public virtual IActionResult PostRegisterEndpointForClient(
            [FromRoute] Guid clientUid,
            [FromRoute] Guid endpointUid)
        {
            if ((clientUid == Guid.Empty) || (endpointUid == Guid.Empty))
            {
                return(StatusCode((int)HttpStatusCode.BadRequest));
            }

            // register this client to this endpoint
            EndpointManager.RegisterClientForEndpoint(clientUid, endpointUid);

            return(StatusCode((int)HttpStatusCode.Created));
        }