Sockets are the standard way to access transport-layer communication from network applications. The Berkeley socket model, later standardized by POSIX, includes a naming standard for functions and components, and the behavior in a UNIX operating system. If the TCP/IP stack is integrated in the operating system, the scheduler can provide a mechanism to suspend the caller while waiting for a specific input, and the socket call API can be implemented to match POSIX specifications. In a bare-metal event-based application, however, the synchronization with the sockets is done using callbacks, as previously mentioned, in order to follow the event-based model of the main loop.
The interface provided by lwIP for bare-metal socket ...
