netadapt.cpp

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// Copyright (C) 2026 Douglas Quigg (dstroy0) <dquigg123@gmail.com>
// SPDX-License-Identifier: AGPL-3.0-or-later
 
/**
 * @file netadapt.cpp
 * @brief Network adaptation decision core (see netadapt.h).
 */
 
#include "services/net/netadapt/netadapt.h"
 
#if PC_ENABLE_NETADAPT
 
uint32_t pc_netadapt_window(uint32_t free_heap, uint32_t reserve, uint32_t min_win, uint32_t max_win)
{
    uint32_t ceil_win = max_win < min_win ? min_win : max_win;
    if (free_heap <= reserve)
    {
        return min_win; // no spare heap: stay at the floor
    }
 
    // A quarter of the heap above the reserve - leaves headroom for TX buffers, TLS, app state.
    uint32_t win = (free_heap - reserve) / 4;
    if (win < min_win)
    {
        win = min_win;
    }
    if (win > ceil_win)
    {
        win = ceil_win;
    }
    return win;
}
 
bool pc_netadapt_dhcp_fallback(uint32_t elapsed_ms, uint32_t attempts, uint32_t timeout_ms, uint32_t max_attempts)
{
    if (elapsed_ms >= timeout_ms)
    {
        return true;
    }
    if (max_attempts > 0 && attempts >= max_attempts)
    {
        return true;
    }
    return false;
}
 
#endif // PC_ENABLE_NETADAPT