Re: [gpsd-users] Proposed 9600 baud option for gpspipe

[IT1 Stuart Blake Tener, USNR]

Gary,

Let me start off by saying, I respect you thus far for both your  
knowledge and contribution to gpsd. I also agree with you with regard  
to the fact that for gpspipe to have the serial port code vice using  
stty and the "-o" option (or a pipe) when the latter is a far more  
broadly configurable as well as leveraging a fully debugged mechanism,  
removing the serial code is a better way ahead. Indeed it leaves a  
thinner product, less complication, and reduces the need for  
regression testing when new variants of gpspipe are produced in the  
future.

Presuming the GPS is attached to USB0 and the D700 to USB1

I did some testing and realized that I could simply do as follows:

stty -F /dev/ttyUSB0 9600 -parenb cs8 -cstopb
stty -F /dev/ttyUSB1 4800 -parenb cs8 -cstopb

sudo gpspipe -r -o /dev/ttyUSB1

or

sudo gpspipe -r | tee /dev/ttyUSB1

(if I want to see what is going to the D700)

my end testing will probably yield something closer to:

gpspipe -r | grep -v "{" | grep "GPGGA" | tee /dev/ttyUSB1

So as to strip out the initial burst of JSON and to only grab the  
positional data. I'd have more testing to do for that to work.

Now, I am also using a software called Xastir and I realized from  
someone else's wisdom that if I use that then it actually will put the  
D700 in a different mode and do all the work by sending the D700 APRS  
packets and listening to same. So my efforts are kind of moot if I do  
that, but I learned from this as I'd never thought of using stty in  
that way before.

Taking your suggestion into consideration, indeed it seems rather  
superfluous to have code inclusive that does the serial communications  
in gpspipe.

Thank you for the idea.


V/R and 73,

Stuart, N3GWG



--

IT1 Stuart Blake Tener, USNR, N3GWG (Extra), MROP
NR N-NC JTF EAST DET UIC 84245

Las Vegas, NV / Boulder, CO / Philadelphia, PA / Beverly Hills, CA

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e-mail: address@hidden



Quoting "Gary E. Miller" <address@hidden>:

> Yo Stuart!
>
> On Thu, 27 Jun 2013 08:07:10 -0400
> "IT1 Stuart Blake Tener, USNR" <address@hidden> wrote:
>
> > After a quick non invasive look at gpspipe code, I could not see why
> > it spits the first batch of JSON code in "-r" mode (I only figure it
> > must be buried in the libgps code somewhere I guess), however, I was
> > able to generate some code that would offer up the 9600 baud option.
>
> As the original author of gpspipe I'm surprised to see any serial code
> sneak in there at all.  If I had been awake I would have protested
> at the time.  That code does nothing that an stty and a pipe could not
> do WAY better.
>
> Given that someone snuck it in, if you are going to fix it, then
> fix it right.  That means letting the user set any speed from the
> comment line, not jjust 4800 or 9600.  Both are way to slow for any
> modern GPS to send all the data they want to send.
>
> Plus, any code submissions need matching doc updates.
>
> RGDS
> GARY
> ---------------------------------------------------------------------------
> Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97701
>         address@hidden  Tel:+1(541)382-8588