def sync():
    """
    Copy host->device only if changed
    :return: result of _exec_command() execution
    """
    adb_full_cmd = [v.ADB_COMMAND_PREFIX, v.ADB_COMMAND_SHELL ,v.ADB_COMMAND_SYNC]
    return _exec_command(adb_full_cmd)
Copy host->device only if changed
    :return: result of _exec_command() execution