0002: External Sensor

Description:	Request or return the temperature from an external sensor. This command appears to have other uses which are still to be fully documented
Examples:	RQ --- HGI CTL --:------ 0002 001 00
	RP --- CTL HGI --:------ 0002 004 007FFF01
	I --- TRV --:------ TRV 0002 004 007FFF01
	I --- HGI --:------ HGI 0002 008 0000000202045601

Payload decode:
Unknown	[0:2]
Temperature	[2:6]	degrees C
Unknown	[6:8]
Unknown	[8:12]

Using Python, the payload can be decoded as:

def _temp(seqx) -> Optional[float]:
    if seqx == "7FFF":
        return None
    temp = int(seqx, 16)
    return (temp if temp < 2 ** 15 else temp - 2 ** 16) / 100

def parser_1290(payload) -> dict:
    assert payload[:2] == "00"

    return {"temperature": _temp(payload[2:6])}

Related Packets

• 0x0002: Outside Sensor