def test_make_iocb(self):
"""inputs
-------
read_args : (iterable) of ('', 'read', <address>, <object_identifier>)
address : (str) BACnet IP address of device we are trying to
communicate with. Example 192.168.1.100
object_identifier : (str) BACnet Object Identifier of the device
defined in 'address'. This is of the form
<ObjectType>:<Instance>.
Typical values for ObjectType can be found where?
"""
read_args = ('192.168.1.100', 'analogValue:1')
addr, obj_id = read_args[:2]
obj_id = ObjectIdentifier(obj_id).value
# Enforce a specific object type
if not get_object_class(
obj_id[0]): # bacpypes.object.AnalogInputObject
raise ValueError("unknown object type")
# implement a default property, the bain of committee meetings
if len(read_args) == 3:
prop_id = read_args[2]
else:
prop_id = "presentValue"
# look for its datatype, an easy way to see if the property is
# appropriate for the object
datatype = get_datatype(obj_id[0], prop_id)
if not datatype:
raise ValueError("invalid property for object type")
# build a request
request = ReadPropertyRequest(objectIdentifier=obj_id,
propertyIdentifier=prop_id)
request.pduDestination = Address(addr)
# look for an optional array index
if len(read_args) == 5:
request.propertyArrayIndex = int(read_args[4])
# make an IOCB
iocb = IOCB(request)
# Information related to destination and network control (context information and processing instructions)
apci_contents = request.apci_contents()
self.assertEqual(apci_contents['destination'], read_args[0])
# Read property requests always require a confirmation PDU
self.assertEqual(apci_contents['apduType'], 'ConfirmedRequestPDU')
# This test only applies to ReadPropertyRequests
self.assertEqual(apci_contents['apduService'], 'ReadPropertyRequest')
# Information related to DATA
apdu_contents = request.apdu_contents()
self.assertEqual(apdu_contents['function'], 'ReadPropertyRequest')
self.assertEqual(apdu_contents['objectIdentifier'], ('analogValue', 1))
self.assertEqual(apdu_contents['propertyIdentifier'], 'presentValue')
# Testing of IOCB - not much to test
self.assertIsInstance(iocb.args[0], ReadPropertyRequest)
return None
