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udpip

21 Aug 2006 (Updated 01 Apr 2009)

Simulink Blocks for UDP/IP communication

File Information
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 ...)
Zip File Content
Other Files	udpip/Readme.txt, udpip/SimUdpClient3.c, udpip/SimUdpClient3.dll, udpip/SimUdpClient3.mexw32, udpip/SimUdpServer3.c, udpip/SimUdpServer3.dll, udpip/SimUdpServer3.mexw32, udpip/udprecv.mdl, udpip/udpsend.mdl

Tags for This File
Everyone's Tags	asyncronous, communication, ethernet, interproc, ip, network, simulink, tcp, udp
Tags I've Applied
Add New Tags	Please login to tag files.

Comments and Ratings (3)
05 Jan 2007	Steven Kolak	_ 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
27 Jul 2008	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.
13 Feb 2009	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.

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Updates
23 Oct 2007	Recompiled the s-functions with matlab 7.1 so that everything works fine with newer versions requiring the .mexw32 extension. The .dll files are retained to the benefit of users working with versions prior to 7.1, other users may delete them.
01 Apr 2009	I've inserted the line: req_len = sizeof(struct sockaddr_in); in SimUdpServer3.c (Thanks Matt).

Tag Activity for this File
Tag	Applied By	Date/Time
simulink	Giampiero Campa	22 Oct 2008 08:35:26
udp	Giampiero Campa	22 Oct 2008 08:35:26
ip	Giampiero Campa	22 Oct 2008 08:35:26
tcp	Giampiero Campa	22 Oct 2008 08:35:26
network	Giampiero Campa	22 Oct 2008 08:35:26
ethernet	Giampiero Campa	22 Oct 2008 08:35:26
communication	Giampiero Campa	22 Oct 2008 08:35:26
asyncronous	Giampiero Campa	22 Oct 2008 08:35:26
interproc	Giampiero Campa	22 Oct 2008 08:35:26

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