AttributeError: 'DevInfoResponse' object has no attribute 'info'

[sclaes]

Python 3.8.10 (default, Nov 26 2021, 20:14:08)
[GCC 9.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.

import elitech
device = elitech.Device("/dev/ttyUSB0")
device
<elitech.Device object at 0x7faea38b9a30>
devinfo = device.get_devinfo()
devinfo
<elitech.msg.DevInfoResponse object at 0x7faea378e400>
print(devinfo.info)
Traceback (most recent call last):
File "", line 1, in
AttributeError: 'DevInfoResponse' object has no attribute 'info'
print(devinfo.model_no)
50
print(devinfo.station_no)
1
print(devinfo.rec_count)
0
print(devinfo.start_time)
None

device.debug=True
body=device.get_data()
body
[]
print(devinfo.info)
Traceback (most recent call last):
File "", line 1, in
AttributeError: 'DevInfoResponse' object has no attribute 'info'
print(device.encode)
utf8
print(device.get_devinfo)
<bound method Device.get_devinfo of <elitech.Device object at 0x7fe1ed9aca30>>
device.get_devinfo()

ba length=5
CC 00 06 00 D2
<elitech.msg.DevInfoResponse object at 0x7fe1ed8a0ca0>

$ elitech-datareader --command simple-set --interval=10 /dev/ttyUSB0
$ elitech-datareader --command get /dev/ttyUSB0
$ elitech-datareader --command latest /dev/ttyUSB0
$ elitech-datareader --command devinfo --encode=utf8 /dev/ttyUSB0
alarm=AlarmSetting.NONE
current=2022-02-16 16:35:12
delay=0.0
dev_num=E187109805
humi_calibration=0.0
humi_lower_limit=0.0
humi_upper_limit=0.0
last_online=2022-02-16 16:33:34
lower_limit=-30.0
model_no=50
rec_count=0
rec_interval=00:00:10
start_time=None
station_no=1
stop_button=StopButton.DISABLE
temp_calibration=0.0
temp_unit=TemperatureUnit.C
tone_set=ToneSet.NONE
upper_limit=60.0
user_info=RC-5 Data Logger
work_sts=WorkStatus.NOT_START
$ elitech-datareader --command get --page_size=500 /dev/ttyUSB0
Traceback (most recent call last):
File "/home/sclaes/.local/bin/elitech-datareader", line 8, in
sys.exit(main())
File "/home/sclaes/.local/lib/python3.8/site-packages/scripts/elitech_device.py", line 23, in main
command_get(args)
File "/home/sclaes/.local/lib/python3.8/site-packages/scripts/elitech_device.py", line 66, in command_get
device.get_data(callback=output, page_size=args.page_size)
File "/home/sclaes/.local/lib/python3.8/site-packages/elitech/init.py", line 136, in get_data
page = int(math.ceil(header.rec_count * data_size / float(page_size)))
UnboundLocalError: local variable 'data_size' referenced before assignment

Why is the attribute devinfo.info not defined? BTW: is there a tutorial? I got all the above from the source code...
BTW: How do I start recording? I set devinfo.start_time to 'now' but that doesn't make a difference. Neither does pressing the start button on the device (devinfo.rec_count stays 0). The device displays (a.o.) the temperature, so I assume it is working.

[sclaes]

I found out I had to press and hold to start logging. I should have read the fine manual... :-/

The other problems/error are still not resolved but at least I can now use the device to log the temperature. I thought it also could log the humidity but it can't. I need a different logger for that.