new feature: error code reporting

[GrKoR]

Log of mobile air conditioner. Need to verify if there are any differences with ordinary AC communication.

Logs ( 1, 2, 3 ) of ordinary AC which is operating without outdoor unit. In HEAT mode AC rises E5 error.

[GrKoR]

BTW: python logger leads ESP to reboot. Need to check it.

[GrKoR]

Portable air conditioner has nothing interesting in its logs, only device type. But the aux_ac component doesn't use this data.

[GrKoR]

Find the error reporting byte in the protocol.
Byte 29 of the CMD=0x21 has the following values:

• 0x00 - normal functioning
• 0x07 - E5 error code

Will implement this feature in upcoming releases.