net: Implement send_message on DMLSession

include/ki/protocol/control/Opcode.h

@@ -9,6 +9,7 @@ namespace control
 {
 	enum class Opcode : uint8_t
 	{
+		NONE = 0,
 		SERVER_HELLO = 0,
 		UDP_HELLO = 1,
 		PING = 3,

include/ki/protocol/net/DMLSession.h

@@ -14,6 +14,8 @@ namespace net
 		DMLSession(ParticipantType type, uint16_t id,
 			const dml::MessageManager &manager);
 		~DMLSession() = default;
+
+		void send_message(const dml::Message &message);
 	protected:
 		void on_application_message(const PacketHeader& header) override;
 		virtual void on_message(const dml::Message &message) {}

src/protocol/net/DMLSession.cpp

@@ -10,6 +10,11 @@ namespace net
 		const dml::MessageManager& manager)
 		: Session(type, id), m_manager(manager) {}
 
+	void DMLSession::send_message(const dml::Message& message)
+	{
+		send_packet(false, control::Opcode::NONE, message);
+	}
+
 	void DMLSession::on_application_message(const PacketHeader& header)
 	{
 		const auto *message = m_manager.message_from_binary(m_data_stream);