telem_client.h

#ifndef _TELEM_CLIENT_H
#define _TELEM_CLIENT_H

#pragma GCC diagnostic push
#if defined(__GNUC__) && __GNUC__ >= 9
#pragma GCC diagnostic ignored "-Waddress-of-packed-member"
#endif
#pragma GCC diagnostic ignored "-Wpedantic"
#include "mavlink_c_library/ardupilotmega/mavlink.h"
#pragma GCC diagnostic pop

#ifdef _WIN32
#include "Winsock2.h"
#else
#include <sys/select.h>
#endif

#include "INIReader.h"

class Telem_Client {
public:
    Telem_Client() { }

    virtual void pack_select_fds(fd_set &fds_read, fd_set &fds_write, fd_set &fds_err, uint8_t &nfds) = 0;
    virtual void configure(INIReader *config) = 0;
    virtual void handle_select_fds(fd_set &fds_read, fd_set &fds_write, fd_set &fds_err, uint8_t &nfds) = 0;

    virtual void init() { }

    virtual void do_writer_sends() = 0;
    virtual bool send_message(const mavlink_message_t &message) = 0;
    virtual bool any_data_to_send() = 0;

    virtual uint32_t send_buffer_space_free();
    virtual uint32_t send_buffer_used();

    uint32_t _send_buf_start = 0;
    uint32_t _send_buf_stop = 0;

    // FIXME: scope
    uint8_t _recv_buf[512]; // receive buffer
    const uint32_t _recv_buflen = sizeof(_recv_buf); // receive buffer len
    int32_t _recv_buflen_content = 0;

    virtual uint32_t send_buf_size() const = 0;

private:

};

#endif