Air humidifer CA4 returns command error

[marek-obuchowicz]

Describe the bug
Air humidifer CA4 status returns command error

Version information (please complete the following information):

• OS: OS X Big Sur, x86_64
• python-miio: 0.5.5.2

Device information:

Hardware version: esp32
Firmware version: 2.0.8```

**To Reproduce**
Steps to reproduce the behavior:
```miiocli airhumidifier --ip ... --token ... status
Error: {'code': -5001, 'message': 'command error'}

(same problem with other commands, like set_led, off, on)

Expected behavior
As this device should be supported, i expect status and other commands to work.

Console output

miiocli --debug airhumidifier --ip ... --token ... status
INFO:miio.cli:Debug mode active
DEBUG:miio.protocol:Unable to decrypt, returning raw bytes: b''
DEBUG:miio.miioprotocol:Got a response: Container:
    data = Container:
        data = b'' (total 0)
        value = b'' (total 0)
        offset1 = 32
        offset2 = 32
        length = 0
    header = Container:
        data = b'!1\x00 \x00\x00\x00\x00\x15]\xf8$\x00\x00\x11\xe5' (total 16)
        value = Container:
            length = 32
            unknown = 0
            device_id = unhexlify('155df824')
            ts = 1970-01-01 01:16:21
        offset1 = 0
        offset2 = 16
        length = 16
    checksum = b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff' (total 16)
DEBUG:miio.miioprotocol:Discovered 155df824 with ts: 1970-01-01 01:16:21, token: b'ffffffffffffffffffffffffffffffff'
DEBUG:miio.miioprotocol:*.*.*.*:54321 >>: {'id': 1, 'method': 'miIO.info', 'params': []}
DEBUG:miio.miioprotocol:*.*.*.*:54321 (ts: 1970-01-01 01:16:22, id: 1) << {'id': 1, 'result': {'life': 4581, 'uid': 6449165217, 'model': 'zhimi.humidifier.ca4', 'token': '*', 'ipflag': 1, 'fw_ver': '2.0.8', 'mcu_fw_ver': '0017', 'miio_ver': '0.0.8', 'hw_ver': 'esp32', 'mmfree': 65244, 'mac': '54:48:E6:50:1E:B9', 'wifi_fw_ver': 'cef6c09-dirty', 'ap': {'ssid': '*', 'bssid': '*', 'rssi': -52, 'primary': 4}, 'netif': {'localIp': '*.*.*.*', 'mask': '255.255.255.0', 'gw': '*.*.*.*'}}, 'exe_time': 40}
DEBUG:miio.miioprotocol:*.*.*.*:54321 >>: {'id': 2, 'method': 'get_prop', 'params': ['power', 'mode', 'humidity', 'buzzer', 'led_b', 'child_lock', 'limit_hum', 'use_time', 'hw_version', 'temp_dec', 'trans_level', 'button_pressed']}
DEBUG:miio.miioprotocol:*.*.*.*:54321 (ts: 1970-01-01 01:16:22, id: 2) << {'id': 2, 'error': {'code': -5001, 'message': 'command error'}, 'exe_time': 80}
DEBUG:miio.click_common:Exception: {'code': -5001, 'message': 'command error'}
Traceback (most recent call last):
  File "/usr/local/lib/python3.9/site-packages/miio/click_common.py", line 59, in __call__
    return self.main(*args, **kwargs)
  File "/usr/local/lib/python3.9/site-packages/click/core.py", line 782, in main
    rv = self.invoke(ctx)
  File "/usr/local/lib/python3.9/site-packages/click/core.py", line 1259, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/local/lib/python3.9/site-packages/click/core.py", line 1259, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/local/lib/python3.9/site-packages/click/core.py", line 1066, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/local/lib/python3.9/site-packages/click/core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "/usr/local/lib/python3.9/site-packages/miio/click_common.py", line 280, in wrap
    kwargs["result"] = func(*args, **kwargs)
  File "/usr/local/lib/python3.9/site-packages/click/decorators.py", line 73, in new_func
    return ctx.invoke(f, obj, *args, **kwargs)
  File "/usr/local/lib/python3.9/site-packages/click/core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "/usr/local/lib/python3.9/site-packages/miio/click_common.py", line 245, in command_callback
    return miio_command.call(miio_device, *args, **kwargs)
  File "/usr/local/lib/python3.9/site-packages/miio/click_common.py", line 193, in call
    return method(*args, **kwargs)
  File "/usr/local/lib/python3.9/site-packages/miio/airhumidifier.py", line 285, in status
    values = self.get_properties(properties, max_properties=_props_per_request)
  File "/usr/local/lib/python3.9/site-packages/miio/device.py", line 268, in get_properties
    values.extend(self.send(property_getter, _props[:max_properties]))
  File "/usr/local/lib/python3.9/site-packages/miio/device.py", line 177, in send
    return self._protocol.send(
  File "/usr/local/lib/python3.9/site-packages/miio/miioprotocol.py", line 214, in send
    self._handle_error(payload["error"])
  File "/usr/local/lib/python3.9/site-packages/miio/miioprotocol.py", line 274, in _handle_error
    raise DeviceError(error)
miio.exceptions.DeviceError: {'code': -5001, 'message': 'command error'}
Error: {'code': -5001, 'message': 'command error'}```

[rytilahti]

The cli can sometimes be confusing (esp. related to which command to use), sorry for that! For the CA4, the correct command is miiocli airhumidifiermiot (ca4 being mentioned in airhumidifier_miot.py).