[aprssig] APRS-IS and metadata

Lynn W Deffenbaugh (Mr) KJ4ERJ at arrl.net
Thu Aug 17 23:21:22 EDT 2023

Yes, anyone can put whatever they want in the comment section of THEIR 
OWN packets.  IGates and digipeaters MUST NOT modify the packet except 
as provided in the path section for their particular operations.  The 
source, destination, and payload of packets must not be modified as the 
packet traverses the RF and APRS-IS networks.

Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32

On 8/17/2023 5:52 PM, Bob Poortinga wrote:
> Nothing prevents you from using the free text comment section of an 
> APRS position report, object, or status packet for your own needs. 
> Create a software parsable format that is distinct (e.g. starting the 
> comment with "&&") and stuff your meta data there.
> Bob W9IZ
> On Thu, Aug 17, 2023, 4:14 AM Borja Marcos <ea2ekh at gmail.com> wrote:
>     Hi,
>     I am new to the list, I hope this is the right place to discuss
>     this issue. This is not a complete proposal, of course,
>     just a “weather balloon” ;)
>     As many members will be aware, there is an effort underway to use
>     LoRa modulation on 433 MHz for
>     APRS. There are several open source projects which, as a plus, are
>     based on dirt cheap and easy to obtain
>     hardware,
>     https://github.com/richonguzman/LoRa_APRS_Tracker
>     https://github.com/dl9sau/TTGO-T-Beam-LoRa-APRS
>     https://github.com/lora-aprs/LoRa_APRS_iGate
>     There is also one commercial product available, picoAPRS LoRa. It
>     is more pricey, but, well, all of us know
>     that developing and supporting an actual product is hard.
>     http://www.db1nto.de/index_en.php
>     All of it is a bit ad-hoc now with no agreed standards (as far as
>     I know). While some of the developers have
>     agree informally to use APL?? device IDs for LoRa based equipment,
>     not every developer is following that
>     rule,
>     As far as I know there are also other modems/phys used with APRS.
>     For example VARA on HF.
>     I think it would be great to add some metadata to the databses
>     used by the APRS mapping applications including,
>     as a minimum, a modem/phy identification (and frequency, which
>     could be useful for HF) so that they can be
>     more useful to study/check certain kinds of APRS activity.
>     Right now, for example, there are dashboards relying just on
>     APL??? device IDs.
>     http://lora.ham-radio-op.net/?center=43.3508,-3.0499&zoom=12
>     <http://lora.ham-radio-op.net/?center=43.3508,-3.0499&zoom=12>
>     Another interesting possibility offered by a more flexible
>     database model could be adding some metadata specific
>     to certain modems. As an example, LoRa chips can provide RSSI and
>     SNR data which could prove valuable for
>     propagation/coverage studies.
>     What do you think?
>     73,
>     Borja Marcos / EA2EKH
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