Bugfix/service request refactor size check (#553)

* refactor service requests from service header

* add APDU size checking and length feature

* add unit tests to check for length when passing NULL buffer

---------

Co-authored-by: Steve Karg <skarg@users.sourceforge.net>

src/bacnet/rd.h

@@ -45,7 +45,6 @@ typedef bool(
 extern "C" {
 #endif /* __cplusplus */
 
-/* encode service */
     BACNET_STACK_EXPORT
     int rd_encode_apdu(
         uint8_t * apdu,
@@ -53,6 +52,17 @@ extern "C" {
         BACNET_REINITIALIZED_STATE state,
         BACNET_CHARACTER_STRING * password);
 
+    BACNET_STACK_EXPORT
+    int reinitialize_device_encode(uint8_t *apdu,
+        BACNET_REINITIALIZED_STATE state,
+        BACNET_CHARACTER_STRING *password);
+
+    BACNET_STACK_EXPORT
+    size_t reinitialize_device_request_encode(
+        uint8_t *apdu, size_t apdu_size, 
+        BACNET_REINITIALIZED_STATE state,
+        BACNET_CHARACTER_STRING *password);
+
 /* decode the service request only */
     BACNET_STACK_EXPORT
     int rd_decode_service_request(