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1 year, 9 months ago.

[C027] CellLocate results are different , using the tool(m-center) and using the mbed code.Why?

When CellLocate is done with mbed-C027, the results are different when using the tool and when using the mbed code.Why?

  • tool result:35.7037449,139.7623999
  • mbed result: latitude: 36.00000, longitude: 138.00000

Are they rounded off?

I think the cause is a parser of MDM.cpp. Is not there a mistake when getting floating point with sscanf? It is the following part.

}else if (sscanf(cmd, "UULOC: %d/%d/%d,%d:%d:%d.%*d,%f,%f,%d,%d,%d,%d,%d,%d,%d,%*d,%*d",\
                        &_loc[0].time.tm_mday, &_loc[0].time.tm_mon, &_loc[0].time.tm_year, &_loc[0].time.tm_hour, &_loc[0].time.tm_min, &_loc[0].time.tm_sec,\
                        &_loc[0].latitude, &_loc[0].longitude, &_loc[0].altitutude, &_loc[0].uncertainty, &_loc[0].speed, &_loc[0].direction, &_loc[0].verticalAcc, \
                        &b, &_loc[0].svUsed) == 15) {
                    TRACE("Parsed UULOC position at index 0\r\n");     

Original source is https://developer.mbed.org/teams/ublox/code/C027_Support/

[1] is mbed run log [2] is m-center log [3] is source code

[1]

Modem::wakeup
Modem::init
Modem::devStatus
  Device:       LISA-U2
  Power Save:   Disabled
  CCID:         8981100023561854336
  IMEI:         352648069548865
  IMSI:         440103148290527
  Manufacturer: u-blox
  Model:        LISA-U200
  Version:      22.90,A01.01
Modem::register
Modem::netStatus
  CSD Registration:   Home
  PSD Registration:   Home
  Access Technology:  3G
  Signal Strength:    -69 dBm
  Bit Error Rate:     25
  Operator:           NTT DOCOMO
  Location Area Code: 00EC
  Cell ID:            0448402F
Modem::join
Modem:IP 100.96.76.190
Make a Http Post Request
Socket Recv "HTTP/1.1 200 OK
Server: nginx/1.11.12
Date: Thu, 11 May 2017 01:58:12 GMT
Content-Type: text/plain
Content-Length: 14
Connection: close
Last-Modified: Fri, 27 Jul 2012 13:30:34 GMT
Accept-Ranges: bytes
Cache-Control: max-age=36000
Expires: Thu, 1"
Testing TCP sockets with ECHO server
Socket Send 31 "
TCP Socket Hello World
End
"
Socket Recv 63 "u-blox AG TCP/UDP test service

TCP Socket Hello World
End
"
Testing UDP sockets with ECHO server
Socket SendTo echo.u-blox.com:7 195.34.89.241 31 "
UDP Socket Hello World
End
"
Socket RecvFrom 195.34.89.241:7 31 "
UDP Socket Hello World
End
"
Modem::disconnect
Ussd Send Command *130#
SMS and GPS Loop
Command not supported
CellLocate Request
Waiting for CellLocate...
Waiting for CellLocate...
Waiting for CellLocate...
Waiting for CellLocate...
Waiting for CellLocate...
Waiting for CellLocate...
Waiting for CellLocate...
CellLocate Request
CellLocate position received, sensor_used: 0,
  latitude: 0.00000, longitude: 0.00000, altitute: 0
CellLocate Request
CellLocate position received, sensor_used: 0,
  latitude: 36.00000, longitude: 138.00000, altitute: 0 <------------------------------------------------------------------------*1
CellLocate Request
CellLocate position received, sensor_used: 0,
  latitude: 36.00000, longitude: 138.00000, altitute: 0
CellLocate Request
CellLocate position received, sensor_used: 0,
  latitude: 36.00000, longitude: 138.00000, altitute: 0
CellLocate Request
Waiting for CellLocate...
Waiting for CellLocate...
Waiting for CellLocate...
Waiting for CellLocate...
Waiting for CellLocate...

[2]

AT+UGAOP="eval1-les.services.u-blox.com",46434,1000,0


OK

AT+ULOCCELL=0


OK

AT+ULOC=2,2,1,100,5000


OK

+UULOC: 01/01/2004,00:03:19.000,0.0000000,0.0000000,0,20000000,0,0,0,0,0,0,0

AT+UGAOP="eval1-les.services.u-blox.com",46434,1000,0


OK

AT+ULOCCELL=0


OK

AT+ULOC=2,2,1,100,5000


OK

+UULOC: 11/05/2017,02:09:53.000,35.7037449,139.7623999,50,1000,0,0,0,2,0,0,0 <-------------------------------*2

[3]

int main(void)
{
/*
    int ret;
#ifdef LARGE_DATA
    char buf[2048] = "";
#else
    char buf[512] = "";
#endif
*/
    // Create the GPS object
#if 1   // use GPSI2C class
    GPSI2C gps;
#else   // or GPSSerial class 
    GPSSerial gps; 
#endif
/*
    // Create the modem object
    MDMSerial mdm; // use mdm(D1,D0) if you connect the cellular shield to a C027
    //mdm.setDebug(4); // enable this for debugging issues 
    // initialize the modem 
    MDMParser::DevStatus devStatus = {};
    MDMParser::NetStatus netStatus = {};
    bool mdmOk = mdm.init(SIMPIN, &devStatus);
    mdm.dumpDevStatus(&devStatus);
*/
    int ret;
    char buf[256] = "";
    //give time to module for powering up (ms)
    wait_ms(1000);
    // Create the modem object
    MDMSerial mdm;
    mdm.set_flow_control(SerialBase::RTSCTS, MDMRTS, MDMCTS);
    wait(5);
    //mdm.setDebug(4); // enable this for debugging issues
    // initialize the modem 
    MDMParser::DevStatus devStatus = {};
    MDMParser::NetStatus netStatus = {};
    bool mdmOk = mdm.init(SIMPIN, &devStatus);
    mdm.dumpDevStatus(&devStatus);
    
    if (mdmOk) {
        // wait until we are connected
        mdmOk = mdm.registerNet(&netStatus);
        mdm.dumpNetStatus(&netStatus);
    }
    if (mdmOk)
    {
        // join the internet connection 
        MDMParser::IP ip = mdm.join(APN,USERNAME,PASSWORD);
        if (ip == NOIP)
            printf("Not able to join network");
        else
        {
            mdm.dumpIp(ip);
            printf("Make a Http Post Request\r\n");
            int socket = mdm.socketSocket(MDMParser::IPPROTO_TCP);
            if (socket >= 0)
            {
                mdm.socketSetBlocking(socket, 10000);
                if (mdm.socketConnect(socket, "mbed.org", 80))
                {
                    const char http[] = "GET /media/uploads/mbed_official/hello.txt HTTP/1.0\r\n\r\n";
                    mdm.socketSend(socket, http, sizeof(http)-1);
                
                    ret = mdm.socketRecv(socket, buf, sizeof(buf)-1);
                    if (ret > 0)
                        printf("Socket Recv \"%*s\"\r\n", ret, buf);
                    mdm.socketClose(socket);
                }
                mdm.socketFree(socket);
            }
            
            int port = 7;
            const char* host = "echo.u-blox.com";
            MDMParser::IP ip = mdm.gethostbyname(host);
            char data[] = "\r\nxxx Socket Hello World\r\n"       
                        "End\r\n";
                
            printf("Testing TCP sockets with ECHO server\r\n");
            socket = mdm.socketSocket(MDMParser::IPPROTO_TCP);
            if (socket >= 0)
            {
                mdm.socketSetBlocking(socket, 10000);
                if (mdm.socketConnect(socket, host, port)) {
                    memcpy(data, "\r\nTCP", 5); 
                    ret = mdm.socketSend(socket, data, sizeof(data)-1);
                    if (ret == sizeof(data)-1) {
                        printf("Socket Send %d \"%s\"\r\n", ret, data);
                    }
                    ret = mdm.socketRecv(socket, buf, sizeof(buf)-1);
                    if (ret >= 0) {
                        printf("Socket Recv %d \"%.*s\"\r\n", ret, ret, buf);
                    }
                    mdm.socketClose(socket);
                }
                mdm.socketFree(socket);
            }

            printf("Testing UDP sockets with ECHO server\r\n");
            socket = mdm.socketSocket(MDMParser::IPPROTO_UDP, port);
            if (socket >= 0)
            {
                mdm.socketSetBlocking(socket, 10000);
                memcpy(data, "\r\nUDP", 5); 
                ret = mdm.socketSendTo(socket, ip, port, data, sizeof(data)-1);
                if (ret == sizeof(data)-1) {
                    printf("Socket SendTo %s:%d " IPSTR " %d \"%s\"\r\n", host, port, IPNUM(ip), ret, data);
                }
                ret = mdm.socketRecvFrom(socket, &ip, &port, buf, sizeof(buf)-1);
                if (ret >= 0) {
                    printf("Socket RecvFrom " IPSTR ":%d %d \"%.*s\" \r\n", IPNUM(ip),port, ret, ret,buf);
                }
                mdm.socketFree(socket);
            }
            
            // disconnect  
            mdm.disconnect();
        }
    
        // http://www.geckobeach.com/cellular/secrets/gsmcodes.php
        // http://de.wikipedia.org/wiki/USSD-Codes
        const char* ussd = "*130#"; // You may get answer "UNKNOWN APPLICATION"
        printf("Ussd Send Command %s\r\n", ussd);
        ret = mdm.ussdCommand(ussd, buf);
        if (ret > 0) 
            printf("Ussd Got Answer: \"%s\"\r\n", buf);
    }
 
    printf("SMS and GPS Loop\r\n");
    char link[128] = "";
    unsigned int i = 0xFFFFFFFF;
    const int wait = 100;
    bool abort = false;
#ifdef CELLOCATE    
    const int sensorMask = 3;       // Hybrid: GNSS + CellLocate       
    const int timeoutMargin = 5;    // seconds
    const int submitPeriod = 60;    // 1 minutes in seconds
    const int targetAccuracy = 1;   // meters
    unsigned int j = submitPeriod * 1000/wait;
    bool cellLocWait = false;
    MDMParser::CellLocData loc;
    
    //Token can be released from u-blox site, when you got one replace "TOKEN" below 
    //// if (!mdm.cellLocSrvHttp("TOKEN"))
    if (!mdm.cellLocSrvTcp("TOKEN"))
            mdm.cellLocSrvUdp();        
    /// mdm.cellLocConfigSensor(1);
    mdm.cellLocConfig(1);           // Deep scan mode            +ULOCCELL
    
    //mdm.cellUnsolIndication(1);
#endif
    DigitalOut led(LED1);
    while (!abort) {
        led = !led;
#ifndef CELLOCATE
        while ((ret = gps.getMessage(buf, sizeof(buf))) > 0)
        {
            int len = LENGTH(ret);
            //printf("NMEA: %.*s\r\n", len-2, msg); 
            if ((PROTOCOL(ret) == GPSParser::NMEA) && (len > 6))
            {
                // talker is $GA=Galileo $GB=Beidou $GL=Glonass $GN=Combined $GP=GPS
                if ((buf[0] == '$') || buf[1] == 'G') {
                    #define _CHECK_TALKER(s) ((buf[3] == s[0]) && (buf[4] == s[1]) && (buf[5] == s[2]))
                    if (_CHECK_TALKER("GLL")) {
                        double la = 0, lo = 0;
                        char ch;
                        if (gps.getNmeaAngle(1,buf,len,la) && 
                            gps.getNmeaAngle(3,buf,len,lo) && 
                            gps.getNmeaItem(6,buf,len,ch) && ch == 'A')
                        {
                            printf("GPS Location: %.5f %.5f\r\n", la, lo); 
                            sprintf(link, "I am here!\n"
                                          "https://maps.google.com/?q=%.5f,%.5f", la, lo); 
                        }
                    } else if (_CHECK_TALKER("GGA") || _CHECK_TALKER("GNS") ) {
                        double a = 0; 
                        if (gps.getNmeaItem(9,buf,len,a)) // altitude msl [m]
                            printf("GPS Altitude: %.1f\r\n", a); 
                    } else if (_CHECK_TALKER("VTG")) {
                        double s = 0; 
                        if (gps.getNmeaItem(7,buf,len,s)) // speed [km/h]
                            printf("GPS Speed: %.1f\r\n", s); 
                    }
                }
            }
        }
#endif        
#ifdef CELLOCATE
        if (mdmOk && (j++ == submitPeriod * 1000/wait)) {   
            j=0;
            printf("CellLocate Request\r\n");
            /// mdm.cellLocRequest(sensorMask, submitPeriod-timeoutMargin, targetAccuracy);
            mdm.cellLocRequest(MDMParser::CELL_LOCATE, 15, 1, MDMParser::CELL_DETAILED, 1);
            cellLocWait = true;
        }
        /// if (cellLocWait && mdm.cellLocGet(&loc)){           
        if (cellLocWait && mdm.cellLocGetData(&loc)){  
            cellLocWait = false;     
            printf("CellLocate position received, sensor_used: %d,  \r\n", loc.sensor );           
            printf("  latitude: %0.5f, longitude: %0.5f, altitute: %d\r\n", loc.latitude, loc.longitude, loc.altitutude);
            if (loc.sensor == 1)
                printf("  uncertainty: %d, speed: %d, direction: %d, vertical_acc: %d, satellite used: %d \r\n", loc.uncertainty,loc.speed,loc.direction,loc.verticalAcc,loc.svUsed);        
            if (loc.sensor == 1 || loc.sensor == 2)
            sprintf(link, "I am here!\n"
                        "https://maps.google.com/?q=%.5f,%.5f", loc.latitude, loc.longitude);       
        }
        if (cellLocWait && (j%100 == 0 ))
            printf("Waiting for CellLocate...\r\n");                
#endif        
        Thread::wait(wait);
    }
    printf ("GNSS Power Off\r\n");
    gps.powerOff();
    printf ("Modem Power Off\r\n");
    mdm.powerOff();
    return 0;
}

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1 Answer

2 months, 3 weeks ago.

Hey U got any answer if you still able to see this quest?? I am facing same problem here.


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