LoRaWAN Payload Description - Raumsensor Device

Uplink Payload (Device → Network Server)

Port: 2 Length: 7 bytes Format: Binary

Byte	Field	Type	Unit	Description
0-1	Room Temperature	int16_t	0.01°C	SHT4x sensor reading (big-endian)
2-3	Floor Temperature	int16_t	0.01°C	MLX90614 IR sensor reading (big-endian) *
4-5	Humidity	int16_t	0.01%	SHT4x sensor reading (big-endian)
6	Relay State	uint8_t	-	Current relay status (0=OFF, 1=ON)

Example Uplink:

08 34 0A 28 15 E0 01 = 21.00°C room, 26.00°C floor, 56.00% humidity, relay ON

Downlink Payload (Network Server → Device)

Port: Any Format: ASCII commands

Relay Control Commands

Command	Length	Format	Description
`r1 0`	4 bytes	ASCII	Force relay OFF + disable auto control
`r1 1`	4 bytes	ASCII	Re-enable automatic temperature control

Temperature Threshold Commands

Command	Length	Format	Description
`t1[temp]`	3 bytes	ASCII + uint8	Set room temperature threshold (°C)
`t2[temp]`	3 bytes	ASCII + uint8	Set floor temperature threshold (°C)

Examples:

72 31 20 30 (r1 0) = Force relay OFF
72 31 20 31 (r1 1) = Enable auto control
74 31 16 (t1 + 22) = Set room threshold to 22°C
74 32 1A (t2 + 26) = Set floor threshold to 26°C

Data Conversion

Temperature: value = (int16_t)(temperature * 100)
Humidity: value = (int16_t)(humidity * 100)
Decoding: actual_value = received_value / 100.0

Special Cases

* Floor Temperature Sensor: If the MLX90614 sensor is not available or not responding, the floor temperature will be transmitted as -273.15°C (hex: 95 5D).

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