I have exactly the same config.
Garrecht Air Avionics send trafic to my G3X.
But in order for SafeSky to work properly, you need to cut the WIFI from the tablet to Air Avionics. This is because your tablet connects to Air Avionics’ WIFI network, which does not have mobile Internet access. This means that SafeSky will not work.
While SafeSky is compatible with SkyEcho, Pilot Aware and Satrtux, it doesn’t work with Garrecht. If you ask them, it’s on their side.
So to date, there is no possibility of coupling with AirAvionics.
Personally, the difference in traffic perceived by one and the other is indisputable. SAfeSky gives much more information than Garrecht (from my own experience), but having the two working in parallel is always a good thing. That’s what I do personally,
As mentioned already, there are two choices to make when trying to add Air Avionics AT-1 as an External Device in SafeSky. The first is the “WiFi Interface Protocol” to use for AT-1 output, options being NMEA, GARMIN TIS, GDL90, and ABSOLUTE TEXT.
The second is which External Device to pick inside SafeSky, e.g. PowerFLARM or GDL90.
I can confirm NMEA (default) + PowerFLARM doesn’t work. And a previous post here (2 years ago) said that GDL90 on both sides also doesn’t work. Is this still the case today?
The iPad is able to be connected to the AT-1 WiFi and use mobile data for Internet, this is not an issue (you may need to set a manual IP and remove the router info in settings).