[aprssig] WXBOT -- weather forecast via APRS Message

Robert Bruninga bruninga at usna.edu
Wed Feb 3 08:21:40 CST 2016


Give me the tip on how to turn off CWOP stations on APRS.FI.  I never can
find it and hate the sea of blue...  Bob

-----Original Message-----
From: aprssig [mailto:aprssig-bounces at tapr.org] On Behalf Of Greg Troxel via
aprssig
Sent: Wednesday, February 03, 2016 8:32 AM
To: Steve Dimse
Cc: TAPR APRS Mailing List
Subject: Re: [aprssig] WXBOT -- weather forecast via APRS Message

Steve Dimse <steve at dimse.com> writes:

> There is no brittleness caused by dup removal, other than to paths,

Sorry, that's not what I meant.  I did not mean to say that dup removal is a
cause of brittleness, but that the culture of direct injection together with
dup filtering makes it difficult to detect brittleness.

When weather data, or anything else, is sent by Internet direct injection,
then when the Internet fails to function, the data will not get through.
Around me, people with cable modems, even if they have backup power at home,
lose Internet about 1h after loss of utility power.

Right now, as far as I can tell, there is no easy way to tell (from
APRS-IS) whether data is also sent over the air and thus would be available
in the event of infrastructure failure, or whether it is Internet only.
This strikes me as the same issue with the satgate discussion, where people
don't want to disseminate the data by all available means, but to know if it
is working by one of the possible means.  I think survivability is
important, and therefore that both enhancing survivability and enabling
understanding whether the property holds are important design
considerations.

But I see from your note that CWOP is separate (presumably a parallel
CWOP-IS, which display sites merge in); I hadn't realized that.  On aprs.fi,
selecting "APRS stations" and deselecting weather still shows non-amateur
CWOP.  So presumably that's an aprs.fi bug (or lack of feature, if "APRS"
means "data from some IS using the APRS protocol", rather than meaning "the
Amateur APRS network").
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