CODEWITHSUNDEEP
androidbluetoothbluetooth-lowenergy
Android_dev
Android_dev

Reputation: 101

Understanding PHY_LE_1M vs PHY_LE_1M_MASK in Android

I have a Bluetooth Low Energy device(smartwatch) that works on BLE v4.1 and am developing an Android application for the same.

I have basic understanding related to BLE PHY but couldn't find anything related to PHY LE 1M and PHY LE 1M MASK. There is a brief here in Android app about PHY_LE_1M and PHY_LE_1M_MASK but couldn't understand it well.

Can you please share some details related to the same? I want to use it in connect method here.

Also what is the default selection in Android if not specified and do I have to specify the same? Main concern is because the device in BLE v4.1 and commonly used BLE in phones are v4.2 and v5.0 as I have found for now.

Upvotes: 3

Views: 1428

Answers (1)

Codo
Codo

Reputation: 78835

The easiest approach is probably to pass 0 as the phy parameter (the same as passing PHY_OPTION_NO_PREFERRED, which evaluates to 0 as well).

If you want to specify an explicit transmission mode, use PHY_LE_1M_MASK as it is the only one supported by BLE 4. The other ones have been introduced with BLE 5.

The constants ending in _MASK seem to be for use in connectGatt while the constants without _MASK are for use in onPhyUpdate.

I don't know what the default transmission mode / PHY is. It might be LE 1M, or it might be determined once more information about the BLE device is available.

Upvotes: 4

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