New Plugin NmeaConvertor

[Topodom]

I have tried without spaces :

$XXMWV_formula,$WIMWV1,cos($WIMWV3+$WIMWV3),int(pi*3.1111)

same result :

<GREEN>13:12:10 (Virtual:) $XXMWV_formula,274.1,cos(11.1+11.1),int(pi*3.1111)*68<0x0D><0x0A>

[rgleason]

Originally Posted by pa391as

I could not figure out how to become a wiki editor, can you advise, or post my example to the wiki?

SEND ME A PM

[ian5142]

May I get some help on changing the date in the incoming ZDA sentence? I have a furuno GP32, which outputs the incorrect date, but the time is still correct.

I opened a ticket on github before finding this thread: https://github.com/RooieDirk/NmeaConverter_pi/issues/23

I have knowledge of virtual COM ports and even went so far as trying to write my own CLI java program. My program works but it is too slow, I end up missing incoming location data.

Basically, my question is can this be done using your plugin?

[rooiedirk]

Short answer no.


It won't work because you can't resend a changed sentence with the same header without introducing a loop. However if you are able to alter the header with an external program or javascript into something OpenCPN is not using, then yes.
ae if you change extern an incoming:

$GPZDA,hhmmss.ss,xx,xx,xxxx,xx,xx*hh<CR><LF>
into
$WRONG,hhmmss.ss,xx,xx,xxxx,xx,xx*hh<CR><LF>
then you can use the pluging to change the incoming $WRONG sentence back in an altered $xxZDA.

You need to change the sentence before it is coming into OpenCPN as otherwise O is 'seeing' two different ZDA sentences and cant know wich one is correct, and also constant flipping the date.

[ian5142]

Can I just change the talker ID into something else in your plugin?

[rooiedirk]

Yes you can.

[ian5142]

My question was more, how do I dynamically grab the date from the computer / OpenCPN to update the sentence?

[monkeyx]

Originally Posted by ian5142

May I get some help on changing the date in the incoming ZDA sentence? I have a furuno GP32, which outputs the incorrect date, but the time is still correct.

I opened a ticket on github before finding this thread: https://github.com/RooieDirk/NmeaConverter_pi/issues/23

I have knowledge of virtual COM ports and even went so far as trying to write my own CLI java program. My program works but it is too slow, I end up missing incoming location data.

Basically, my question is can this be done using your plugin?

Maybe look at using Node_Red to format the data as you want it?

[Antipole]

@ian5142 you can do what you want with the JavaScript plugin. In the user guide is an example of modifying an NMEA record and sending with different talker. You can fix the date/time as you wish.

[LennartG]

Trying to convert GPZDA contained date information to e.g. RMC contained date format and fails miserably.
The GPZDA uses, in fields 2 thru 4 'DD,MM,YYYY' while e.g. RMC has the date information in field 7 as 'DDMMYY'. Looks simple enough if using something like this:

10000 * $??ZDA2 + 100 * $??ZDA3 + $??ZDA4 - 2000

That however fails if day or month has a leading zero like for 21'st of March (today). The result simply displays '321', always terminated to the last three digits if day or month has a leading zero.
Other examples using numbers for date and month pinpointing the problem:

10000 * 01 + 100 * 12 + $??ZDA4 - 2000 ----> 221 Error
10000 * 01 + 100 * 03 + $??ZDA4 - 2000 ----> 321 Error
10000 * 10 + 100 * 03 + $??ZDA4 - 2000 ----> 321 Error
10000 * 10 + 100 * 12 + $??ZDA4 - 2000 ----> 101221 Correct!

What am I missing here?

[LennartG]

The problem described in #355 now filed as a bug with Github rooiedirk/NmeaConverter

[LennartG]

Almost two weeks now and not a single reply nor a suggestion how to get around this bug.
Have tried lots of alternatives but nothing works . . . .

Anybody? Please!

[Antipole]

Originally Posted by LennartG

Almost two weeks now and not a single reply nor a suggestion how to get around this bug.
Have tried lots of alternatives but nothing works . . . .

Anybody? Please!

You can do what you want with the JavaScript plugin - see my earlier reply

@ian5142 you can do what you want with the JavaScript plugin. In the user guide is an example of modifying an NMEA record and sending with different talker. You can fix the date/time as you wish.

[LennartG]

Antipole,
thanks for the reply. Had a look at your Java scripting tool before and I will give it a try again, not being a programmer but a system engineer it is not such a simple task.
Have a NMEA 2000 GPS but neither TwoCan nor Signal K generates the RMC sentence. What I'm aiming at is a complete build of RMC from ZDA, GLL, VTG and eventually HDG. Have all but date working thru NmeaConverter.
/LennartG

[arnolddemaa]

Hi, I would like to display the ETA on min instruments. Unfortunately, opencpn only returns ECRMB, ECRMC, ECAPB, ECXTE. to show the eta you need ZTG. I was wondering if you can calculate this using the nmea converter plugin