udpip

Simulink Blocks for UDP/IP communication

Description

These two blocks allow exchanging data bytes via an UDP/IP connection between simulink schemes running possibly as different processes on different (windows) machines.
  
  Differently from the TCP/IP protocol, UDP/IP is totally asyncronous and non-blocking thus allowing in general a faster communication. Additionally, the client and server can be started or stopped in any order, as opposite to the TCP/IP case, where the server must always be started before the client is started and stopped after the client is stopped.

  Finally, note that you can use the "byteview" block, available under
  MATLAB Central > File Exchange > Utilities > Simulink, to transform any simulink data type into bytes (aka uint8) and back.

The C code for both the sender (client) and the receiver (server) is included in the zip file.

• Required Products: Simulink
• MATLAB release: MATLAB 5.3 (R11)
• Other requirements: Win32 platform required (e.g. Vista, WinXP, Win2K, Wine ...)

[Steven Kolak]

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Simulink now supports UDP communication with Simulink blocks provided in the Instrument Control Toolbox.

These client blocks enable Simulink models to communicate with remote applications over UDP.

Visit the Simulink UDP web page for more information:
http://www.mathworks.com/udp

[Jaganathan Ranganathan]

Hi,

I'm trying to receive data from a specific ip address but when i used your udprecv algorithm, I'm not receiving any datas. It seems like it is not binding the data. Can you help me, how to receive the data.

[Matt]

There is an error in the code of SimUdpServer3.c
In function mdlOutputs, the variable req_len is declared but never initialized or subsequently set to any value. Just before switch(info->connState), a line like:
req_len = sizeof(struct sockaddr_in);
needs to be added. Otherwise the recvfrom function will fail every time and you won't get any data.