initialize a device connection :param device_serial: serial number of target device :param is_emulator: boolean, type of device, True for emulator, False for real device :return:
(self, device_serial=None, is_emulator=False, output_dir=None,
cv_mode=False, grant_perm=False, telnet_auth_token=None,
enable_accessibility_hard=False, humanoid=None, ignore_ad=False)
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