alpaca_discovery.h

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/*******************************************************************************
  Copyright(c) 2025 Jasem Mutlaq. All rights reserved.
 
  INDI Alpaca Discovery Protocol
 
  This program is free software; you can redistribute it and/or modify it
  under the terms of the GNU General Public License as published by the Free
  Software Foundation; either version 2 of the License, or (at your option)
  any later version.
 
  This program is distributed in the hope that it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  more details.
 
  You should have received a copy of the GNU Library General Public License
  along with this library; see the file COPYING.LIB.  If not, write to
  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  Boston, MA 02110-1301, USA.
 
  The full GNU General Public License is included in this distribution in the
  file called LICENSE.
*******************************************************************************/
 
#pragma once
 
#include <string>
#include <thread>
#include <atomic>
#include <memory>
#include <vector>
#include <sys/socket.h>
#include <netinet/in.h>
 
class AlpacaDiscovery
{
    public:
        AlpacaDiscovery(int discoveryPort = 32227, int alpacaPort = 11111);
 
        ~AlpacaDiscovery();
 
        bool start();
 
        bool stop();
 
        bool isRunning() const;
 
        void setDiscoveryPort(int port);
 
        int getDiscoveryPort() const;
 
        void setAlpacaPort(int port);
 
        int getAlpacaPort() const;
 
    private:
        void discoveryThreadFunc();
 
        int createIPv4Socket();
 
        int createIPv6Socket();
 
        void processDiscoveryRequest(int socket, const char* buffer, size_t length,
                                     const struct sockaddr* senderAddr, socklen_t senderAddrLen);
 
        void sendDiscoveryResponse(int socket, const struct sockaddr* senderAddr, socklen_t senderAddrLen);
 
        std::string generateResponseMessage() const;
 
        // Configuration
        int m_DiscoveryPort;
        int m_AlpacaPort;
 
        // Thread management
        std::thread m_DiscoveryThread;
        std::atomic<bool> m_Running;
        std::atomic<bool> m_StopRequested;
 
        // Socket file descriptors
        std::vector<int> m_Sockets;
};