Android scan not returning any device

Version

Tell us which versions you are using:

• react-native-ble-manager v6.2.4
• react-native v ^0.55.4
• Android 8.1

Expected behavior

I have a loop that:

• connects to one of many advertising devices
• does some logic (read/write/notify)
• disconnects and move to the next device in the list.
• Once every configured time in between iteration, a scan is invoked to identify devices In case there is a communication error with one device, it is removed from the list (unless, discovered again by a new scan).

This logic should work, even if devices are shut down and restarted, or bluetooth is disabled/enabled,

Actual behavior

I don’t have steps to reproduce, but I have observed (and it may take a couple of minutes or a couple of hours), that suddenly all devices are dropped from the list after failure to communicate, and from that moment on, scan returns 0 peripherals and I fail to communicate with the devices in an endless loop. Bluetooth on/off, does not resolve this, only shutting down the application and opening it again resolves this. When this happens, another app such as light blue (on the same phone, or a different one, can identify all the peripherals correctly).

Steps to reproduce

NA Have tried to pinpoint the issue, but was not able to.

Stack trace and console log

Hint: it would help a lot if you enable the debugger (“Pause on exceptions” in the “Source” panel of Chrome dev tools) and spot the place where the error is thrown

[Sanjeevs1995]

How can one close the issue where a proper solution is not found

[pumpkin123]

I faced the same problem. Some device need LOCATION authority.

Solution: Open LOCATION authority in the device.