Added code.

server/src/include/chat.h

@@ -0,0 +1,25 @@
+#ifndef CHAT_H
+#define CHAT_H
+
+#include <libwebsockets.h>
+
+/**
+ * cb_chat - libwebsockets protocol callback for COMS chat.
+ *
+ * This function is registered in the protocols array passed to the
+ * lws_context and handles connection, receive, writable, and close events.
+ *
+ * @wsi:    The WebSocket instance pointer
+ * @reason: One of the LWS_CALLBACK_* reasons
+ * @user:   Pointer to a session_t* for this connection
+ * @in:     Pointer to incoming data (for receive events)
+ * @len:    Length of the incoming data buffer
+ *
+ * Return: 0 on success, non-zero on error.
+ */
+int cb_chat(
+    struct lws* wsi, enum lws_callback_reasons reason, void* user, void* in,
+    size_t len
+);
+
+#endif // CHAT_H