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fix(pskr): require both ends in CONUS for MQTT subscriptions

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Pin both the sender and receiver DXCC slots to 291 so the broker
only forwards CONUS↔CONUS spots. The previous two-topic-per-band
filter (sender_us OR receiver_us) was leaking US↔CA paths through
the receiver-side wildcard, and the project doesn't have NWP
coverage for the non-US end yet.

When HRDPS lights up we'll add a Canada-anchored topic alongside.
This commit is contained in:
Graham McIntire 2026-05-04 13:07:45 -05:00
parent b924cc2fc2
commit a1f561dfb8
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1 changed files with 9 additions and 12 deletions
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21
lib/microwaveprop/pskr/client.ex
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@ -5,11 +5,11 @@ defmodule Microwaveprop.Pskr.Client do
Connects to `mqtt.pskreporter.info:1883` over plain TCP (the
broker doesn't expose TLS), subscribes to a curated set of
topics, and forwards every PUBLISH payload to
`Pskr.Aggregator.ingest/2`. Each topic anchors on USA (DXCC 291)
on either the sender or receiver side so the broker pre-filters
out the bulk of the firehose before it reaches us — the
alternative would be subscribing to `pskr/filter/v2/#` and
dropping ~95% client-side.
`Pskr.Aggregator.ingest/2`. Each topic anchors **both** ends on
USA (DXCC 291) so we only ingest CONUS-to-CONUS paths — that's
the only path geometry where both endpoints sit inside HRRR
coverage. When HRDPS lights up we'll add a Canada-anchored
topic alongside.
## No external MQTT library
@ -238,18 +238,15 @@ defmodule Microwaveprop.Pskr.Client do
end
defp subscribe_packet(bands) do
topics =
Enum.flat_map(bands, fn band ->
[{topic_for(band, :sender_us), 0}, {topic_for(band, :receiver_us), 0}]
end)
topics = Enum.map(bands, fn band -> {topic_for(band), 0} end)
Mqtt.subscribe(1, topics)
end
# Topic order (from the broker's landing page):
# pskr/filter/v2/<band>/<mode>/<sc>/<rc>/<sl>/<rl>/<sa>/<ra>
defp topic_for(band, :sender_us), do: "pskr/filter/v2/#{band}/+/+/+/+/+/#{@us_dxcc}/+"
defp topic_for(band, :receiver_us), do: "pskr/filter/v2/#{band}/+/+/+/+/+/+/#{@us_dxcc}"
# Both DXCC slots pinned to USA so the broker drops US↔CA, US↔EU,
# etc. before the spots ever reach us.
defp topic_for(band), do: "pskr/filter/v2/#{band}/+/+/+/+/+/#{@us_dxcc}/#{@us_dxcc}"
# ---------- Inbound dispatch ----------