Re: Can't preserve the raw AIS message

[Gary E. Miller]

Yo Owen!

On Thu, 1 Oct 2020 13:04:01 +0100
Owen Mather <opm24@btinternet.com> wrote:

> So the data before the !AIVDM is a TAG block as defined by NMEA 0183.
> \s:A01-CS084,c:1600862415,t:LIVE*59\!AIVDM,1,1,,A,38;?cf10008aPTl8G3:P090L0P00,0*2F

Still looks invalid to me.  No line endings, spurious backslashes, no lead
in character.

NMEA starts with a $, AIS starts with a dolar.  Nothing gpsd understands
starts with \s

> (I’m not sure if you’ll be able to see the image below)

I see it, but I don't understand the context.  NMEA != AIS.

> I ran the below so I so I can send data to Gpsd over 62209:
> nc -l 62209 | gpsd -n -N /dev/stdin

Interesting idea.

> Then I sent the following message:
> echo
> '\s:A01-CS084,c:1600862415,t:LIVE*59\!AIVDM,1,1,,A,38;?cf10008aPTl8G3:P090L0P00,0*2F'

As above, invalid message.

> So I believe using -R is meant to give me the full raw, but this
> appears not the case.

Yes, and no.  Without proper line endings and valid chars the rest of your
message is ignored as invalid.

> When I say I want to preserve the part before AIVDM

gpsd throws away invalid data.

> It’s because \s:A01-CS084,c:1600862415,t:LIVE*59\
> provides useful information such as source and time that I want to
> use with the decode message.

No, it is malformed and invalid.

> >> I have an AIS messages as follows
> >> \s:A01-SC084,c:1500862415,t:LIVE*59\!AIVDM,1,1,,A,38;?cf10008aPTl8G3:P090L0P00,0*2F
> >>  
> > 
> > That does not look valid to me.

I've been saying the same thing.  Why ask the same thing and ignore my annswers?

RGDS
GARY
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Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
        gem@rellim.com  Tel:+1 541 382 8588

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