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This is derived from the
javAPRSFilter Users Guide. All commands to javAPRSFilter start with
the word "filter" and followed by one or more filter specifications. For
instance, to specify all packets near Dallas Texas plus all NWS bulletins, you
would use the following line:
filter r/33/-97/200 t/n
The default filter is not to pass anything in addition to what javAPRSSrvr will
pass. So a user-defined filter port (14580) will pass messages to the client and
any gated station, and nothing else until a filter definition is added. Multiple
filter definitions can be setup separated by spaces. If any of the filters find
a match the packet is passed.
With javAPRSFilter 3.0, you can prevent the filter from passing certain packets
by prefixing the filter parameter with a hyphen (-). This tells the filter to
approve any packets that match the include filters except those that
match the exclude filters. Standard port functionality such as messaging for
IGates is not affected.
For instance, to get all stations within 200 km of me except stations with the
prefix of CW, I would use:
filter m/200 -p/CW
javAPRSFilter 3.0 also allows you to use decimal degrees for latitude and
3.1 added the e & u filters, the radius specification for the t filter, and
wildcards for the d filter. 3.1 also added the command "filter default"
which resets the filter to the predefined filter for that port.
You can check the version of javAPRSFilter that the server is using by accessing
its status page, usually on port 14501 (for instance,
http://first.aprs.net:14501 ).
The status page is also a good way to verify that all of your filter was
accepted.
The filter command may be set as part of the login line, as an APRS message to
SERVER, or as a separate comment line (#filter r/33/-97/200). The prefered
method is to set the command as part of the login which is supported by most
current APRS software.
Below are the available filters:
|
Parameter |
Filter Type |
Description |
|
r/lat/lon/dist |
Range filter |
Pass posits and objects within dist km from lat/lon.
lat and lon are signed degrees, i.e. negative for West/South and positive for
East/North. Up to 9 range filters can be defined at the same time to allow
better coverage. Messages addressed to stations within the range are also
passed. |
|
p/aa/bb/cc... |
Prefix filter |
Pass traffic with fromCall that start with
aa or bb or cc... |
|
b/call1/call2... |
Budlist filter |
Pass all traffic from exact call: call1, call2, ... (* wild card allowed) |
|
o/obj1/obj2... |
Object filter |
Pass all objects with the exact name of obj1, obj2, ... (* wild card allowed) |
|
t/poimqstunw
t/poimqstu/call/km
|
Type filter |
Pass all traffic based on packet type.
One or more types can be defined at the same time, t/otq is a valid definition.
p = Position packets
o = Objects
i = Items
m = Message
q = Query
s = Status
t = Telemetry
u = User-defined
n = NWS Weather & Weather Objects
w = Weather
Note: The weather type filter also passes positions packets for positionless
weather packets.
The second format allows putting a radius limit around "call" (station
callsign-SSID or object name) for the requested station types.
|
|
s/pri/alt/over |
Symbol filter |
pri = symbols in primary table
alt = symbols in alternate table
over = overlay character (case sensitive)
For example:
s/-> This will pass all House and Car
symbols (primary table)
s//# This will pass all Digi with or without
overlay
s//#/T This will pass all Digi with overlay of capital T
|
|
d/digi1/digi2... |
Digipeater filter |
The digipeater filter will pass all packets that have been digipeated by a
particular station(s) (the station's call is in the path). This filter allows
the * wildcard. |
|
a/latN/lonW/latS/lonE |
Area filter |
The area filter works the same as rang filter but the filter is defined as a box
of coordinates. The coordinates can also been seen as upper left coordinate and
lower right. Lat/lon are decimal degrees. South and west are negative. Up to 9
area filters can be defined at the same time. |
|
e/call1/call1/... |
Entry station filter |
This filter passes all packets with the specified callsign-SSID(s) immediately
following the q construct. This allows filtering based on receiving IGate,
etc. Supports * wildcard. |
|
u/unproto1/unproto2/... |
Unproto filter |
This filter passes all packets with the specified destination callsign-SSID(s)
(also known as the To call or unproto call). Supports * wildcard. |
|
q/con/ana |
q Contruct filter |
q = q Construct command
con = list of q Construct to pass (case sensitive)
ana = analysis based on q Construct.
I = Pass positions from IGATES identified by qAr or qAR.
For example:
q/C Pass all traffic with qAC
q/rR Pass all traffic with qAr or qAR
q//I Pass all position packets from IGATES identified in
other packets by qAr or qAR
|
|
m/dist |
My Range filter |
This is the same as the range filter except that the center is defined as the
last known position of the logged in client. |
|
f/call/dist |
Friend Range filter |
This is the same as the range filter except that the center is defined as the
last known position of call. Up to 9 friend filters can be defined at the same
time. |
|