mirror of
https://github.com/g4klx/MMDVMHost
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172 lines
3.4 KiB
C++
172 lines
3.4 KiB
C++
/*
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* Copyright (C) 2020,2023 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 "AX25Network.h"
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#include "AX25Defines.h"
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#include "MQTTConnection.h"
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#include "Utils.h"
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#include "Log.h"
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#if defined(USE_AX25)
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#include <cstdio>
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#include <cassert>
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#include <cstring>
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// In Log.cpp
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extern CMQTTConnection* m_mqtt;
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CAX25Network::CAX25Network(bool debug) :
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m_buffer(1000U, "AX.25 buffer"),
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m_debug(debug),
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m_enabled(false)
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{
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}
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CAX25Network::~CAX25Network()
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{
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}
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bool CAX25Network::open()
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{
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LogMessage("Opening AX.25 network connection");
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return true;
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}
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bool CAX25Network::write(const unsigned char* data, unsigned int length)
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{
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assert(data != NULL);
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assert(m_mqtt != NULL);
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if (!m_enabled)
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return true;
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unsigned char txData[500U];
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unsigned int txLength = 0U;
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txData[txLength++] = AX25_FEND;
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txData[txLength++] = AX25_KISS_DATA;
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for (unsigned int i = 0U; i < length; i++) {
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unsigned char c = data[i];
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switch (c) {
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case AX25_FEND:
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txData[txLength++] = AX25_FESC;
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txData[txLength++] = AX25_TFEND;
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break;
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case AX25_FESC:
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txData[txLength++] = AX25_FESC;
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txData[txLength++] = AX25_TFESC;
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break;
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default:
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txData[txLength++] = c;
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break;
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}
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}
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txData[txLength++] = AX25_FEND;
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if (m_debug)
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CUtils::dump(1U, "AX.25 Network Data Sent", txData, txLength);
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m_mqtt->publish("ax25-out", txData, txLength);
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return true;
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}
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unsigned int CAX25Network::read(unsigned char* data, unsigned int length)
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{
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assert(data != NULL);
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assert(length > 0U);
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if (!m_buffer.isEmpty())
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return 0U;
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unsigned int dataLen = 0U;
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m_buffer.getData((unsigned char*)&dataLen, sizeof(unsigned int));
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assert(length >= dataLen);
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m_buffer.getData(data, dataLen);
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return dataLen;
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}
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void CAX25Network::setData(const unsigned char* data, unsigned int length)
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{
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assert(data != NULL);
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assert(length > 0U);
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if (m_debug)
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CUtils::dump(1U, "AX.25 Network Data Received", data, length);
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if (data[0U] != AX25_FEND)
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return;
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bool complete = false;
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unsigned char rxData[500U];
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unsigned int rxLength = 0U;
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unsigned char lastChar = 0x00U;
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for (unsigned int i = 2U; i < length; i++) {
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unsigned char c = data[i];
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if (c == AX25_FEND) {
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complete = true;
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break;
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} else if (c == AX25_TFEND && lastChar == AX25_FESC) {
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rxData[rxLength++] = AX25_FEND;
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} else if (c == AX25_TFESC && lastChar == AX25_FESC) {
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rxData[rxLength++] = AX25_FESC;
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} else {
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rxData[rxLength++] = c;
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}
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lastChar = c;
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}
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if (!complete)
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return;
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m_buffer.addData((unsigned char*)&rxLength, sizeof(unsigned int));
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m_buffer.addData(rxData, rxLength);
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}
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void CAX25Network::reset()
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{
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}
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void CAX25Network::close()
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{
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LogMessage("Closing AX.25 network connection");
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}
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void CAX25Network::enable(bool enabled)
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{
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m_enabled = enabled;
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if (enabled != m_enabled)
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m_buffer.clear();
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}
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#endif
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