HI Mariko,
You will get Bearingless target ‘Ring’ alerts on SD using the ‘Flarm’ (TCP) connection just the same as if using the ‘PilotAware’ (UDP) connection. The main difference is IIRC that if the ‘Flarm’ connection drops out it has to be manually reconnected, whereas the ‘PilotAware’ (UDP) option should reconnect automatically (as long as the PAW signal is still present).
Matt,
Several questions here. You say you are running 20190621 on a ‘Raspberry Pi’. Is this a ‘Home Built’ unit or a bought one? If bought, is it a PAW Classic or Rosetta? If Homebuilt, which Raspberry Pi are you using? How is it powered? What make/model of tablet are you using?
On the face of it, this sounds like a problem with the WiFi link between your pad and your PilotAware. This can happen, for example, when the power feed drops when starting your engine and during the period when your PilotAware is rebooting, your pad may have reconnected to another WiFi link, such as in the Clubhouse - with no PilotAware feed. I saw this yesterday with a mate’s unit which did just that. Unaware of what was going on he realised was unable to get PAW going for his flight and so reverted to using ‘Location Services’ which gave position but of course no traffic info. I advise always rechecking that your tablet (or other device) is still connected to your own PilotAware after engine start and before takeoff.
Another possibility is the WiFi connection itself. We have seen issues in the past with a couple of PAW / tablet combinations, though these are rare. There was an issue several years back for example where some users of the Google Nexus 2012 version found that their tablets refused to connect if the units were close together because the WiFi power was too high, though mine was always fine (I now mainly use an iPad Mini BTW). There have also been one or two isolated reports of connection difficulties with IIRC specific Lenovo tablets and possibly a particular Samsung model, but this is extremely rare. You can experiment with the WiFi transmit power setting in the PAW / Networks setup tab, but take note of the base settings first, make any adjustments in small steps and be aware that the unit has to reboot each time for the change to take effect ( so make sure your tablet is still properly connected after each reboot).
Let us know how you get on.
Regards
Peter