Need Help Adding DFU OTA via SMP (mcumgr) to Android BLE App

[lukan]

Hello everyone,

I’m fairly new to Android development and currently building a BLE app using Kotlin in Android Studio. So far, I’ve managed to implement scanning, connecting to BLE devices, and reading/writing characteristics.

Now, I want to add Direct Firmware Upgrade (DFU) over-the-air using the SMP protocol, similar to what’s implemented in the nRF Connect Device Manager Android app. I understand that the DFU feature can be implemented using the mcumgr library with SMP over BLE, but I’m struggling to integrate it into my project.

I’ve looked at various resources, but I’m finding it difficult to piece everything together. I would really appreciate a step-by-step guide or any support to help me integrate DFU functionality using mcumgr in my app.

Any example code, working implementation, or explanation would be extremely helpful.

Thank you so much in advance!

Regards,

Nakul

[Kenneth]

Hello,

I can check if someone have some pointers.

Kenneth

[Aleksander Nowakowski]

Hello,
First of all, you need to add the dependency to:

implementation 'no.nordicsemi.android:mcumgr-ble:2.5.0

Here you have an example (which is adding this as a library as local project, but replacing this line with the above will also work):

https://github.com/NordicSemiconductor/Android-nRF-Connect-Device-Manager/blob/fc9b6091de37a19e913d90ff87b3a181c616a66f/sample/build.gradle#L81

This dependency gives access to 2 important classes:

McuMgrBleTransport
FirmwareUpdateManager

First, you need to get the `BluetoothDevice`. This is what you get from scanning for Bluetooth LE devices, or having already connected in the app.

You pass this instance to the Firmware Update Manager in the constructor, toghether with a callback.

Before starting DFU set a mode using `setMode`. Usually CONFIRM_ONLY should work.

You need to create the "ImageSet" to pass to the `start` method of the manager. For that you may just copy-paste `ZipPackage` file to your app. It is unpacking the ZIP file generated by the `west build` command and providing the ImageSet object.

Please, follow the rabit in the sample app. I hope that helped!

[lukan]

Hello Aleksander Nowakowski , Kenneth 

Thank you so much for your response, I will follow the instructions as stated above. 

Regards,

Nakul