadProperty(self, obj, arrayIndex=None):
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if _debug: RandomValueProperty._debug("ReadProperty %r arrayIndex=%r", obj, arrayIndex)
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# access an array
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if arrayIndex is not None:
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raise ExecutionError(errorClass='property', errorCode='propertyIsNotAnArray')
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# return a random value
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value = random.random() * self.multiplier
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if _debug: RandomValueProperty._debug(" - value: %r", value)
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return value
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def WriteProperty(self, obj, value, arrayIndex=None, priority=None, direct=False):
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if _debug: RandomValueProperty._debug("WriteProperty %r %r arrayIndex=%r priority=%r direct=%r", obj, value, arrayIndex, priority, direct)
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# change the multiplier
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self.multiplier = value
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#
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# Vendor Analog Value Object Type
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#
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@bacpypes_debugging
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class VendorAVObject(AnalogValueObject):
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objectType = 513
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properties = [
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RandomValueProperty(5504),
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]
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def __init__(self, **kwargs):
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if _debug: VendorAVObject._debug("__init__ %r", kwargs)
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AnalogValueObject.__init__(self, **kwargs)
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register_object_type(VendorAVObject, vendor_id=vendor_id)
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#
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# main
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#
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@bacpypes_debugging
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def main():
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if _debug: main._debug("initialization")
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try:
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# parse the command line arguments
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args = ConfigArgumentParser(description=__doc__).parse_args()
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if _debug: main._debug("initialization")
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if _debug: main._debug(" - args: %r", args)
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# make a device object
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this_device = LocalDeviceObject(
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objectName=args.ini.objectname,
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objectIdentifier=int(args.ini.objectidentifier),
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maxApduLengthAccepted=int(args.ini.maxapdulengthaccepted),
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segmentationSupported=args.ini.segmentationsupported,
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vendorIdentifier=vendor_id,
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)
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# make a sample application
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this_application = BIPSimpleApplication(this_device, args.ini.address)
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# get the services supported
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services_supported = this_application.get_services_supported()
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if _debug: _log.debug(" - services_supported: %r", services_supported)
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# let the device object know
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this_device.protocolServicesSupported = services_supported.value
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# make some objects
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ravo1 = VendorAVObject(
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objectIdentifier=(513, 1), objectName='Random1'
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)
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if _debug: main._debug(" - ravo1: %r", ravo1)
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ravo2 = VendorAVObject(
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objectIdentifier=(513, 2), objectName='Random2'
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)
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if _debug: main._debug(" - ravo2: %r", ravo2)
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# add it to the device
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this_application.add_object(ravo1)
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this_application.add_object(ravo2)
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if _debug: main._debug(" - object list: %r", this_device.objectList)
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if _debug: main._debug("running")
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run()
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except Exception as error:
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main._exception("an error has occurred: %s", error)
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finally:
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if _debug: main._debug("finally")
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if __name__ == '__main__':
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main()
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