indi_alpaca_focuser.h

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/*
    INDI alpaca Focuser Driver
 
    Copyright (C) 2024 Gord Tulloch
 
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.
 
    This library 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
    Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
*/
 
#pragma once
 
#include <indifocuser.h>
#include <connectionplugins/connectiontcp.h>
#include <memory>
#include <string>
 
#define HTTPLIB_NO_EXCEPTIONS
#include "httplib.h"
 
#ifdef _USE_SYSTEM_JSONLIB
#include <nlohmann/json.hpp>
#else
#include <indijson.hpp>
#endif
 
class AlpacaFocuser : public INDI::Focuser
{
    public:
        AlpacaFocuser();
        virtual ~AlpacaFocuser();
 
        virtual const char *getDefaultName() override;
        virtual bool initProperties() override;
        virtual bool updateProperties() override;
 
        virtual bool Connect() override;
        virtual bool Disconnect() override;
        virtual bool Handshake() override;
 
        virtual bool ISNewText(const char *dev, const char *name, char *texts[], char *names[], int n) override;
        virtual bool ISNewSwitch(const char *dev, const char *name, ISState *states, char *names[], int n) override;
 
    protected:
        // Focuser interface
        virtual IPState MoveAbsFocuser(uint32_t targetTicks) override;
        virtual bool AbortFocuser() override;
        virtual void TimerHit() override;
 
    private:
        // Device info properties
        INDI::PropertyText DeviceInfoTP {4};
        enum { DESCRIPTION, DRIVER_INFO, DRIVER_VERSION, INTERFACE_VERSION };
 
        // Temperature property
        INDI::PropertyNumber TemperatureNP {1};
 
        // Temperature compensation switch (only defined if the device reports tempcompavailable=true)
        INDI::PropertySwitch TempCompSP {2};
        enum { TEMP_COMP_ENABLE, TEMP_COMP_DISABLE };
        bool m_TempCompAvailable = false;
 
        // Alpaca communication
        std::unique_ptr<httplib::Client> m_AlpacaClient;
        std::string m_Host = "alpaca.local";
        int m_Port = 32323;
        int m_DeviceNumber = 0;
        uint32_t m_ClientID = 1;
        uint32_t m_TransactionID = 0;
 
        // Movement state
        uint32_t m_TargetPosition = 0;
        bool m_Moving = false;
 
        // Helper methods
        bool setupFocuser();
        bool isMoving();
        int getPosition();
        bool sendAlpacaGET(const std::string &endpoint, nlohmann::json &response);
        bool sendAlpacaPUT(const std::string &endpoint, const std::string &data, nlohmann::json &response);
};