Bluetooth Variation by Country? DFU problems by Location

RE: Bluetooth Variation by Country? DFU problems by Location

Hung Bui — Wed, 14 Oct 2015 10:20:48 GMT

Hi Paul,

But this doesn't explain why when you send the same device from US to UK it failed. I would be surprised if the phone changes the behaviour when changing the location.

I agree that this is most likely the issue with the buffer, please check and make sure you have this:

#define TX_BUF_SIZE       4u    /**< TX buffer size in bytes. */
#define RX_BUF_SIZE       32u   /**< RX buffer size in bytes. */

#define RX_BUF_QUEUE_SIZE 8u    /**< RX buffer element size. */

in your hci_mem_pool_internal.h file in your project.

A sniffer trace of an unsuccessful DFU transaction would tell more about the issue.

We don't have any issue with iOS devices we have in house (dozens of them), number of DFU packets =10. It would be interesting if you can send one of your iOS device to us (Norway) or you can contact our Sale/FAE in your location, we have FAEs in the US. Let me know if you don't have the contact.

RE: Bluetooth Variation by Country? DFU problems by Location

Paul — Wed, 14 Oct 2015 04:46:44 GMT

Changing DFU Number of Packets to 1 makes it work across both platforms. Setting it to 5 breaks on both platforms. Setting it to 2 works on the UK phones but not the US. Perhaps something else at work here but we've traced it to a buffer size issue and can code around it.

Somewhat unsatisfactory solution.

RE: Bluetooth Variation by Country? DFU problems by Location

Hung Bui — Tue, 29 Sep 2015 08:07:48 GMT

Hi Paul,

This sounds really really strange.

We would need the sniffer trace from the failure trials to understand what happened. If you can also record successful update, it would be nice.

With the sniffer trace, we can find what is the data rate (connection interval and number of packet per connection event) But I don't think they are varied.

I am wondering did you also send the nRF51 board with the ipod/iphone you used or you sent only the central devices and tested them with different nRF51 board.

My suspicion is with the ATT caching issue. How did you test them ? Did you test them with the bootloader only or with your application and buttonless mechanism to jump to bootloader ?

Have you made sure you didn't modify anything in the bootloader in the SDK ?