#9 Refactor APRS Collection logic
This is quie a deep change. Collecting logic has been moved to individual objects/classes. This reduces amount of code (better maitainability) and prepares the path for supporting messages. Supporting newer slow data types is just a matter of adding new ClowDataCollector. This also brings the benefit to support interleaved slow data as this is the case with RS-MS1A messages (messages are interleaved with GPS Data) The source callsign for NMEA sentences is also set with correct SSID (-5) as per http://www.aprs.org/aprs11/SSIDs.txt The NMEA sentences are no longer converted but sent to APRS-S almost as is, just packed into an APRS frame.pull/32/head
Geoffrey Merck
4 years ago
parent
769701bedc
commit
045127d90b
@ -0,0 +1,99 @@
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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 "GPSACollector.h"
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#include "StringUtils.h"
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#include "Log.h"
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const unsigned int APRS_CSUM_LENGTH = 4U;
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CGPSACollector::CGPSACollector() :
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CSentenceCollector(SLOW_DATA_TYPE_GPS, "$$CRC", '\x0D')
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{
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}
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bool CGPSACollector::isValidSentence(const std::string& sentence)
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{
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return isValidGPSA(sentence);
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}
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bool CGPSACollector::isValidGPSA(const std::string& gpsa)
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{
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if(gpsa.length() < 10U || !boost::starts_with(gpsa, "$$CRC"))
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return false;
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auto csum = calcCRC(gpsa);
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auto csumStr = CStringUtils::string_format("%04X", csum);
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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 CGPSACollector::calcCRC(const std::string& gpsa)
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{
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unsigned int icomcrc = 0xFFFFU;
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auto length = gpsa.length();
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for (unsigned int j = 10U; j < length; 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 CGPSACollector::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 aprsFrame = getSentence();
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if(aprsFrame.length() < 11U)
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return 0U;
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aprsFrame = aprsFrame.substr(10).append("\r\n");
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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 +1,63 @@
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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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/*
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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 CGPSACollector : public CSentenceCollector
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{
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public:
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CGPSACollector();
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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);
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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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@ -0,0 +1,135 @@
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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 <string.h>
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#include <cassert>
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#include <boost/algorithm/string.hpp>
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#include "NMEASentenceCollector.h"
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#include "StringUtils.h"
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#include "Log.h"
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CNMEASentenceCollector::CNMEASentenceCollector(const std::string& sentence) :
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CSentenceCollector(SLOW_DATA_TYPE_GPS, sentence, '\x0A')
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{
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}
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bool CNMEASentenceCollector::isValidSentence(const std::string& sentence)
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{
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return isValidNMEA(sentence);
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}
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bool CNMEASentenceCollector::isValidNMEA(const std::string& nmea)
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{
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if(nmea.empty() || nmea[0] != '$')
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return false;
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auto posStar = nmea.find_last_of('*');
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if(posStar == 0U || posStar == std::string::npos)
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return false;
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auto csum = calcXOR(nmea);
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auto csumStr = CStringUtils::string_format("%02X", csum);
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auto expctedCSumStr = nmea.substr(posStar + 1, 2U);
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auto res = ::strcasecmp(expctedCSumStr.c_str(), csumStr.c_str()) == 0;
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return res;
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}
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unsigned char CNMEASentenceCollector::calcXOR(const std::string& nmea)
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{
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unsigned char res = 0U;
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if(!nmea.empty()) {
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unsigned int i = nmea[0] == '$' ? 1U : 0U; //skip $ it it is there
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while(i < nmea.length())
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{
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if(nmea[i] != '*') {
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res ^= (unsigned char)nmea[i];
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}
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else {
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break;
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}
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i++;
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}
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}
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return res;
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}
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unsigned int CNMEASentenceCollector::getDataInt(unsigned char * data, unsigned int length)
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{
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if(data == nullptr || length == 0U || getMyCall().empty() || getSentence().empty())
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return 0U;
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auto nmea = getSentence();
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fixUpNMEATimeStamp(nmea);
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std::string fromCall = getMyCall();
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dstarCallsignToAPRS(fromCall);
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std::string aprsFrame(fromCall);
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aprsFrame.append("-5>GPS30,DSTAR*:")
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.append(nmea)
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.append("\r\n");
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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 NMEA 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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void CNMEASentenceCollector::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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// When set on manual position Icom radios send 000000.00 as NMEA timestamps
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// this is a dirty hack to correct this issue. Actually I am not sure about APRS
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// software being peeky about this except APRS.fi
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void CNMEASentenceCollector::fixUpNMEATimeStamp(std::string& nmea)
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{
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auto posStar = nmea.find_last_of('*');
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if(posStar != std::string::npos)
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nmea = nmea.substr(0, posStar);
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time_t now;
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::time(&now);
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struct tm* tm = ::gmtime(&now);
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auto timeStamp = CStringUtils::string_format(",%02d%02d%02d.00,", tm->tm_hour, tm->tm_min, tm->tm_sec);
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boost::replace_all(nmea, ",000000.00,", timeStamp);
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//recalculate checksum
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nmea = CStringUtils::string_format("%s*%02x", nmea.c_str(), calcXOR(nmea));
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}
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@ -0,0 +1,40 @@
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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 CNMEASentenceCollector : public CSentenceCollector
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{
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public:
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CNMEASentenceCollector(const std::string& sentence);
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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 void dstarCallsignToAPRS(std::string& call);
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static bool isValidNMEA(const std::string& nmea);
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static unsigned char calcXOR(const std::string& nmea);
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static void fixUpNMEATimeStamp(std::string& nmea);
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};
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@ -0,0 +1,75 @@
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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
|
||||
* 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 <cassert>
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#include "SentenceCollector.h"
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CSentenceCollector::CSentenceCollector(unsigned char slowDataType, const std::string& sentenceIdentifier, unsigned char endMarker) :
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CSlowDataCollector(slowDataType),
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m_collector(),
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m_sentenceIdentifier(sentenceIdentifier),
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m_sentence(),
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m_endMarker(endMarker)
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{
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assert(!sentenceIdentifier.empty());
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}
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bool CSentenceCollector::addData(const unsigned char * data)
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{
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m_collector.append(std::string((char*)data, 5U));
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std::string::size_type n2 = m_collector.find_last_of(m_endMarker);
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if (n2 == std::string::npos)
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return false;
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std::string::size_type n1 = m_collector.find(m_sentenceIdentifier);
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if (n1 == std::string::npos)
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return false;
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if(n2 < n1)
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return false;
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std::string sentence;
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for(unsigned int i = n1; i <= n2; i++) {
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sentence.push_back(m_collector[i] & 0x7FU);
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}
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bool ret = isValidSentence(sentence);
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if(ret) {
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m_sentence = sentence;
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} else {
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m_sentence.clear();
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}
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m_collector = m_collector.substr(n2);
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return ret;
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}
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std::string CSentenceCollector::getSentence()
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{
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return m_sentence;
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}
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void CSentenceCollector::resetInt()
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{
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m_collector.clear();
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m_sentence.clear();
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}
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@ -0,0 +1,46 @@
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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
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; either version 2 of the License, or
|
||||
* (at your option) any later version.
|
||||
*
|
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* 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; if not, write to the Free Software
|
||||
* 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 "SlowDataCollector.h"
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class CSentenceCollector : public CSlowDataCollector
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{
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public:
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CSentenceCollector(unsigned char slowDataType, const std::string& sentenceIdentifier, unsigned char endMarker);
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protected:
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bool addData(const unsigned char * data);
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virtual unsigned int getDataInt(unsigned char * data, unsigned int length) = 0;
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static void dstarCallsignToAPRS(std::string& call);
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std::string getSentence();
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private:
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virtual bool isValidSentence(const std::string& sentence) = 0;
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virtual void resetInt();
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std::string m_collector;
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std::string m_sentenceIdentifier;
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std::string m_sentence;
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unsigned char m_endMarker;
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};
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@ -0,0 +1,97 @@
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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
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; either version 2 of the License, 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; if not, write to the Free Software
|
||||
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
||||
*/
|
||||
|
||||
#include <cassert>
|
||||
#include <cstring>
|
||||
|
||||
#include "SlowDataCollector.h"
|
||||
|
||||
const unsigned int SLOW_DATA_BLOCK_LENGTH = 6U;
|
||||
|
||||
CSlowDataCollector::CSlowDataCollector(unsigned char slowDataType) :
|
||||
m_slowDataType(slowDataType),
|
||||
m_myCall(),
|
||||
m_state(SS_FIRST)
|
||||
{
|
||||
m_buffer = new unsigned char[SLOW_DATA_BLOCK_LENGTH];
|
||||
std::memset(m_buffer, 0, SLOW_DATA_BLOCK_LENGTH);
|
||||
}
|
||||
|
||||
CSlowDataCollector::~CSlowDataCollector()
|
||||
{
|
||||
delete[] m_buffer;
|
||||
}
|
||||
|
||||
std::string CSlowDataCollector::getMyCall() const
|
||||
{
|
||||
return m_myCall;
|
||||
}
|
||||
|
||||
void CSlowDataCollector::setMyCall(const std::string& myCall)
|
||||
{
|
||||
m_myCall = myCall;
|
||||
}
|
||||
|
||||
bool CSlowDataCollector::writeData(const unsigned char* data)
|
||||
{
|
||||
assert(data != nullptr);
|
||||
|
||||
switch (m_state) {
|
||||
case SS_FIRST:
|
||||
m_buffer[0U] = data[0U] ^ SCRAMBLER_BYTE1;
|
||||
m_buffer[1U] = data[1U] ^ SCRAMBLER_BYTE2;
|
||||
m_buffer[2U] = data[2U] ^ SCRAMBLER_BYTE3;
|
||||
m_state = SS_SECOND;
|
||||
return false;
|
||||
|
||||
case SS_SECOND:
|
||||
m_buffer[3U] = data[0U] ^ SCRAMBLER_BYTE1;
|
||||
m_buffer[4U] = data[1U] ^ SCRAMBLER_BYTE2;
|
||||
m_buffer[5U] = data[2U] ^ SCRAMBLER_BYTE3;
|
||||
m_state = SS_FIRST;
|
||||
break;
|
||||
}
|
||||
|
||||
if((m_buffer[0] & SLOW_DATA_TYPE_MASK) == m_slowDataType)
|
||||
return addData(m_buffer + 1U);
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
void CSlowDataCollector::sync()
|
||||
{
|
||||
m_state = SS_FIRST;
|
||||
}
|
||||
|
||||
unsigned int CSlowDataCollector::getData(unsigned char * data, unsigned int length)
|
||||
{
|
||||
return getDataInt(data, length);
|
||||
}
|
||||
|
||||
void CSlowDataCollector::reset()
|
||||
{
|
||||
m_state = SS_FIRST;
|
||||
m_myCall.clear();
|
||||
resetInt();
|
||||
}
|
||||
|
||||
unsigned char CSlowDataCollector::getDataType()
|
||||
{
|
||||
return m_slowDataType;
|
||||
}
|
||||
@ -0,0 +1,51 @@
|
||||
/*
|
||||
* Copyright (C) 2010,2012,2018 by Jonathan Naylor G4KLX
|
||||
* Copyright (C) 2021-2022 by Geoffrey Merck F4FXL / KC3FRA
|
||||
*
|
||||
* 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 of the License, 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; if not, write to the Free Software
|
||||
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
||||
*/
|
||||
|
||||
#pragma once
|
||||
|
||||
#include <string>
|
||||
|
||||
#include "DStarDefines.h"
|
||||
#include "Defs.h"
|
||||
|
||||
class CSlowDataCollector
|
||||
{
|
||||
public:
|
||||
CSlowDataCollector(unsigned char slowDataType);
|
||||
virtual ~CSlowDataCollector();
|
||||
|
||||
std::string getMyCall() const;
|
||||
void setMyCall(const std::string& mycall);
|
||||
bool writeData(const unsigned char* data);
|
||||
void sync();
|
||||
unsigned int getData(unsigned char* data, unsigned int length);
|
||||
void reset();
|
||||
unsigned char getDataType();
|
||||
|
||||
protected:
|
||||
virtual bool addData(const unsigned char* data) = 0;
|
||||
virtual unsigned int getDataInt(unsigned char* data, unsigned int length) = 0;
|
||||
virtual void resetInt() { }
|
||||
|
||||
private:
|
||||
unsigned char m_slowDataType;
|
||||
std::string m_myCall;
|
||||
SLOWDATA_STATE m_state;
|
||||
unsigned char * m_buffer;
|
||||
};
|
||||
Loading…
Reference in new issue