Owner's Manual

BROWAN COMMUNICATIONS INC. All rights reserved. 4
4. Messages
LoRaWAN Packets for this device use port 127
4.1 Status
4.1.1 Triggers
CO2 Sensor Packet Triggers:
● 60-minute inactivity
● CO2 > 1000 ppm
● The device will scan the environment every 10 minutes.
Button Pressed Trigger:
● Immediately send a message with Temp, RH values, and CO2 as 0 within the first 10 minutes after joining.
● Immediately send a message with Temp, RH, and CO2 values with the last time reading after joining for more
than 10 minutes.
4.1.2 Payload
Port
127
Payload Length
6 bytes
Bytes
0
1
2
3
4
5
Field
Status
Battery
Temp.
RH
CO
2
Status
Sensor status
Bits [0]
Bits [1]
Bits [2]
Bits [3]
Bits [4]
Bits [5:7]
1 – Trigger Event, 0 – Keepalive
1 – Button pressed, 0 - Button released
RFU
RFU
1 - CO2 is over the threshold (CO2 > 1200 ppm)
RFU
Battery
Battery level
Bits [3:0]
Bits [7:4]
unsigned value ν, range 0 – 15.
battery voltage in V = (21 + ν) ÷ 10.
RFU
Temp
Environment Temperature
Bits [7:0]
sign integer temperature in °C
-20~50 °C
RH
Relative humidity as measured by the digital sensor
Bits [6:0]
Bit [7]
unsigned value in %, range 0-100.
RFU
CO
2
CO2 equivalent estimate
Bits [15:0]
Estimation of the CO2 level in ppm.
*Note: little-endian format.