Research and Design of Distributed IoT Water Environment Monitoring System Based on LoRa

Table 1

Data frame protocol.

Byte	Character	Meaning
Byte[0]	0x40	Data frame header
Byte [1]	ID	LoRa node ID
Byte [2]	Data	7-4 bit: integer part of water temperature; 3-0 bit: decimal part of water temperature
Byte [3]	Data	7-4 bit: pH integer part; 3-0bit: pH decimal part
Byte [4]	Data	7-4 bit: integer part of turbidity; 3-0 bit: decimal part of turbidity
Byte [5]	Data	7-4 bit: integer part of conductivity; 3-0 bit: decimal part of conductivity
Byte [6]	Data	7-4 bit: integer part of longitude; 3-0 bit: decimal part of longitude
Byte [7]	Data	7-4 bit: integer part of latitude; 3-0 bit: decimal part of latitude
Byte [8]	0x35	Data frame tail