Fujifilm scan sometimes not reliable if initiated before camera pairing

[gkoh]

With v3.0.0-rc4 I can semi-reproduce the scan issue.

If Scan is enabled, then left for 'some time', a Fujifilm camera that is then set to pair does not appear.

From the debug, the NimBLE stack definitely picks up the new advertising device, but for some reason the callback to add it to the menu doesn't happen.

Need to investigate further.

FYI @matthudsonau

[gkoh]

I've found one way to reproduce:

• pair camera
• delete from furble
• start scan
• start camera
  • realise old pair is still on camera
  • delete from camera
• start pairing
• doesn't show up

This happens because the camera starts and immediately tries to connect to furble, but the scan data doesn't include the pair information. As the scan filter drops duplicates based on Bluetooth MAC address, it never shows again.

[gkoh]

Hmm, I cannot reproduce this any other way.
Leaving this here to keep an eye on it.