#9 First working proof of concept, msg dstar->
Geoffrey Merck
4 years ago
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c9e06d3404
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bd3b8650c4
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/*
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* Copyright (C) 2021-2022 by Geoffrey Merck F4FXL / KC3FRA
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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 <boost/algorithm/string.hpp>
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#include "APRSUtils.h"
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void CAPRSUtils::dstarCallsignToAPRS(std::string& dstarCallsign)
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{
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if(dstarCallsign[dstarCallsign.length() - 1] == ' ') {
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boost::trim(dstarCallsign);
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} else {
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//loop until got rid of all double blanks
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while(dstarCallsign.find(" ") != std::string::npos) {
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boost::replace_all(dstarCallsign, " ", " ");
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}
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boost::replace_all(dstarCallsign, " ", "-");//replace remaining blank with a -
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}
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}
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/*
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* Copyright (C) 2021-2022 by Geoffrey Merck F4FXL / KC3FRA
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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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#pragma once
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#include <string>
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class CAPRSUtils
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{
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public:
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static void dstarCallsignToAPRS(std::string& dstarCallsign);
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};
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/*
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* Copyright (C) 2010,2012,2018 by Jonathan Naylor G4KLX
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* Copyright (C) 2021-2022 by Geoffrey Merck F4FXL / KC3FRA
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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 <cstring>
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#include <cassert>
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#include <boost/algorithm/string.hpp>
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#include <vector>
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#include "RSMS1AMessageCollector.h"
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#include "StringUtils.h"
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#include "Log.h"
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#include "Utils.h"
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#include "APRSUtils.h"
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const unsigned int APRS_CSUM_LENGTH = 4U;
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CRSMS1AMessageCollector::CRSMS1AMessageCollector() :
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CSentenceCollector(SLOW_DATA_TYPE_GPS, "$$Msg", '\x0D')
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{
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}
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bool CRSMS1AMessageCollector::isValidSentence(const std::string& sentence)
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{
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return isValidGPSA(sentence);
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}
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bool CRSMS1AMessageCollector::isValidGPSA(const std::string& msg)
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{
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if(msg.empty() || !boost::starts_with(msg, "$$Msg"))
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return false;
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std::vector<std::string> splits;
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boost::split(splits, msg, boost::is_any_of(","));
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bool ret = splits.size() == 4
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&& !splits[1].empty()
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&& !splits[2].empty()
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&& splits[3].length() > 6U;
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return ret;
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// CUtils::dump("RS-MS1A:", (unsigned char *)gpsa.c_str(), gpsa.length() + 1U);
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// CLog::logDebug("RS-MS1A: %s", gpsa.c_str());
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// auto thirdCommaPos = CStringUtils::find_nth(gpsa, 0U, ',', 3);
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// auto csum = calcCRC(gpsa, thirdCommaPos + 6 + 1, gpsa.length() - thirdCommaPos - 2U - 6U);
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// auto csumStr = CStringUtils::string_format("%06X", csum);
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// CLog::logDebug("RS-MS1A CRC: %s", csumStr.c_str());
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// auto expectedCsum = gpsa.substr(5U, APRS_CSUM_LENGTH);
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// bool res = ::strcasecmp(csumStr.c_str(), expectedCsum.c_str()) == 0;
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// return res;
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}
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unsigned int CRSMS1AMessageCollector::calcCRC(const std::string& gpsa, unsigned int start, unsigned int length)
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{
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unsigned int icomcrc = 0xFFFFU;
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auto end = start + length;
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if(end > gpsa.length()) {
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end = gpsa.length();
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}
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for (unsigned int j = start; j < end; j++) {
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unsigned char ch = (unsigned char)gpsa[j];
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for (unsigned int i = 0U; i < 8U; i++) {
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bool xorflag = (((icomcrc ^ ch) & 0x01U) == 0x01U);
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icomcrc >>= 1;
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if (xorflag)
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icomcrc ^= 0x8408U;
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ch >>= 1;
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}
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}
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return ~icomcrc & 0xFFFFU;
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}
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unsigned int CRSMS1AMessageCollector::getDataInt(unsigned char * data, unsigned int length)
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{
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if(data == nullptr || length == 0U || getSentence().empty())
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return 0U;
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auto sentence = getSentence();
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std::vector<std::string> splits;
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boost::split(splits, sentence, boost::is_any_of(","));
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bool ret = splits.size() == 4
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&& !splits[1].empty()
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&& !splits[2].empty()
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&& splits[3].length() > 6U;
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if(!ret) {
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return 0U;
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}
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auto sender = splits[1];
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auto recipient = CUtils::ToUpper(splits[2]);
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auto message = splits[3].substr(6, splits[3].length() - 2);
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CAPRSUtils::dstarCallsignToAPRS(sender);
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CAPRSUtils::dstarCallsignToAPRS(recipient);
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recipient.resize(9, ' ');
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//unescape commas in message body
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boost::replace_all(message, "o,", ",");
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auto aprsFrame = CStringUtils::string_format("%s-5>APDPRS,DSTAR*::%s:%s\r\n", sender.c_str(), recipient.c_str(), message.c_str());
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auto aprsFrameLen = aprsFrame.length();
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if(length < aprsFrameLen) {
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CLog::logDebug("Not enough space to copy GPS-A APRS frame");
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return 0U;
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}
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for(unsigned int i = 0U; i < aprsFrameLen; i++){
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data[i] = aprsFrame[i];
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}
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return aprsFrameLen;
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}
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@ -0,0 +1,42 @@
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/*
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* Copyright (C) 2010,2012,2018 by Jonathan Naylor G4KLX
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* Copyright (C) 2021-2022 by Geoffrey Merck F4FXL / KC3FRA
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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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#pragma once
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#include <string>
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#include "SentenceCollector.h"
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class CRSMS1AMessageCollector : public CSentenceCollector
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{
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public:
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CRSMS1AMessageCollector();
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protected:
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unsigned int getDataInt(unsigned char * data, unsigned int length);
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bool isValidSentence(const std::string& sentence);
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private:
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static unsigned int calcCRC(const std::string& gpsa, unsigned int start, unsigned int length);
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static bool isValidGPSA(const std::string& gpsa);
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std::string m_sentence;
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std::string m_collector;
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};
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