Basically Xiaomi Miio is missing basic camera functionality, at least turning it off and on.
I badly needed to turn the camera on and off automatically when nobody at home and finally it seems I can do it 
$ chuangmicamera --ip 192.168.0.123 --token XXXXXXXXXXXXXXXXXXXXXXXXXXX --help
Usage: miiocli chuangmicamera [OPTIONS] COMMAND [ARGS]...
Options:
--ip TEXT [required]
--token TEXT [required]
--model TEXT
--help Show this message and exit.
Commands:
alarm Sound a loud alarm for 10 seconds.
clear_nas_dir Clear NAS directory.
flip_off Flip image 180 degrees off.
flip_on Flip image 180 degrees on.
full_color_off Full color off.
full_color_on Full color on.
get_nas_config Get NAS config info.
improve_program_off Improve program off.
improve_program_on Improve program on.
info Get (and cache) miIO protocol information...
light_off Light off.
light_on Light on.
motion_record_off Motion record off, always record video.
motion_record_on Start recording when motion detected.
motion_record_stop Motion record off, video recording stopped.
night_mode_auto Auto switch to night mode.
night_mode_off Night mode off.
night_mode_on Night mode always on.
off Power off.
on Power on.
raw_command Send a raw command to the device.
rotate Rotate camera to given direction (left,...
set_home_monitoring_config Set home monitoring configuration.
set_motion_sensitivity Set motion sensitivity (high, low).
set_nas_config Set NAS configuration.
status Retrieve properties.
test_properties Helper to test device properties.
watermark_off Watermark off.
watermark_on Watermark on.
wdr_off Wide dynamic range off.
wdr_on Wide dynamic range on.
$ chuangmicamera --ip 192.168.0.123 --token XXXXXXXXXXXXXXXXXXXXXXXXXXX on
Power on
['OK']
$ chuangmicamera --ip 192.168.0.123 --token XXXXXXXXXXXXXXXXXXXXXXXXXXX off
Power off
['OK']
In case anyone is looking on how to setup - edit configuration.yaml file like this:
switch:
- platform: command_line
switches:
xiaomi_camera:
command_on: "miiocli chuangmicamera --ip 192.168.0.123 --token XXXXXXXXXXXXXXXXXXXXXXXXXXX on"
command_off: "miiocli chuangmicamera --ip 192.168.0.123 --token XXXXXXXXXXXXXXXXXXXXXXXXXXX off"
command_state: "miiocli chuangmicamera --ip 192.168.0.123 --token XXXXXXXXXXXXXXXXXXXXXXXXXXX status | grep -q 'Power: True'"
command_timeout: 5
friendly_name: "Xiaomi Mi Home Security 360"
miiocli should be installed (installed by default in docker container). Works like a charm.