matt on 04 May, 2018 09:35 PM
Edit the sar.properties file and add the following:
After that it will listen for APRS data (text out of a TNC, not KISS format) on attached serial ports. On a saved map, you need to do Add New -> Add Locator, type APRS. The interface is a little odd for APRS since it's designed to work with a number of different tools, but you need a separate locator group for each callsign (not counting -XX SSIDs), so it's easiest if you can use a single team callsign with different SSIDs for each member, inserting the operator callsign into the comments section of the packet if needed.
Local APRS traffic that doesn't match an existing locator group should show up in a "callsign" folder on your map, to give you a sense of traffic that you're not tracking.
Does anyone have recommendations for a radio for SarTopo / APRS? I was about to get a Kenwood TM-D710GA, but realize it has a serial output - sounds like another point of failure going from a serial port to USB.... Curious if a Yaesu FTM400 with USB port would work just as well?
matt on 09 May, 2018 05:51 AM
I'm not familiar with that radio. I also don't have time to digest this entire thread, but if there isn't a way to stop the radio from adding line breaks in the middle of a position report, that's not something I see myself handling any time soon. The serial port code is shared with other uses such as FleetSync, and it's all based on carriage-return terminated lines.
You said "No, as long as the TNC is putting out text similar to what goes out over APRS-IS (ie not KISS, sorry, I'm not up on the exact terminology at the moment)." Everything I'm seeing seems to indicate all the radios to computer interfaces use KISS.
I'm worried about going for a Kenwood TM-DM710GA for this purpose, finding out that I can only use KISS and it won't work with SarTopo. Am I worried over nothing and people have use this combination successfully?
matt on 16 May, 2018 04:31 PM
Most radios support KISS as a mode; it looks like the Kenwood also provides other output formats that SARTopo should be able to read, but I'm having trouble finding sample packet data online that I could plug into my program to verify.
I ended up not having luck with the Kenwood TM-D700.
Purchased a Kenwood TM-710GA and it works perfectly! One key difference I found is a field on the Kenwood software that read "PC Port" and "PC Output" - on the RT Systems software that reads "COM Port Output" that worked perfectly.
One thing I noticed is to be careful not to go switching the serial cable too much. The PC side and the radio side can get to the point where they aren't talking well... If that happens, rebooting the server on the PC and cycling power on the radio seems to help.
We had an event locally where we got to tinker with the SAR Topo Offline and APRS - One issue we kept running across is units that weren't tracking or the status freezing. I found it I shut down the browser and the server and restarted everythink it would not only work again but it would seem to catch up with what we weren't seeing while the display was frozen.
matt on 18 Sep, 2018 09:31 PM
I don't have anything new to report on this, but a significant portion of the location tracking code has been rewritten. So 1) the issue may no longer exist, particularly if you can't replicate it on sartopo.com using APRS-IS locators and 2) when you upgrade the latest offline version, be careful to test the local APRS part as there might be bugs that haven't been found yet (I don't have a lot of testing resources for this).