bonding and mitm

[samo]

Hi everyone

I was testing the bonding with MITM settings. I used the code from the following link: github.com/.../nRF51-ble-peripheral-bond-handling. I tested the bonding on the nrf51822 chip with SDK 10 via a mobile application nrf Connect. I came across the following strange observations:

• When I would like to establish only the bond with the phone and nrf51 chip everything works fine, a phone asks for a static password and the bonding is successfully done. After that in the Scanner tab of the phone application, the nrf chip is not visible anymore. If I would like to be nrf visible I have to reset the chip.
• If I bond and delete bond a few times via a nrf connect and then reset the nrf chip, it is not visible anymore. I have to upload a new program on nrf chip.

I am using the nrf chip with 16kB RAM and 128kB ROM. If I execute the same program on PCA10028 board I do not get the second problem mentioned earlier, but the first problem still occurs. Due to this fact, I checked the sizes of RAM and ROM and I find the following values:

      Code (inc. data)   RO Data    RW Data    ZI Data      Debug   

     29096       2066        444        284       5308     522541   Grand Totals
     29096       2066        444        284       5308     522541   ELF Image Totals
     29096       2066        444        284          0          0   ROM Totals

==============================================================================

    Total RO  Size (Code + RO Data)                29540 (  28.85kB)
    Total RW  Size (RW Data + ZI Data)              5592 (   5.46kB)
    Total ROM Size (Code + RO Data + RW Data)      29824 (  29.13kB)

==============================================================================

Thus the size of RAM is approximately 5.46kB and ROM equal to 29.13kB + 96kB (softdevice) < 128kB. In this calculation of ROM, the application vector table is not included because I did not find any information about its size, please see Figure 12 at infocenter.nordicsemi.com/.../S110_SDS_v2.0.pdf. I am wondering if the sizes of ROM and RAM from Keil are really correct or it can be changed during the code execution. I really do not know where is the problem in my code and I will be grateful for any advice regarding my problem.

Best regards

Samo

[run_ar]

When the device is not visible anymore, have you checked if you are getting a reset or assert? And could you try to advertise without a whitelist(BSP_EVENT_WHITELIST_OFF)?

[Siddharth rana]

Hello run_ar

I have been facing same bonding issue.

With bonding set to zero and mitm set to 1 my device is visible and I m able to input my static passkey.

But with bonding and mitm together I run into sysysy reset.

Please can u help me out with some solutions.

[run_ar]

Hi, please create a new case. Make sure you post which SDK version and SoftDevice version you are using. As well as debug logs and the error code you get that is causing the system to reset (compile with DEBUG flag, and check the app_error_handler). A sniffer trace would also be useful if there is nothing obvious in the error handler.