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139 lines
3.4 KiB
139 lines
3.4 KiB
/*
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* Copyright (C) 2016 by Jonathan Naylor G4KLX
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "GPS.h"
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#include "YSFPayload.h"
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#include "YSFDefines.h"
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#include "Utils.h"
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#include "Log.h"
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#include <cstdio>
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#include <cassert>
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#include <cstring>
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const unsigned char NULL_GPS[] = {0x47U, 0x63U, 0x5FU};
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const unsigned char SHRT_GPS[] = {0x22U, 0x62U, 0x5FU};
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const unsigned char LONG_GPS[] = {0x47U, 0x64U, 0x5FU};
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CGPS::CGPS(const std::string& hostname, unsigned int port, const std::string& password) :
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m_hostname(hostname),
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m_port(port),
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m_password(password),
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m_buffer(NULL),
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m_dt1(false),
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m_dt2(false),
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m_sent(false)
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{
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assert(port > 0U);
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m_buffer = new unsigned char[20U];
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}
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CGPS::~CGPS()
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{
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delete[] m_buffer;
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}
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void CGPS::data(const unsigned char* source, const unsigned char* data, unsigned char fi, unsigned char dt, unsigned char fn)
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{
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if (m_sent)
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return;
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// In case we had the data but not the source callsign
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if (m_dt1 && m_dt2) {
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transmitGPS(source);
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return;
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}
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CYSFPayload payload;
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if (fi == YSF_FI_COMMUNICATIONS && dt == YSF_DT_VD_MODE1) {
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if (fn == 3U && !m_dt1) {
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bool valid = payload.readVDMode1Data(data, m_buffer);
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if (valid) {
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m_dt1 = true;
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m_dt2 = true;
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// If no GPS data then mark it as complete for this transmission
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if (::memcmp(m_buffer + 1U, NULL_GPS, 3U) == 0) {
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CUtils::dump("Null GPS data received", m_buffer, 20U);
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m_sent = true;
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}
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if (::memcmp(m_buffer + 1U, SHRT_GPS, 3U) == 0) {
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CUtils::dump("Short GPS data received", m_buffer, 20U);
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transmitGPS(source);
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}
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if (::memcmp(m_buffer + 1U, LONG_GPS, 3U) == 0) {
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CUtils::dump("Long GPS data received", m_buffer, 20U);
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transmitGPS(source);
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}
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}
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}
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} else if (fi == YSF_FI_COMMUNICATIONS && dt == YSF_DT_VD_MODE2) {
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if (fn == 6U && !m_dt1) {
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bool valid = payload.readVDMode2Data(data, m_buffer + 0U);
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if (valid) {
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m_dt1 = true;
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// If no GPS data then mark it as complete for this transmission
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if (::memcmp(m_buffer + 1U, NULL_GPS, 3U) == 0) {
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CUtils::dump("Null GPS data received", m_buffer, 20U);
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m_sent = true;
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m_dt2 = true;
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}
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}
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}
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if (fn == 7U && !m_dt2) {
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bool valid = payload.readVDMode2Data(data, m_buffer + 10U);
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if (valid) {
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m_dt2 = true;
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if (::memcmp(m_buffer + 1U, SHRT_GPS, 3U) == 0) {
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CUtils::dump("Short GPS data received", m_buffer, 20U);
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transmitGPS(source);
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}
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if (::memcmp(m_buffer + 1U, LONG_GPS, 3U) == 0) {
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CUtils::dump("Long GPS data received", m_buffer, 20U);
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transmitGPS(source);
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}
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}
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}
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}
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}
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void CGPS::reset()
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{
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m_dt1 = false;
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m_dt2 = false;
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m_sent = false;
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}
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void CGPS::transmitGPS(const unsigned char* source)
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{
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// We don't know who its from!
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if (::memcmp(source, " ", YSF_CALLSIGN_LENGTH) == 0)
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return;
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m_sent = true;
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}
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