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android noob here!
Is there a difference between when two android devices (smartphones) are 'paired' and when they're 'connected'? If so, what is the difference when transferring data from one to the other?
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What's Bluetooth pairing? Bluetooth pairing is a form of information registration for linking devices. By registering device information (pairing) between devices, they can connect. To use a Bluetooth device, you must first pair it with another Bluetooth device. Pairing is a bit like exchanging phone numbers.
Try unpairing, then re-pairing, the device. To unpair a device, select Start , then select Settings > Devices > Bluetooth & other devices . Select the Bluetooth device that's paired but not working, then select Remove device > Yes. After that, pair the device again.
On devices running Android 8.0 (API level 26) and higher, companion device pairing performs a Bluetooth or Wi-Fi scan of nearby devices on behalf of your app without requiring the ACCESS_FINE_LOCATION permission. This helps maximize user privacy protections.
Please imagine yourself in such a situation:
You come to car with BT audio system first time.
You are not paired and not connected.
You pair the devices and because you are close to the car you immediately connecting. But when you go to home and you are away from car you are disconnected but paired. When you come close to the car again, you don't need pair, you don't need put pin again to pair the devices
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