MultipleReadProperty.py

#!/usr/bin/env python

"""
Mutliple Read Property

This application has a static list of points that it would like to read.  It reads the
values of each of them in turn and then quits.
"""

from collections import deque

from bacpypes.debugging import bacpypes_debugging, ModuleLogger
from bacpypes.consolelogging import ConfigArgumentParser

from bacpypes.core import run, stop, deferred
from bacpypes.iocb import IOCB

from bacpypes.pdu import Address
from bacpypes.object import get_datatype

from bacpypes.apdu import ReadPropertyRequest
from bacpypes.primitivedata import Unsigned, ObjectIdentifier
from bacpypes.constructeddata import Array

from bacpypes.app import BIPSimpleApplication
from bacpypes.local.device import LocalDeviceObject

# some debugging
_debug = 0
_log = ModuleLogger(globals())

# globals
this_application = None

# point list, set according to your device
point_list = [
    ('10.0.1.14', 'analogValue:1', 'presentValue'),
    ('10.0.1.14', 'analogValue:2', 'presentValue'),
    ]

#
#   ReadPointListApplication
#

@bacpypes_debugging
class ReadPointListApplication(BIPSimpleApplication):

    def __init__(self, point_list, *args):
        if _debug: ReadPointListApplication._debug("__init__ %r, %r", point_list, args)
        BIPSimpleApplication.__init__(self, *args)

        # turn the point list into a queue
        self.point_queue = deque(point_list)

        # make a list of the response values
        self.response_values = []

    def next_request(self):
        if _debug: ReadPointListApplication._debug("next_request")

        # check to see if we're done
        if not self.point_queue:
            if _debug: ReadPointListApplication._debug("    - done")
            stop()
            return

        # get the next request
        addr, obj_id, prop_id = self.point_queue.popleft()
        obj_id = ObjectIdentifier(obj_id).value

        # build a request
        request = ReadPropertyRequest(
            objectIdentifier=obj_id,
            propertyIdentifier=prop_id,
            )
        request.pduDestination = Address(addr)
        if _debug: ReadPointListApplication._debug("    - request: %r", request)

        # make an IOCB
        iocb = IOCB(request)

        # set a callback for the response
        iocb.add_callback(self.complete_request)
        if _debug: ReadPointListApplication._debug("    - iocb: %r", iocb)

        # send the request
        this_application.request_io(iocb)

    def complete_request(self, iocb):
        if _debug: ReadPointListApplication._debug("complete_request %r", iocb)

        if iocb.ioResponse:
            apdu = iocb.ioResponse

            # find the datatype
            datatype = get_datatype(apdu.objectIdentifier[0], apdu.propertyIdentifier)
            if _debug: ReadPointListApplication._debug("    - datatype: %r", datatype)
            if not datatype:
                raise TypeError("unknown datatype")

            # special case for array parts, others are managed by cast_out
            if issubclass(datatype, Array) and (apdu.propertyArrayIndex is not None):
                if apdu.propertyArrayIndex == 0:
                    value = apdu.propertyValue.cast_out(Unsigned)
                else:
                    value = apdu.propertyValue.cast_out(datatype.subtype)
            else:
                value = apdu.propertyValue.cast_out(datatype)
            if _debug: ReadPointListApplication._debug("    - value: %r", value)

            # save the value
            self.response_values.append(value)

        if iocb.ioError:
            if _debug: ReadPointListApplication._debug("    - error: %r", iocb.ioError)
            self.response_values.append(iocb.ioError)

        # fire off another request
        deferred(self.next_request)

#
#   __main__
#

def main():
    global this_application

    # parse the command line arguments
    args = ConfigArgumentParser(description=__doc__).parse_args()

    if _debug: _log.debug("initialization")
    if _debug: _log.debug("    - args: %r", args)

    # make a device object
    this_device = LocalDeviceObject(ini=args.ini)
    if _debug: _log.debug("    - this_device: %r", this_device)

    # make a simple application
    this_application = ReadPointListApplication(point_list, this_device, args.ini.address)

    # fire off a request when the core has a chance
    deferred(this_application.next_request)

    _log.debug("running")

    run()

    # dump out the results
    for request, response in zip(point_list, this_application.response_values):
        print(request, response)

    _log.debug("fini")


if __name__ == "__main__":
    main()