How to send more than 20 bytes of data with 1.2.0 ? about android-ble-library HOT 7 CLOSED

In 1.2.0, what I would do, is to split data before calling writeCharacteristic and then call it multiple times. You may find an example in nRF Toolbox all in bleLib1 branch in UartManager.

from android-ble-library.

A link: https://github.com/NordicSemiconductor/Android-nRF-Toolbox/blob/ble_lib/1.x/app/src/main/java/no/nordicsemi/android/nrftoolbox/uart/UARTManager.java

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Thank you very much.

from android-ble-library.

Hi,

Sorry to keep bothering you. In our project, we only need for client (Android phone) to communicate with one type of server (device) through BLE. I have also verified that I can make the packet size larger through request_mtu(517) up to 514 (517 - 3) both for client (min sdk is Lollipop) and the server (device). So what do you think about enlarging the packet size up to 514 first and send/receive data. If the data size is bigger than 514, can I still chop it to many packets through queue? Does that sound reasonable with Android-BLE-Library 1.2.0 ? Or mtu should be only 23 (20 available) for chopping the data to many packets?

Thanks.

from android-ble-library.

Yes, you may use Android-BLE-Library 1.2.0. Longer MTU (higher than 23) is supported on Android since Android 5 Lollipop. Use the requestMtu method to request higher MTU. You should get a callback when MTU selected.

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Longer MTUs must also be supported by the other side. The callback will give you the MTU both side have agreed on.

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Thanks again. ;)

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