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Notice:
1. It suggests that fix the length of registered packet to 21 bytes if you use Caimore's demo
software of data center and want to change the registered packet.
2. If FE is included in the data, we will take a conversion to escape it for the content of
heartbeat packet is FE. If you want to develop a data center software by yourself, please
consult our technical support stuff to get the conversion rule.
If DTU works in UDP mode, it will send a registered packet to server at first
connection. When there is no data transmitting with server during 60 seconds, DTU will
send a heartbeat packet to server to keep the connection.
The data format that DTU send to data center:
1. Default registered packet:
Starting
Type
Mark
1 byte
1 byte
0x7b
0x01
Description:
DTU Identify Code：DTU RUIM card's number, such as 13312345678
DTU IP Address：the IP address after DTU
Local Port ： XX50 and XX60 can not fix the local port, and the port is different
among each connection.
2. Default registered packet:
Xx50：
Starting
Type
Mark
1 byte
1 byte
0x7b
0x81
Under UDP mode, Xx60 does not respond the registered packet by default.
3. Default heartbeat packet:
Starting
Type
Mark
1 byte
1 byte
0x7b
0x01
Xiamen Caimore Communication Technology Co.,Ltd
Annex IV UDP Protocol
Lengt
DTU
Identify
h
Code
2
11 bytes
bytes
0x00
0x16
Length DTU
Identify
Code
2 bytes 11 bytes
0x10
Lengt
DTU
Identify
h
Code
2
11 bytes
bytes
0x16
厦 门 才 茂 通 信 科 技 有 限 公 司
DTU
IP
Local Port
Address
4 bytes
2 bytes
dial successfully
Ending
Mark
1 byte
0x7b
DTU
IP
DTU
Address
Communicati
on Port
4 bytes
2 bytes
12
Ending
Mark
1 byte
0x7b
Ending
Mark
1 byte
0x7b
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