Android Question Bluetooth SPP Pairing Fails

[Dane du Plooy]

I have a project using BT SPP. If I try pair to a device (ESP32) from the B4A app (using simply Serial.Connect) then it apparently pairs (listed in the "paired" list in Android BT Settings), but I cannot connect to it (either from the B4A app or from a separate terminal app). If however I pair from Android BT Settings then it works fine and I can connect from both B4A and the terminal app. How can I get devices to pair properly from B4A?