Bonding issue in SDK11 with ANCS

RE: Bonding issue in SDK11 with ANCS

Hung Bui — Fri, 24 Mar 2017 12:04:36 GMT

The tutorial is in the youtube introduction in the page I pointed to.

I don't really get what you meant in your comment. You said if(((table_index.mr_cnt_val-table_index.lr_cnt_val)== DEVICE_MANAGER_MAX_BONDS-1) is executed, meaning dm_device_delete(&device); is called, and it should free up one space in the database, and you should be able to bond with the next device.

Could you check why it couldn't ?

RE: Bonding issue in SDK11 with ANCS

chapman — Fri, 24 Mar 2017 02:24:56 GMT

Actually, is is mentioned in github.com/.../nRF51-ble-peripheral-bond-handling that "The example always keeps one block free for a new device to be added, so make sure to adjust DEVICE_MANAGER_MAX_BONDS to desired number of bonds + 1." and //Delete first created bond if bond table is full if(((table_index.mr_cnt_val-table_index.lr_cnt_val)== DEVICE_MANAGER_MAX_BONDS-1) However , it is checked in "if (p_evt->event_id == DM_EVT_DEVICE_CONTEXT_STORED)" and delete first created bond if bond table is full
if(((table_index.mr_cnt_val-table_index.lr_cnt_val)== DEVICE_MANAGER_MAX_BONDS-1) ..... This code is seen to be executed when it reach DEVICE_MANAGER_MAX_BONDS-1.

I have a nrf51 dongle but I don't know how to use sniffer to check the bonding between my device with iphone. Is there any tutorial about that?

RE: Bonding issue in SDK11 with ANCS

Hung Bui — Thu, 23 Mar 2017 14:08:53 GMT

Hi Chapman,

Sorry I didn't notice the behavior of the example on github is to erase bond when it reach DEVICE_MANAGER_MAX_BONDS-1.

Could you check what happens when you get DM_EVT_DEVICE_CONTEXT_STORED event, and reach DEVICE_MANAGER_MAX_BONDS-1 of bond (in this case 3) ? Do you see the code execute what it supposed to do of erasing the oldest bond ?

If you have a sniffer , you can check if you can bond with the last central (the new phone) and if ANCS is transferred.

RE: Bonding issue in SDK11 with ANCS

chapman — Thu, 23 Mar 2017 01:10:23 GMT

There is always ANCS on the first iPhone but no ANCS on another iPhone after reaching maximum bond. The SDK11's original ANCS example has the same phenomenon. If using SDK10's ANCS original example, when it reach the maximum 4 bond, it will never receive any ANCS again until erase and flash the program on the chip. As I add app_bond.c like nRF51-ble-peripheral-bond-handling example, it will never trigger DM_DEVICE_CONTEXT_FULL. Because the code will delete the last bond when DEVICE_MANAGER_MAX_BONDS-1 . It works in SDK10 but fail in SDK11.

RE: Bonding issue in SDK11 with ANCS

Hung Bui — Wed, 22 Mar 2017 10:04:08 GMT

Hi,

Could you explain this "Then I bond this to another iPhone, There is no ANCS response anymore. " ?

There is no ANCS on the another iPhone or no ANCS on the first iPhone ?

If you reach the maximum 4 bond, and you bond with another phone, the program will trigger DM_DEVICE_CONTEXT_FULL event and erase all bond. This explain why you can't connect to the first iPhone.