N1SU aprx configuration
N1SU-3

N1SU aprx configuration

Configuration and setup overview by Jason Buchanan

Overview

An example of the configuration I use is shown below. You should be able to use the example by using your call and coordinates.

Take note of these parameters in the example:
filter t/poimqunw for radio source
filter includes the packet types you wish to TX
st are not included and will not be sent to TX
don't use -t/st on radio source (no hyphens)
filter -t/st
for APRSIS source
filter excludes the packet types you wish to TX
st are excluded and will not be sent to TX
msg-path WIDE2-2
via-path WIDE1-1
for APRSIS source
messages are sent WIDE2-2
via packets are sent WIDE1-1
Filter syntax is described at the page for APRS filter commands.
Don't forget to read the aprx manual for more details. The aprx mailing list is a good place to ask aprx questions to a large audience.



On with the show, here's what I use:

aprx.conf

### N1SU example aprx.conf file mycall N0CALL-2 myloc lat 3732.41N lon 11159.72W <aprsis> passcode 12345 server rotate.aprs2.net filter "b/N0CALL* r/37.5401/-111.9952/50" </aprsis> <logging> pidfile /var/run/aprx1200.pid rflog /var/log/aprx/aprx1200-rf.log aprxlog /var/log/aprx/aprx1200.log </logging> <interface> ax25-device $mycall # serial-device /dev/ttyAMA0 19200 8n1 KISS # if you use serial tx-ok true # transmitter enable defaults to false telem-to-is true # set to 'false' to disable </interface> <beacon> beaconmode aprsis cycle-size 14m beacon symbol "I#" lat "3732.41N" lon "11159.72W" comment "N0CALL APRS Digipeater & TX IGate 144.390 http://n0call.com/aprs/" </beacon> <digipeater> transmitter $mycall <source> source $mycall relay-type digipeated # default mode is "digipeated" viscous-delay 5 # (value - 1) + 0 to 2 seconds ratelimit 60 120 # default: average 60 packets/minute, filter t/poimqunw # everything but st </source> <source> # APRSIS source adds a TX-IGATE behavior # Note that APRSIS will only be gated to RF # if the destination station has been heard by # this station within the last hour AND after # aprx was started source APRSIS relay-type third-party # Must define this for APRSIS source! viscous-delay 5 # Recommendation: 5 seconds delay to give # RF delivery time make itself known. # make it 0 or 5 - 5 matches token bucket refill ratelimit 240 480 # I raise this above defaults due to bursts filter -t/st msg-path WIDE2-2 # gate TX with 2 hops for messages via-path WIDE1-1 # gate TX with 1 hop for everything else </source> </digipeater>
Telemetry and status packets are not gated from APRSIS to RF in the example. Remove the filter lines if you need to gate those packets to RF.


aprx FAQ

IssueReason
aprx doesn't transmit a lot
aprx doesn't gate everything to RF
I want aprx to transmit everything
aprx is designed to filter duplicates
viscous-delay is designed to reduce TX by waiting for another digipeater to transmit the packet before aprx transmits it
What is viscous-delay? think of it as "CSMA for packets"
aprx listens for other stations to send the packet
if the packet is not resent then aprx will TX the packet after the delay period
it is designed to reduce TX by allowing other digipeaters to transmit the packet first
What is a good viscous-delay value? 5 seconds is a very polite value
TX will be approximately 4, 5, or 6 seconds
Calculated as (value - 1) + 0 to 2 seconds


More aggressive filtering

Here's some other ways to filter by call or string in the data field, assuming you don't want to use filter -t/st. # APRSIS source filter -b/P1RAT filter -u/D0DE/F3LLER


Or, use the regex-filter parameter:

# APRSIS source, and/or radio source regex-filter source ^.*(P1RAT|D0DE).*$ regex-filter via .*(F3LLER).*$ regex-filter data .*(badword|dirtyword).*$ I avoid regex filters in aprx due to their unintuitive complexity and CPU cost. I prefer the filter parameter instead.




I created a mailing list for APRS UHF discussion, to possibly coordinate a nationwide UHF frequency for APRS, and general APRS digipeater and internet gateway topics.

Enter your email address in the box below to join the group.

The aprx mailing list is a good place to ask aprx questions to a large audience.

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N1SU aprx configuration - Updated: 12-Jul-19
(C) 2019 jsb@digistar.com

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