Method onSend

tests/test_proto.cpp:53–53

    void onConnected() override { connected = true; }
    void onDisconnected() override { disconnected = true; }
    size_t onSend(const void* data, size_t size) override { return SendAsync(data, size) ? size : 0; }
    void onReceived(const void* buffer, size_t size) override { receive(buffer, size); }
    void onError(int error, const std::string& category, const std::string& message) override { errors = true; }