In the following documentation for MATLAB 7.7 (R2008b), it is stated that "ext_tcpip_transport.c" can be found under:
matlabroot/rtw/ext_mode/tcpip/
(web([docroot '/toolbox/rtw/ug/f25250.html']))
However this directory does not exist.
directorydocumentationext_modeext_tcpip_transport.cmissingr2008bsimulink codertcpip
(web([docroot '/toolbox/rtw/ug/f25250.html']))
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