(0x5B) Extended Connect Request

Appears to be a request for information about the device on the other side as part of auto-configuration. Sent by the thermostat to the heat pump/Kumo unit. A response is expected in the form of a (0x7B) Extended Connect Response packet.

Byte	Purpose	Possible Values	Supported by mUART	Notes
0	CommandType?	0xC9