High-Flying Electronics Technology Co. Ltd HF-A11X Manual De Usuario

HF-A11x V3.1 User Manual 

Shanghai High-Flying Electronics Technology Co., Ltd 

www.hi-flying.com 

22

{ 
 u32 

cksum=0; 

 

 

 u16 

*p=data; 

 

while (len > 1) 

 { 
   cksum 

+= 

*p++; 

   len 

-=2; 

 } 
 if 

(len) 

 { 
 

 

cksum += *(u8 *)p; 

 } 
 

cksum = (cksum >> 16) + (cksum & 0xffff); 

 

cksum += (cksum >>16); 

 return 

~cksum; 

} 

--------------------------------------------- 

1.4.3. Configuration 

Mode 

In configuration mode, user can finish HF-A11x module configuration management and 
parameters setting work. In work mode (Transparent Transmission or Agreement Transmission), 
user can switch to the configuration mode through AT+instruction, detailed switch operation refer 
to “AT+ instruction set” chapter. 

1.4.4.  Multi-TCP Link Connection 

When HF-A11x module configured as TCP Server, it supports Multi-TCP link connection, and 
maximum 32 TCP clients permit to connect to HF-A11x module. User can realize multi-TCP link 
connection at each work mode.  
 
Multi-TCP link connection will work as following structure: 
Upstream: All dates from different TCP connection or client will be transmitted to the serial port as 

a sequence. 

Downstream: All data from serial port (user) will be duplicate and broadcast to every TCP 

connection or client. 

Detailed multi-TCP link data transmition structure as following figure: 
 

 

Figure 14.  Multi-TCP Link Data Transmition Structure