server_plugin_helper_example.rb

      server_create(:title, proto: :tcp, port: @port, connection_callback: true) do |conn|
        # on connection
        source_addr = conn.addr
        source_port = conn.port

        conn.data do |data|
          # on data
          conn.write resp # ...
          conn.disconnect
        end
      end

      server_create(:title, proto: :tcp, port: @port, shared: false) do |data|
        # ...
      end

      server_create(:title, port: @port) do |data, conn| # tcp, shared, callback_type: :data
        # ...
        conn.write resp
      end

      # udp...
      server_create(:title, proto: :udp, port: @port, max_size: 1024) do |data, addr, sock|
        # ...
        sock.write resp, flag, addr
      end

      server_create(:title, proto: :udp, port: @port, max_size: 1024) do |data, addr|
        # ...
      end

      server_create(:title, proto: :udp, port: @port, max_size: 1024) do |data|
        # ...
      end

      # tls certificate check?
      server_create(:title, proto: :tls, port: @port, certs: certs_object, connection_callback: true) do |conn|
        # ...
      end