to stations heard in local RF,
• “Message path” - default path applied to message packets forwarded from APRS-
IS to RF,
• “Local RF heard max. digi-hops” - stations which packets were received after
being digipeated by numer of digipeaters not higher than defined in this field, will
be considered as stations in local RF,
• “Local RF heard buffer timeout [m]” - determines the time (in minutes) after
which stations heard from local RF are removed from the “local RF heard” buffer.
Difference between local RF heard buffer and RF heard buffer is that:
1) Local RF heard buffer stores station callsigns heard within limited number of digi-
hops,
2) RF buffer stores all other station callsigns heard from RF.
Local RF heard stations can be recipients of messages because they are located nearby,
and RF heard stations can't be recipients of messages because, although heard from RF,
they are located too far.
We need to store callsigns of stations heard from local RF because:
1) Only these stations can be recipients of message packets.
2) When a message packet sender is heard by our station from local RF, then its message
shouldn't be forwarded from APRS-IS to RF (because we heard this station before from
local RF so it is somewhere nearby and probably has already sent the same message
packet directly to RF).
10.9.5. APRS-IS gateway / APRS-IS->RF (non-messages)
• “Gate non-message packets to RF” - if enabled, non-message packets will be
forwarded from APRS-IS to RF based on a filter rules discussed below,
• “Non-message path” - default path applied to non-message packets forwarded
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