Ping from server shutting down the connection

[A320Peter]

I am new to WebSocket and Swift, and there is a high chance that I am wrong.

I communicate with a WebSocket server that randomly sends ping as an Opcode frame to the client and expects a pong. The connection is closed immediately because the incoming ping is incorrectly handled as an unknown message. After all, the incoming Opcode has context but no data and no error; therefore, it lands in the handleUknownMessage method followed by connection close.

The following temporarily solved my problem, but I doubt it's the correct way to do it. It might help somebody to do it the right way.

Necessary update on the WebSocketMessage: