Re: ✘NMEA2000 and issue #176

[Reinhard Arlt]

Hello,

On 12/17/21 3:12 AM, Gary E. Miller wrote:
> Yo Paul!
>
> Replying to my own message.
>
> > Next problem:
> >
> > # tests/test_nmea2000 test/nmea2000/logfile_20140914_365495765_can.log
> > tests/test_nmea2000: line 93: tests/gpsd: No such file or directory
> > tests/test_nmea2000: line 97: tests/gpspipe: No such file or directory

Yes, the calculation of GPSD_HOME may be wrong, i do not understand it 
today. Maybe test_nmea2000 reside in the gpsd home directory once.

> > [hangs...]
>
> I hacked the script to jsut use system gpsd and gpspipe, not a real
> solution, but let me see results.  Eventually.  Tokk almost 4 mins to
> run, I thgouht it has crashed.
>
> Not too bad, but really out of data.  The .chk file has the old
> data lengths.  So instead of:
>
> < $GPGBS,165638,7.29,M,8.30,M,24.15,M*04
>
> We now have:
>
> > $GPGBS,165638.00,7.287,8.293,24.150,,,,*76
>
> In pretty much every pseudo NMEA and JSON message.  Easy to fix.
>
> TPV also has some new values, So instead of:
>
> < 
> {"class":"TPV","device":"nmea2000://vcan0","mode":3,"time":"2014-09-14T16:56:38.000Z","ept":0.005,"lat":37.922036200,"lon":23.016931900,"alt":9.813,"epx":7.286,"epy":8.304,"epv":24.150,"track":282.2390,"speed":0.100,"climb":0.000,"eps":16.61,"epc":48.30}
>
> Now have also have eph, sep, etc::
>
> > {"class":"TPV","device":"nmea2000://vcan0:17","mode":3,"time":"2014-09-14T16:56:38.000Z","ept":0.005,"lat":37.922036200,"lon":23.016931900,"altHAE":44.8129,"altMSL":7.9774,"alt":7.9774,"epx":7.287,"epy":8.293,"epv":24.150,"track":282.2390,"magtrack":4.5651,"magvar":4.6,"speed":0.100,"climb":0.000,"eps":8.29,"epc":24.15,"geoidSep":35.000,"eph":13.870,"sep":24.480}
>
> Again, easy to fix, just update the .chk file.
>
> But I dont not understand why the path is sometimes this:
>
> < 
> {"class":"TPV","device":"nmea2000://vcan0","mode":3,"time":"2014-09-14T16:56:38.000Z"
>
> And semetimes this:
>
> > {"class":"TPV","device":"nmea2000://vcan0:17","mode":3,"time":"2014-09-14T16:56:38.000Z"
>
> Is the :17 a device address of some sort?  Shouldn't it always be there?
> Would that be the way to tell two GPS on the bus apart?


As the gpsd user do not know the device id's on startup, i chose the 
name from the command line for the first device, and open the other 
devices with the appended address, an other solution would be to not 
using the intern structures for the device with the name from the 
commandline at all.
> RGDS
> GARY
> ---------------------------------------------------------------------------
> Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
>         gem@rellim.com  Tel:+1 541 382 8588
>
>             Veritas liberabit vos. -- Quid est veritas?
>      "If you can't measure it, you can't improve it." - Lord Kelvin

Kind regards

Reinhard Arlt