diff --git a/py34/bacpypes/service/cov.py b/py34/bacpypes/service/cov.py
index 02887131..cbf87fdb 100644
--- a/py34/bacpypes/service/cov.py
+++ b/py34/bacpypes/service/cov.py
@@ -90,7 +90,7 @@ class Subscription(OneShotTask, DebugContents):
         'lifetime',
         )
 
-    def __init__(self, obj_ref, client_addr, proc_id, obj_id, confirmed, lifetime):
+    def __init__(self, obj_ref, client_addr, proc_id, obj_id, confirmed, lifetime, cov_inc):
         if _debug: Subscription._debug("__init__ %r %r %r %r %r %r", obj_ref, client_addr, proc_id, obj_id, confirmed, lifetime)
         OneShotTask.__init__(self)
 
@@ -103,6 +103,7 @@ def __init__(self, obj_ref, client_addr, proc_id, obj_id, confirmed, lifetime):
         self.obj_id = obj_id
         self.confirmed = confirmed
         self.lifetime = lifetime
+        self.covIncrement = cov_inc
 
         # if lifetime is non-zero, schedule the subscription to expire
         if lifetime != 0:
@@ -756,3 +757,83 @@ def do_SubscribeCOVRequest(self, apdu):
             if _debug: ChangeOfValueServices._debug("    - send a notification")
             deferred(cov_detection.send_cov_notifications, cov)
 
+    def do_SubscribeCOVPropertyRequest(self, apdu):
+        if _debug: ChangeOfValueServices._debug("do_SubscribeCOVPropertyRequest %r", apdu)
+
+        # extract the pieces
+        client_addr = apdu.pduSource
+        proc_id = apdu.subscriberProcessIdentifier
+        obj_id = apdu.monitoredObjectIdentifier
+        confirmed = apdu.issueConfirmedNotifications
+        lifetime = apdu.lifetime
+        prop_id = apdu.monitoredPropertyIdentifier
+        cov_inc = apdu.covIncrement
+
+        print("Dap: prop_id: {}, cov_inc: {}".format(prop_id,cov_inc))
+        # request is to cancel the subscription
+        cancel_subscription = (confirmed is None) and (lifetime is None)
+
+        # find the object
+        obj = self.get_object_id(obj_id)
+        if _debug: ChangeOfValueServices._debug("    - object: %r", obj)
+        if not obj:
+            raise ExecutionError(errorClass='object', errorCode='unknownObject')
+
+        # check to see if the object supports COV
+        if not obj._object_supports_cov:
+            raise ExecutionError(errorClass='services', errorCode='covSubscriptionFailed')
+
+        # look for an algorithm already associated with this object
+        cov_detection = self.cov_detections.get(obj, None)
+
+        # if there isn't one, make one and associate it with the object
+        if not cov_detection:
+            # look for an associated class and if it's not there it's not supported
+            criteria_class = criteria_type_map.get(obj_id[0], None)
+            if not criteria_class:
+                raise ExecutionError(errorClass='services', errorCode='covSubscriptionFailed')
+
+            # make one of these and bind it to the object
+            cov_detection = criteria_class(obj)
+
+            # keep track of it for other subscriptions
+            self.cov_detections[obj] = cov_detection
+        if _debug: ChangeOfValueServices._debug("    - cov_detection: %r", cov_detection)
+
+        # can a match be found?
+        cov = cov_detection.cov_subscriptions.find(client_addr, proc_id, obj_id)
+        if _debug: ChangeOfValueServices._debug("    - cov: %r", cov)
+
+        # if a match was found, update the subscription
+        if cov:
+            if cancel_subscription:
+                if _debug: ChangeOfValueServices._debug("    - cancel the subscription")
+                self.cancel_subscription(cov)
+            else:
+                if _debug: ChangeOfValueServices._debug("    - renew the subscription")
+                cov.renew_subscription(lifetime)
+        else:
+            if cancel_subscription:
+                if _debug: ChangeOfValueServices._debug("    - cancel a subscription that doesn't exist")
+            else:
+                if _debug: ChangeOfValueServices._debug("    - create a subscription")
+
+                # make a subscription
+                cov = Subscription(obj, client_addr, proc_id, obj_id,
+                                   confirmed, lifetime, cov_inc)
+                if _debug: ChangeOfValueServices._debug("    - cov: %r", cov)
+
+                # add it to our subscriptions lists
+                self.add_subscription(cov)
+
+        # success
+        response = SimpleAckPDU(context=apdu)
+
+        # return the result
+        self.response(response)
+
+        # if the subscription is not being canceled, it is new or renewed,
+        # so send it a notification when you get a chance.
+        if not cancel_subscription:
+            if _debug: ChangeOfValueServices._debug("    - send a notification")
+            deferred(cov_detection.send_cov_notifications, cov)
\ No newline at end of file
diff --git a/samples/COVClient.py b/samples/COVClient.py
index 41673e79..012c8e52 100755
--- a/samples/COVClient.py
+++ b/samples/COVClient.py
@@ -15,11 +15,12 @@
 from bacpypes.iocb import IOCB
 
 from bacpypes.pdu import Address
-from bacpypes.apdu import SubscribeCOVRequest, SimpleAckPDU, RejectPDU, AbortPDU
+from bacpypes.apdu import SubscribeCOVRequest, SimpleAckPDU, RejectPDU, AbortPDU, SubscribeCOVPropertyRequest
 from bacpypes.primitivedata import ObjectIdentifier
 
 from bacpypes.app import BIPSimpleApplication
 from bacpypes.local.device import LocalDeviceObject
+from bacpypes.basetypes import PropertyReference
 
 # some debugging
 _debug = 0
@@ -145,8 +146,14 @@ def do_subscribe(self, args):
                 lifetime = None
 
             # build a request
-            request = SubscribeCOVRequest(
-                subscriberProcessIdentifier=proc_id, monitoredObjectIdentifier=obj_id
+            # request = SubscribeCOVRequest(
+            #     subscriberProcessIdentifier=proc_id, monitoredObjectIdentifier=obj_id
+            # )
+            request = SubscribeCOVPropertyRequest(
+                subscriberProcessIdentifier=proc_id,
+                monitoredObjectIdentifier=obj_id,
+                monitoredPropertyIdentifier=PropertyReference(propertyIdentifier=85),
+                covIncrement=2
             )
             request.pduDestination = Address(addr)