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Bluetooth HCI snoop log analyzer for Mac? (GATT_INTERNAL_ERROR)

Is there a good Mac log analyzer for Android's btsnoop_HCI.log file?

I'm trying to debug an Error 0x81 (GATT_INTERNAL_ERROR) that is being returned when I try to write characteristic 2a52 (the Record Access Control Point) in a Glucose Meter.

The Internet says that 0x81 is a "generic error", which is not much help in figuring out the cause.

I've tried inserting delays between successive BLE operations but it hasn't helped.

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