I have used a few different Bluetooth modules connected to the radio serial interface.
I've connected HC05 and HC08 as well as the much older Roving Network RN41 and RN42 boards.
My Byonics MTT4B (before their Bluetooth module was offered) has an HC05 board in place of the MAX232 chip with the secondary (GPS) pins pass through.? This allows a TTL GPS module to connect on the 6-pin DIN.
NOTE: This is serial data, NOT audio.? APRSIS32 does not accept audio to decode.?
? ? ? ? ? ? That would require Direwolf, AGWpe, or such software which may be able to take Bluetooth audio input.
When creating a new RF port, the device popup offers <TCP/IP>, <Bluetooth>, or <Serial>.
IF your Bluetooth connection has been paired and allows SSP (as Lynn stated), choose <Bluetooth> and you should see the device in the list.
Another "catch" is that newer Bluetooth (my HC08 Bluetooth V4 BLE protocol) have some strange behavior.? Many times they create 2 separate COMM interfaces to the computer.? One is bi-direction (which you need) while the other is receive only.? This has caused some problems that take a bit of troubleshooting, but they still work.
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Robert Giuliano
KB8RCO