Re: [gpsd-users] parsing NMEA PASHR record

[Roger Oberholtzer]

Just an update on the PASHR parsing: we had no trouble doing the PASHR parsing. 
That part is easy. The problem we have is that PASHR records trigger a new 
report cycle. Which is not what we want. In our systems, records like GGA 
arrive at 10 Hz, and PASHR at 25 Hz. This is by design. Because of this, we 
have disabled PASHR parsing by gpsd and instead parse it our self via the raw 
NMEA stream we get from gpsd. We could of course pass our parsing code to you, 
but we would probably disable it anyway. In fact, the general way that gpsd 
determines report cycles is, in our opinion, rather draconian and not really 
suitable for many uses. We have backed off using gpsd parsed NMEA data (both 
via JSON and shared memory) for this reason. But we are very happy with it as a 
way to provide data to set the PC time (we use chrony) and to share the gps 
data among numerous applications.

So, it you want the PASHR parsing code, I can send you the diffs. Many systems 
will, I think, then have unexpected side effects.

Still a happy gpsd user.

________________________________________
From: gpsd-users address@hidden on behalf of Gary E. Miller address@hidden
Sent: Wednesday, December 20, 2017 9:08 PM
To: address@hidden
Subject: Re: [gpsd-users] parsing NMEA PASHR record

Yo Roger!

> I hear that.  I'm taking Thursday afternoon off to get a nice fresh Christmas 
> Tree!  I live in Oregon, we grow the best!

I'm in Sweden, where the Christmas trees are also pretty good! When my daughter 
gets home from University we will go tree hunting.

> I'm all about testing.  Which is why I'm also asking for sample input files 
> so regression tests get added at the same time as the code.
>
> Have you run the existing regression tests with the patch?

No. I will do so.

Roger Oberholtzer

RST Systems

Office: +46 (0)10-615 6020
Mobile: +46 (0)70-815 1696
address@hidden
________________________________________

Ramböll Sverige AB
Krukmakargatan 21
P.O. Box 17009
SE-104 62 Stockholm, Sweden
www.rambollrst.se