Method onStarted

tests/test_proto.cpp:102–102

protected:
    void onStarted() override { started = true; }
    void onStopped() override { stopped = true; }
    void onConnected(std::shared_ptr<TCPSession>& session) override { connected = true; ++clients; }
    void onDisconnected(std::shared_ptr<TCPSession>& session) override { disconnected = true; --clients; }