protected ChannelSet(String url, HttpClient client, int user_id,
                         byte[] pass) {
        Password = pass;
        URL = url;
        Client = client;
        UserID = user_id;
        byte[] user_id_array = {
                               (byte) ((user_id & 0xff000000) >> 24),
                               (byte) ((user_id & 0x00ff0000) >> 16),
                               (byte) ((user_id & 0x0000ff00) >> 8),
                               (byte) ((user_id & 0x000000ff) >> 0),
        };
        UserID_Array = user_id_array;
        ChannelNo = 0xFFFFFFFF;
        byte[] channel_no_array = {(byte) 0xff, (byte) 0xff, (byte) 0xff,
                                  (byte) 0xff, };
        ChannelNo_Array = channel_no_array;
        Cipher = null;
    }