Trying to set BLE device on DFU mode - Get error status 253 on onCharacteristicWrite function

[Valentin Laurent]

Hello,

I'm trying to set my device on DFU mode by an android mobile application without success. I'm working with nrf51822, sdk10, softdevice 8.0.

I subcribe to the DFU Control Point characteristic (Activate Notification). But when I'm trying to write on the same characteristic, it doesn't switch my device on DFU mode and I receive an error status 253 in the function onCharacteristicWrite.

Can you help me or give me some advices ?

Thank you a lot.

[Vidar Berg]

Hello, are you using nrf toolbox/ master control panel?

[Valentin Laurent]

Yes :)

I finally resolved my problem, I'll will give some details about my solution.

[craig_j]

What where you doing wrong#? I'm getting the same error message (253) trying to write to a device. Noob at bluetooth so no idea whats wrong.

[Rish]

For a successful DFU Characteristic write, after connection one needs to discover services, enable notifications and in the onDescriptorWrite callback the characteristic should be written and the BLE device will start advertising as DFU Target after disconnecting.

[Abe]

You need to enable the notifications for DFU Packet Characteristic(1531 UUID) in the DFU Service (1530 UUID), in order to write to the control point. The device will disconnect automatically and will start advertising as DfuTarg with the DFU service UUID(1530). Connect, discover and enable notification, after which you can start the upload process.