make add_method_callback sync

asyncua/common/manage_nodes.py

@@ -371,7 +371,7 @@ async def _create_method(parent, nodeid, qname, callback, inputs, outputs):
             datatype=ua.ObjectIds.Argument
         )
     if hasattr(parent.server, "add_method_callback"):
-        await parent.server.add_method_callback(method.nodeid, callback)
+        parent.server.add_method_callback(method.nodeid, callback)
     return results[0].AddedNodeId
 
 

asyncua/server/internal_session.py

@@ -111,7 +111,7 @@ class InternalSession:
     async def delete_references(self, params):
         return self.iserver.node_mgt_service.delete_references(params, self.user)
 
-    async def add_method_callback(self, methodid, callback):
+    def add_method_callback(self, methodid, callback):
         return self.aspace.add_method_callback(methodid, callback)
 
     def call(self, params):

asyncua/server/server.py

@@ -555,14 +555,14 @@ class Server:
     def unsubscribe_server_callback(self, event, handle):
         self.iserver.unsubscribe_server_callback(event, handle)
 
-    async def link_method(self, node, callback):
+    def link_method(self, node, callback):
         """
         Link a python function to a UA method in the address space; required when a UA method has been imported
         to the address space via XML; the python executable must be linked manually
         :param node: UA method node
         :param callback: python function that the UA method will call
         """
-        await self.iserver.isession.add_method_callback(node.nodeid, callback)
+        self.iserver.isession.add_method_callback(node.nodeid, callback)
 
     def load_type_definitions(self, nodes=None) -> Coroutine:
         """