Error 8 (0x8) GATT CONN TIMEOUT On Android

[why_do_i_need_a_user_name]

NRF51422 Custom board

SD310 v3.0

Phone: LG K8 4G

Android 6.0

SDK 9.0.0 Boot-loader example

I am testing over the air DFU with our custom device.

a.) DFU using NRF Toolbox on IPhone works fine.

b.) DFU using MCP\NRF51 dongle works fine.

c.) DFU using NRF Toolbox on Android fails with "upload failed GATT error"

nRFConnect on Android can connect with our device but loses the connection after about 6 seconds and the logger captures the following error:

Error 8 (0x8) GATT CONN TIMEOUT

[why_do_i_need_a_user_name]

I have now tested the example boot-loader from SK9 running on a PCA10028 against the LG Android phone.

The DFU fails with "GATT ERROR" reported on the phone.

[why_do_i_need_a_user_name]

Is nrfSniffer compatible with either PCA10031 or PCA10028?

I don't have a nRF51822 Development kit.

[Hung Bui]

Yes, you can use PCA10028 and PCA10031.

[Aser]

Hi I am currently working on the same TIMEOUT error during the same DFU progress. In the meantime, I posted a question on the Dev zone and found this post while waiting for a reply.
As I mentioned above, I changed the interval as shown in the picture below, but still the TIMEOUT error occurred and DFU did not succeed.
Could you help me with this problem?

[Aser]