Fix read_status failure for multiple statuses after actions

[huangruoqi]

Summary

This PR fixes an issue where read_status() could fail due to multiple status data when using reader.read(). The updated implementation uses reader.readexactly() to ensure the AES-encrypted payload is fully and correctly received before decryption.

Problem

Previously, read_status() used:

data = await self.reader.read(1024)

Using this test script

cl = DeviceClient(device, user_info)

await cl.connect("10.0.0.250")
for i in range(6):
    await asyncio.sleep(0.5)
    await cl.async_set_brightness(i * 50)

for i in range(1 + 6*2):
    print((await cl.read_status()).__dict__)

causes:

recv json error : The length of the provided data is not a multiple of the block length.
recv json error : The length of the provided data is not a multiple of the block length.
recv json error : The length of the provided data is not a multiple of the block length.
recv json error : 'utf-8' codec can't decode byte 0xd0 in position 1: invalid continuation byte
{'online': True, 'on': 1, 'dimming': 147, 'rgdb': -4422400, 'rgbw': (255, 188, 133, 0)}
{'online': True, 'on': 1, 'dimming': 249, 'rgdb': -4422400, 'rgbw': (255, 188, 133, 0)}
^C
KeyboardInterrupt
>>>
KeyboardInterrupt

This was unsafe because AES requires a block-aligned input; partial data causes decryption errors. This led to errors like:

• The length of the provided data is not a multiple of the block length
• utf-8 decode error: invalid continuation byte

Changes

Replaced read() with readexactly(8) for the header and readexactly(bodysize) for the encrypted payload in read_status().

Testing

Reran the test script:

{'online': True, 'on': 1, 'dimming': 249, 'rgdb': -4422400, 'rgbw': (255, 188, 133, 0)}
{'online': True, 'on': 1, 'dimming': 249, 'rgdb': -4422400, 'rgbw': (255, 188, 133, 0)}
{'online': True, 'on': 1, 'dimming': 0, 'rgdb': -4422400, 'rgbw': (255, 188, 133, 0)}
{'online': True, 'on': 1, 'dimming': 0, 'rgdb': -4422400, 'rgbw': (255, 188, 133, 0)}
{'online': True, 'on': 1, 'dimming': 48, 'rgdb': -4422400, 'rgbw': (255, 188, 133, 0)}
{'online': True, 'on': 1, 'dimming': 48, 'rgdb': -4422400, 'rgbw': (255, 188, 133, 0)}
{'online': True, 'on': 1, 'dimming': 99, 'rgdb': -4422400, 'rgbw': (255, 188, 133, 0)}
{'online': True, 'on': 1, 'dimming': 99, 'rgdb': -4422400, 'rgbw': (255, 188, 133, 0)}
{'online': True, 'on': 1, 'dimming': 147, 'rgdb': -4422400, 'rgbw': (255, 188, 133, 0)}
{'online': True, 'on': 1, 'dimming': 147, 'rgdb': -4422400, 'rgbw': (255, 188, 133, 0)}
{'online': True, 'on': 1, 'dimming': 198, 'rgdb': -4422400, 'rgbw': (255, 188, 133, 0)}
{'online': True, 'on': 1, 'dimming': 198, 'rgdb': -4422400, 'rgbw': (255, 188, 133, 0)}
{'online': True, 'on': 1, 'dimming': 249, 'rgdb': -4422400, 'rgbw': (255, 188, 133, 0)}