Fixed the NDPU encoding for confirmed COV notifications (#917)

src/bacnet/basic/service/h_cov.c

@@ -472,7 +472,9 @@ static bool cov_send_request(
         return status;
     }
     datalink_get_my_address(&my_address);
-    npdu_encode_npdu_data(&npdu_data, false, MESSAGE_PRIORITY_NORMAL);
+    npdu_encode_npdu_data(
+        &npdu_data, cov_subscription->flag.issueConfirmedNotifications,
+        MESSAGE_PRIORITY_NORMAL);
     pdu_len = npdu_encode_pdu(
         &Handler_Transmit_Buffer[0], dest, &my_address, &npdu_data);
     /* load the COV data structure for outgoing message */
@@ -486,7 +488,6 @@ static bool cov_send_request(
     cov_data.timeRemaining = cov_subscription->lifetime;
     cov_data.listOfValues = value_list;
     if (cov_subscription->flag.issueConfirmedNotifications) {
-        npdu_data.data_expecting_reply = true;
         invoke_id = tsm_next_free_invokeID();
         if (invoke_id) {
             cov_subscription->invokeID = invoke_id;