in chime-sdk-signaling-cpp/src/transport/websocket_signaling_transport.cc [88:94]
void WebsocketSignalingTransport::OnWebsocketClosed(WebsocketStatus status) {
is_stopped_ = true;
SignalingCloseEvent event {};
event.description = status.description;
event.code = SignalingCloseCode::kOK;
observer_->OnSignalingClosed(event);
}