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weliem / blessed-android

BLESSED, a Bluetooth Low Energy (BLE) library for Android
MIT License
557 stars 119 forks source link

2 pairing dialogs on Nonin 3230 first connection #125

Closed boyks closed 3 years ago

boyks commented 3 years ago

Device: Pixel 4a OS: Android 12

When connecting to the Nonin 3230 device for the first time, I need to confirm pairing 2 times on the system pop-up dialog. As far as I understand, the Nonin device requires bonding for a secure connection, thus requesting pairing with the device. But why 2 same dialogs?

weliem commented 3 years ago

It's an Android bug. It happens on some phone but not all.

The workaround is to call createBond() instead of connectGatt() if the device is not bonded yet.

In the example app of this library, this is done for the Contour glucose meter.

weliem commented 3 years ago

Any progress on this?

boyks commented 3 years ago

Yeah. Tried implementing my own stack based on your example, and indeed calling createBond() fixes the problem, but not calling it instead connectGatt(), but just before it, then listening to bond changes.

Also have limited this workaround to Google (Pixel) and Samsung devices, not sure though if it's enough - will wait for responses from users.