when I start a DFU procedure the device is advertising empty packets

RE: when I start a DFU procedure the device is advertising empty packets

Hung Bui — Tue, 22 Sep 2015 22:35:53 GMT

Hi M.Anis,

I just tested and found that the empty packet you spotted was the directed advertising ! When advertising with directed mode, the adverting data is empty, the advertising packet has only the peer address. (this is described in Testing the example manually (with Bonding) )

I think it's a bug with the bootloader now, that it will advertise in directed mode even the application has not bonded with the phone. I will check with the developer.

I'm sorry that I didn't spot this earlier.

By advertising in directed mode with no change in the address, there is a chance that the ATT table will not be refresh (no service discovery from the phone) when switching to bootloader. However it's not a problem with Master Control Panel and nRFToolbox app, because we clear the att table every time we disconnect from the application.

You can simply connect and do DFU as you did with bootloader when starting with a button press.

RE: when I start a DFU procedure the device is advertising empty packets

M.Anis — Tue, 22 Sep 2015 07:11:44 GMT

please try the files now

RE: when I start a DFU procedure the device is advertising empty packets

Hung Bui — Tue, 22 Sep 2015 06:35:56 GMT

Hi Anis,

Seems that file ble_app_hrs.rar has an issue with it, when I click it, It was the nrfjprog_win.sh instead. Could you try to re-upload the ble_app_hrs.rar file ? The nrfjprog.exe tool is located at C:\Program Files (x86)\Nordic Semiconductor\nrf5x\bin. You should have it after you installed nrfTools.

RE: when I start a DFU procedure the device is advertising empty packets

M.Anis — Mon, 21 Sep 2015 13:03:54 GMT

yes exactly with the button it works fine. I can also update the firmware from the service in the hrs example. but I can't get it back to the bootloader advertising as "DfuTarg" from the service.

I wasn't able to find the nrfjprog.exe to upload the bootloader so I used a script that is supposed to replace it. I'll attach everything with the question

RE: when I start a DFU procedure the device is advertising empty packets

Hung Bui — Mon, 21 Sep 2015 12:55:23 GMT

You mean if you hold a button and reset the chip you can enter bootloader and can do DFU, but when you do button-less, you only have the device advertise with no data at all ?

This is pretty strange. Could you zip your bootloader project and the application project and add them into your question ? A sniffer trace could be very useful.

RE: when I start a DFU procedure the device is advertising empty packets

M.Anis — Mon, 21 Sep 2015 12:46:48 GMT

Hi Hung Bui, yes I'm testing with the ble_app_hrs in the SDK v8.1.0. no I didn't do any modification yes I have the bootloader flashed already. in fact the bootloader is working if I use it directly from the service in the hrs example.

but what I want to do is to reset the device in bootloader mode without using the button on the board as described in this link Testing the example without bonding I did all the steps as described but in step 10 10.Verify that the device is now advertising as "DfuTarg". I get the empty packet

RE: when I start a DFU procedure the device is advertising empty packets

Hung Bui — Mon, 21 Sep 2015 12:11:16 GMT

Hi M.Anis,

I assume you were testing with the ble_app_hrs in the SDK v8.1.0. Did you do any modification ?

Please be noted that you would need to flash the bootloader (\examples\dfu\bootloader) before you update your application (via the bootloader). Documentation here. Please let me know what you get when testing with the bootloader.