def File.mv(oldname, newname)
    request = Packet.create_request(COMMAND_ID_STDAPI_FS_FILE_MOVE)

    request.add_tlv(TLV_TYPE_FILE_NAME, client.unicode_filter_decode( oldname ))
    request.add_tlv(TLV_TYPE_FILE_PATH, client.unicode_filter_decode( newname ))