What is BSD socket interface and how does it work?

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A socket is an endpoint of communication. It is the basic building block for communication. A MODBUS communication is executed by sending and receiving data through sockets. The TCP/IP library provides only stream sockets using TCP and providing a connection-based communication service.
It contains several features that:

socket ()

bind ()

connect ()

accept ()

listen ()

send ()

recv ()

setsockopt ()

select ()

shutdown ()

close ()

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