diff --git a/samples/COVClientApp.py b/samples/COVClientApp.py
new file mode 100755
index 0000000..b2274c9
--- /dev/null
+++ b/samples/COVClientApp.py
@@ -0,0 +1,195 @@
+#!/usr/bin/env python
+
+"""
+Configured with a subscription context object which is passed to the
+application, it sends a SubscribeCOVRequest and listens for confirmed or
+unconfirmed COV notifications, lines them up with the context, and passes the
+APDU to the context to print out.
+
+Making multiple subscription contexts and keeping them active based on their
+lifetime is left as an exercise for the reader.
+"""
+
+from bacpypes.debugging import bacpypes_debugging, ModuleLogger
+from bacpypes.consolelogging import ConfigArgumentParser
+
+from bacpypes.core import run, deferred
+from bacpypes.iocb import IOCB
+
+from bacpypes.pdu import Address
+from bacpypes.apdu import SubscribeCOVRequest, SimpleAckPDU
+from bacpypes.errors import ExecutionError
+
+from bacpypes.app import BIPSimpleApplication
+from bacpypes.local.device import LocalDeviceObject
+
+# some debugging
+_debug = 0
+_log = ModuleLogger(globals())
+
+# globals
+this_application = None
+
+subscription_contexts = {}
+next_proc_id = 1
+
+#
+#   SubscriptionContext
+#
+
+@bacpypes_debugging
+class SubscriptionContext:
+
+    def __init__(self, address, objid, confirmed=None, lifetime=None):
+        if _debug: SubscriptionContext._debug("__init__ %r %r confirmed=%r lifetime=%r", address, objid, confirmed, lifetime)
+        global subscription_contexts, next_proc_id
+
+        # destination for subscription requests
+        self.address = address
+
+        # assign a unique process identifer and keep track of it
+        self.subscriberProcessIdentifier = next_proc_id
+        next_proc_id += 1
+        subscription_contexts[self.subscriberProcessIdentifier] = self
+
+        self.monitoredObjectIdentifier = objid
+        self.issueConfirmedNotifications = confirmed
+        self.lifetime = lifetime
+
+    def cov_notification(self, apdu):
+        if _debug: SubscriptionContext._debug("cov_notification %r", apdu)
+
+        # make a rash assumption that the property value is going to be
+        # a single application encoded tag
+        print("{} {} changed\n    {}".format(
+            apdu.pduSource,
+            apdu.monitoredObjectIdentifier,
+            ",\n    ".join("{} = {}".format(
+                element.propertyIdentifier,
+                str(element.value.tagList[0].app_to_object().value),
+                ) for element in apdu.listOfValues),
+            ))
+
+#
+#   SubscribeCOVApplication
+#
+
+@bacpypes_debugging
+class SubscribeCOVApplication(BIPSimpleApplication):
+
+    def __init__(self, *args):
+        if _debug: SubscribeCOVApplication._debug("__init__ %r", args)
+        BIPSimpleApplication.__init__(self, *args)
+
+    def send_subscription(self, context):
+        if _debug: SubscribeCOVApplication._debug("send_subscription %r", context)
+
+        # build a request
+        request = SubscribeCOVRequest(
+            subscriberProcessIdentifier=context.subscriberProcessIdentifier,
+            monitoredObjectIdentifier=context.monitoredObjectIdentifier,
+            )
+        request.pduDestination = context.address
+
+        # optional parameters
+        if context.issueConfirmedNotifications is not None:
+            request.issueConfirmedNotifications = context.issueConfirmedNotifications
+        if context.lifetime is not None:
+            request.lifetime = context.lifetime
+
+        # make an IOCB
+        iocb = IOCB(request)
+        if _debug: SubscribeCOVApplication._debug("    - iocb: %r", iocb)
+
+        # callback when it is acknowledged
+        iocb.add_callback(self.subscription_acknowledged)
+
+        # give it to the application
+        this_application.request_io(iocb)
+
+    def subscription_acknowledged(self, iocb):
+        if _debug: SubscribeCOVApplication._debug("subscription_acknowledged %r", iocb)
+
+        # do something for success
+        if iocb.ioResponse:
+            if _debug: SubscribeCOVApplication._debug("    - response: %r", iocb.ioResponse)
+
+        # do something for error/reject/abort
+        if iocb.ioError:
+            if _debug: SubscribeCOVApplication._debug("    - error: %r", iocb.ioError)
+
+    def cov_notification(self, apdu):
+        if _debug: SubscribeCOVApplication._debug("cov_notification %r", apdu)
+
+    def do_ConfirmedCOVNotificationRequest(self, apdu):
+        if _debug: SubscribeCOVApplication._debug("do_ConfirmedCOVNotificationRequest %r", apdu)
+
+        # look up the process identifier
+        context = subscription_contexts.get(apdu.subscriberProcessIdentifier, None)
+        if not context or apdu.pduSource != context.address:
+            if _debug: SubscribeCOVApplication._debug("    - no context")
+
+            # this is turned into an ErrorPDU and sent back to the client
+            raise ExecutionError('services', 'unknownSubscription')
+
+        # now tell the context object
+        context.cov_notification(apdu)
+
+        # success
+        response = SimpleAckPDU(context=apdu)
+        if _debug: SubscribeCOVApplication._debug("    - simple_ack: %r", response)
+
+        # return the result
+        self.response(response)
+
+    def do_UnconfirmedCOVNotificationRequest(self, apdu):
+        if _debug: SubscribeCOVApplication._debug("do_UnconfirmedCOVNotificationRequest %r", apdu)
+
+        # look up the process identifier
+        context = subscription_contexts.get(apdu.subscriberProcessIdentifier, None)
+        if not context or apdu.pduSource != context.address:
+            if _debug: SubscribeCOVApplication._debug("    - no context")
+            return
+
+        # now tell the context object
+        context.cov_notification(apdu)
+
+#
+#   __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(
+        objectName=args.ini.objectname,
+        objectIdentifier=int(args.ini.objectidentifier),
+        maxApduLengthAccepted=int(args.ini.maxapdulengthaccepted),
+        segmentationSupported=args.ini.segmentationsupported,
+        vendorIdentifier=int(args.ini.vendoridentifier),
+        )
+
+    # make a simple application
+    this_application = SubscribeCOVApplication(this_device, args.ini.address)
+
+    # make a subscription context
+    context = SubscriptionContext(Address("10.0.1.31"), ('analogValue', 1), False, 60)
+
+    # send the subscription when the stack is ready
+    deferred(this_application.send_subscription, context)
+
+    _log.debug("running")
+
+    run()
+
+    _log.debug("fini")
+
+if __name__ == "__main__":
+    main()