NRF connect doesn't reconnect when phone bluetooth is turned off and then back to on again

[Prasad]

I connect to my BLE peripheral device using NRF connect app. While in connection, if I switch my phone's bluetooth off and turn it back again and then try to connect to my device then it doesn't connect. If I go to the "scanner" tab and do a scan, I observed that my device is advertising. When I press the connect button from the scanner screen then NRF connect connects to my device.

Why is NRF connect not able to connect when I press the connect button(upper right corner button) on the device's tab? And what happens when I do a scan, after which I am able to connect to my device?

OS: Android nugget on Motorola C.

[Hung Bui]

I don't see that issue on my phone (Galaxy S8) . I was suspecting the BluetoothDevice instance was not free-ed up after the disconnection caused by turning off BLE on your phone. When you switch to scan panel, the instance is killed and new instance used to connect when you press connect there.

But then it should show the same thing on my phone. It didn't.

Have you updated the nRF Connect to latest version ?

When you turn off Bluetooth have you waited long enough so the status on nRFConnect says "Disconnected" ?

[Prasad]

My nrfconnect application version is 4.12.0, I think this is the latest available. Yes, I am waiting long enough. Actually when I turn off bluetooth, "enable" button appears on nrfconnect and not the connection status. My peripheral device also indicates that it is in disconnected state and it is advertising.

I tested this issue on Motorola E phone as well, this issue doesnt occur on Moto E.

[Prasad]

I got my hands on a samsung J7 phone. As you said the issue doesn't appear on this phone. I guess this issue isn't there for samsung phones.

[Hung Bui]

We haven't heard others complain about this issue. I would assume that it's only on a some particular phones (or only Motorola C) that having this issue.

[Prasad]

I am observing this issue on Moto G3 as well(Android marshmallow). Can anyone please let me know what is going on in NRF connect when I refresh the scan screen due to which I am able to connect again to the devices?