TimeoutError at the test.py with CC2652 Chip

[cloudlakecho]

I try to run test.py code with the CC2652 Chip (CC2652R1) in Texas Instrument LaunchPad development kit.

I have /dev/ttyACM0 and /dev/ttyACM1, so I modify the CONF_DEVICE_PATH as /dev/ttyACM0 followed the Port configuration in the Read Me file. When I execute test.py code, it gave me the TimeoutError. Should I increase the waiting time or do I miss other settings?

Here is my runtime error:

/zigpy-cc$ python test.py
asyncio DEBUG Using selector: EpollSelector
__main__ INFO STARTUP
zigpy_cc.zigbee.application INFO Starting zigpy-cc version: 0.5.2
zigpy_cc.uart DEBUG Connecting on port /dev/ttyACM0 with boudrate 115200
zigpy_cc.uart DEBUG Connection made
zigpy_cc.api DEBUG --> SREQ SYS ping tsn: None {'capabilities': 1}
zigpy_cc.uart DEBUG Send: b'\xfe\x00!\x01 '
Traceback (most recent call last):
  File "test.py", line 101, in <module>
    loop.run_until_complete(main())
  File "/home/ccho/anaconda3/envs/radec_finger_print_one/lib/python3.7/asyncio/base_events.py", line 587, in run_until_complete
    return future.result()
  File "test.py", line 95, in main
    await app.startup(auto_form=True)
  File "/home/ccho/project/zigpy-cc/zigpy_cc/zigbee/application.py", line 113, in startup
    await self._api.request(Subsystem.SYS, "ping", {"capabilities": 1})
  File "/home/ccho/project/zigpy-cc/zigpy_cc/api.py", line 129, in request
    return await self.request_raw(obj, waiter_id, expected_status)
  File "/home/ccho/project/zigpy-cc/zigpy_cc/api.py", line 133, in request_raw
    return await self._request_raw(obj, waiter_id, expected_status)
  File "/home/ccho/project/zigpy-cc/zigpy_cc/api.py", line 156, in _request_raw
    result = await waiter.wait()
  File "/home/ccho/project/zigpy-cc/zigpy_cc/api.py", line 59, in wait
    return await asyncio.wait_for(self.future, self.timeout / 1000)
  File "/home/ccho/anaconda3/envs/radec_finger_print_one/lib/python3.7/asyncio/tasks.py", line 449, in wait_for
    raise futures.TimeoutError()
concurrent.futures._base.TimeoutError

My runtime environment:
   OS: Ubuntu 18.04
   HW: CC2652R1 (Texas Instrument LaunchPad CC2642R1/CC2652R1 development kit)

By the way, is there a comprehensive "How to" web source for the Zigpy (or Zigpy-cc)? I just want to generate some radio signal using the CC2652 chip with the Zigpy-cc tool.

Thanks.