Adding SubscribeCOV to demo/server for testing.

bacnet-stack/include/bi.h

@@ -47,6 +47,8 @@ extern "C" {
         uint32_t object_instance);
     bool Binary_Input_Change_Of_Value(
         uint32_t object_instance);
+    void Binary_Input_Change_Of_Value_Clear(
+        uint32_t object_instance);
     int Binary_Input_Encode_Property_APDU(
         uint8_t * apdu,
         uint32_t object_instance,

bacnet-stack/include/handlers.h

@@ -143,7 +143,13 @@ extern "C" {
         BACNET_ERROR_CLASS * error_class,
         BACNET_ERROR_CODE * error_code);
 
-
+    void handler_cov_subscribe(
+        uint8_t * service_request,
+        uint16_t service_len,
+        BACNET_ADDRESS * src,
+        BACNET_CONFIRMED_SERVICE_DATA * service_data);
+    void handler_cov_task(
+        uint32_t elapsed_milliseconds);
 
 #ifdef __cplusplus
 }