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APRSMON(8)            Linux Programmer's Manual           APRSMON(8)

       aprsmon - monitor APRS AX.25 traffic for javAPRS

       aprsmon  [-a] [-m] [-r] [-k minutes] [-p port] [-t title] [-i

       Aprsmon uses SOCK_PACKET facilities to provide a network mon‐
       itor of all AX.25 UI text traffic heard by the system.  It is
       based on listen(1).

       Aprsmon collects (-m) or  displays  standard  AX.25  UI  text
       frames  in  a format similar to that output by a standard TNC
       in "Monitor ON" mode and is intended to be used with programs
       like  javAPRS  which wish to see a TNC data stream over a TCP
       connection.  When the aprsmon master has been running  for  a
       while  and  a new aprsmon slave starts up, first all saved up
       reports are sent, then a title line indicating the  beginning
       of live data is sent, and new reports are sent as received.

       Compressed position and telemetry reports as generated by the
       APRS Mic Encoder are translated into the conventional  uncom‐
       pressed  APRS Micro-Interface-Module (MIM) telemtry format so
       that these stations are visible in javAPRS.  Reports contain‐
       ing  a TheNet X1J4 beacon header are also edited to strip off
       the header making these nodes visible in javAPRS as well.

       -a        Allow for the monitoring of outgoing frames as well
                 as incoming ones.

       -r        Choose  "raw"  mode which allows non-printable data

       -p port   Monitor only those frames received on a  particular
                 port,  by  default  all  AX.25 interfaces are moni‐

       -m        "Master" mode.  Retain monitored data for the  num‐
                 ber  of  minutes  specified with the -k option in a
                 shared memory segment.

       -k minutes
                 Retain monitored packets going back the given  num‐
                 ber of minutes.  Default is 30.

       -t title  Sets  the  javAPRS  title string.  Default is "Live
                 data from Linux."

       -i infofile
                 Infofile is the path to the file that  the  aprsmon
                 master  writes  the shared memory segment and sema‐
                 phore      id's       into.        Default       is

       Set  up  one aprsmon master running on your system to collect
       historical data going back a while.  You will  probably  want
       to set up an /etc/rc.d/init.d script for this.

       aprsmon -a -m&

       Add an entry into /etc/services with the port number you want
       javAPRS to connect on.  For example:

       aprs      14439/tcp # APRS monitor on 144.39

       Add an entry into /etc/inetd.conf for this service:

       aprs stream tcp nowait root /usr/sbin/aprsmon aprsmon -a

       To  test,  simply  "telnet  localhost  aprs".   To  use  with
       javAPRS, set, for example,

       <PARAM name = "dataFile1" value = "netc:14439:localhost">
       in  your HTML file as described in the javAPRS documentation,
       and then use appletviewer to run javAPRS:
       appletviewer mydemo.html

Mic-E to MIM Translation
       The Mic-E reduces the duration of packet  noise  on  a  voice
       frequency  by encoding its data in a compressed form, some of
       which  is  binary.   Some  APRS-decoding  software,   notably
       javAPRS,  is  unable  to  deal with this data.  To solve this
       problem aprsmon expands the Mic-E packet into one or two  MIM
       packets as follows:


       ddhhmm    is  the UTC day and time the packet was received by
                 the host running aprsmon.

       DDMM.hhN  is the latitude.

       /         is the symbol table selection (/ or \).

       DDDMM.hhW is the longitude.

       $         is the symbol.

       cse,spd   are course and speed.

       E         is the type of Mic-Encoder:

                 E - TAPR Mic-Encoder
                 T - Kenwood TH-D7

       m         is the status message number, and

       status    is the status message number expanded as follows:

                 0 -  Off duty..
                 1 -  Enroute...
                 2 -  In Service
                 3 -  Returning.
                 4 -  Committed.
                 5 -  Special...
                 6 -  PRIORITY..
                 7 -  EMERGENCY.

                 are the values of the telemetry channels.

       /etc/ax25/axports /var/ax25/

       call(1),   listen(1),   beacon(1),   ax25(4),    axattach(8),,,,         MIC-

       Alan Crosswell,

Linux                      9 February 1999                APRSMON(8)
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