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: Binary

Combined Configuration Packet

Length: 3 bytes Format: [heating_enable][room_temp_threshold][floor_temp_threshold]

Byte	Field	Type	Range	Description
0	Heating Enable	uint8_t	0-1	Heating control logic (0=DISABLED, 1=ENABLED)
1	Room Temperature Threshold	uint8_t	0-255	Target room temperature in °C
2	Floor Temperature Threshold	uint8_t	0-255	Target floor temperature in °C

Examples:

01 16 19 = Enable heating, room 22°C, floor 25°C
00 14 18 = Disable heating, room 20°C, floor 24°C

Send Interval Command

Length: 2 bytes Format: 'i'[interval_minutes]

Byte	Field	Type	Range	Description
0	Command	ASCII	'i' (0x69)	Send interval command identifier
1	Interval	uint8_t	1-255	Send interval in minutes

Examples:

69 05 = Set send interval to 5 minutes
69 3C = Set send interval to 60 minutes

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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