[dua] handle coap error code for DUA.rsp (#5523)

- Configure next response to 5.00 for Reference Device
- Handle 5.00 (and other COAP error codes) in DUA.rsp (required by 1.2
  Test Spec)
- Update DUA test to handle COAP code 5.00

tests/scripts/thread-cert/node.py

@@ -723,7 +723,13 @@ class NodeImpl:
         self.remove_prefix(prefix)
         self.register_netdata()
 
-    def set_next_dua_response(self, status, iid=None):
+    def set_next_dua_response(self, status: Union[str, int], iid=None):
+        # Convert 5.00 to COAP CODE 160
+        if isinstance(status, str):
+            assert '.' in status
+            status = status.split('.')
+            status = (int(status[0]) << 5) + int(status[1])
+
         cmd = 'bbr mgmt dua {}'.format(status)
         if iid is not None:
             cmd += ' ' + str(iid)

tests/scripts/thread-cert/v1_2_test_domain_unicast_address_registration.py

@@ -281,8 +281,8 @@ class TestDomainUnicastAddressRegistration(thread_cert.TestCase):
         #   - increase BBR seqno to trigger reregistration
         #   - ROUTER_1_2 should re-register within BBR_REREGISTRATION_DELAY. For the not fatal errors, ROUTER_1_2
         #     should re-register within another BBR_REREGISTRATION_DELAY (with least delay if ST_DUA_REREGISTER)
-        for status in [ST_DUA_REREGISTER, ST_DUA_NO_RESOURCES, ST_DUA_BBR_NOT_PRIMARY, ST_DUA_GENERAL_FAILURE]:
-            print('Testing Status %d...'.format(status))
+        for status in ['5.00', ST_DUA_REREGISTER, ST_DUA_NO_RESOURCES, ST_DUA_BBR_NOT_PRIMARY, ST_DUA_GENERAL_FAILURE]:
+            print(f'Testing Status {status}...')
             # Flush relative message queues.
             self.flush_nodes([ROUTER_1_2])
             seq_num = seq_num + 1