Re: [gpsd-dev] Fw: [gpsd-commit-watch] [SCM] GPSD branch, master, updated. dev-3.19a-435-g7fc42e4

[Fred Wright]

On Thu, 28 Mar 2019, Gary E. Miller wrote:

> Thanks for the ubxtool patches!  As you correctly note, it is a very
> young tool.  Many things were just thrown together and could be much
> improved.  More to come when I get a u-blox 9.
>
> One comment:
>
>    Note that the baud rate is only applicable to the UART port, so
>    there's no point in applying this to the -S option.
>
> Newer u-blox may have two serial ports.  So in some cases it would
> need to apply to the -S as well.

I considered that possibility, but as yet there's no readily available 
documentation covering such receivers.  In particular, if any protocol 
documentation for the 9 series exists at all, it's not published on their 
website.

I wouldn't be surprised if port ID 2 is for a second UART port, but it's 
not yet documented.  It would be easy enough to add that.

I sometimes see "reserved" values in the USB port which look suspiciously 
like the flags and baud rate for a UART port.  I suspect that this is due 
to GPSD itself indiscriminately setting them.  It's technically illegal to 
send nonzero values for reserved fields, but what the receiver appears to 
do in this case is just set and echo the values, while probably completely 
ignoring them internally.  This is one of a few "not new" GPSD UBX-related 
bugs that I'll probably look at after chasing the new bug I reported 
earlier.

Fred Wright