Method on_connection_open

cpp/examples/connection_options.cpp:34–39

class handler_2 : public proton::messaging_handler {
    void on_connection_open(proton::connection &c) override {
        std::cout << "connection events going to handler_2" << std::endl;
        std::cout << "connection max_frame_size: " << c.max_frame_size() <<
            ", idle timeout: " << c.idle_timeout() << std::endl;
        c.close();
    }
};

class main_handler : public proton::messaging_handler {