Wslay is a WebSocket library written in C. It implements the protocol
version 13 described in RFC 6455. This library offers 2 levels of API:
event-based API and frame-based low-level API.
For event-based API, it is suitable for non-blocking reactor pattern
style. You can set callbacks in various events.
For frame-based API, you can send WebSocket frame directly. Wslay only
supports data transfer part of WebSocket protocol and does not perform
opening handshake in HTTP.
