portapack-mayhem/firmware/application/protocols/aprs.cpp

/*
 * Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
 * Copyright (C) 2017 Furrtek
 *
 * This file is part of PortaPack.
 *
 * 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, 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 General Public License
 * along with this program; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */

#include <cstdint>

#include "aprs.hpp"
#include "ax25.hpp"

#include "portapack_persistent_memory.hpp"

using namespace ax25;

namespace aprs {

void make_aprs_frame(const char* src_address, const uint32_t src_ssid, const char* dest_address, const uint32_t dest_ssid, const std::string& payload) {
    AX25Frame frame;

    char address[14] = {0};

    memcpy(&address[0], dest_address, 6);
    memcpy(&address[7], src_address, 6);
    // euquiq: According to ax.25 doc section 2.2.13.x.x and 2.4.1.2
    //  SSID need bits 5.6 set, so later when shifted it will end up being 011xxxx0 (xxxx = SSID number)
    //  Notice that if need to signal usage of AX.25 V2.0, (dest_ssid | 112); (MSb will need to be set at the end)
    address[6] = (dest_ssid | 48);
    address[13] = (src_ssid | 48);

    frame.make_ui_frame(address, 0x03, protocol_id_t::NO_LAYER3, payload);
}

} /* namespace aprs */