mongoose/docs/c-api/net.h/mg_add_sock.md

title	decl_name	symbol_kind	signature
mg_add_sock()	mg_add_sock	func	struct mg_connection *mg_add_sock(struct mg_mgr *mgr, sock_t sock, MG_CB(mg_event_handler_t handler, void *user_data);

Creates a connection, associates it with the given socket and event handler and adds it to the manager.

For more options see the mg_add_sock_opt variant.