internal static string Ctrl(string port, IOPortAction action, string response) { string api = "/api/ioPctrl"; api = string.Concat(api, "?port=", port); api = string.Concat(api, "&action=", action.ToString().ToLower()); if (string.IsNullOrEmpty(response)) { api = string.Concat(api, "&response=", response); } return(api); }