iMAC connects automatically after disconnecting a BLE device

[Yury Morgunov]

A bit more detailed:
A bug has been detected on the device under development. It is connected with the fact that if you try to disconnect a connected device on an iMAC Catalina, then it automatically reconnects.
On Android, this works well.
 
To exclude my mistakes I used an example from nordic HID_KEYBOARD. But it has the same problem.
In the example, I disabled

init.config.ble_adv_directed_high_duty_enabled = false;
init.config.ble_adv_directed_enabled = false;

Included logs received the following:

00> <info> ble_bas: Battery notification has been sent using conn_handle: 0x0000
00> <info> app: Disconnected
00> <info> app: m_whitelist_peer_cnt 2, MAX_PEERS_WLIST 8
00> <debug> app: pm_whitelist_get returns 1 addr in whitelist and 1 irk whitelist
00> <info> app: Fast advertising with whitelist.
00> <debug> peer_manager_handler: Event PM_EVT_BONDED_PEER_CONNECTED
00> <debug> peer_manager_handler: Previously bonded peer connected: role: Peripheral, conn_handle: 0, peer_id: 0
00> <debug> peer_manager_handler: Event PM_EVT_CONN_SEC_PARAMS_REQ
00> <debug> peer_manager_handler: Security parameter request
00> <debug> peer_manager_handler: Event PM_EVT_PEER_DATA_UPDATE_SUCCEEDED
00> <debug> peer_manager_handler: Peer data updated in flash: peer_id: 0, data_id: Peer rank, action: Update
00> <debug> peer_manager_handler: Event PM_EVT_LOCAL_DB_CACHE_APPLIED
00> <debug> peer_manager_handler: Previously stored local DB applied: conn_handle: 0, peer_id: 0
00> <info> app: Connected
00> <debug> peer_manager_handler: Event PM_EVT_CONN_SEC_START

But the problem remained the same. In addition, I tried to reset the pointer to p_peer_addr and disable whitelist, it did not help.
I don’t understand something or is it an iMAC problem?
Thanks!

[Susheel Nuguru]

Hi,

setting the advertising directed state to disable will not delete the bond information for the system.

If you do not want the device to be reconnected, then either delete the bond data or change the device address so that the peer sees your device as a different one than the one bonded

[Yury Morgunov]

I do not need to remove the connection between devices.
I need that after clicking disconnect it does not connect automatically until I click connect.
Communication between devices should remain

[Susheel Nuguru]

It is the peer device, that decides to connect/or not to connect to the advertisement from an already bonded device. I do not think the library from our SDK initiates the connection. Can you sniff the air packets to see who initiates the connection?

[Yury Morgunov]

I wrote packets through nrf sniffer in wireshark.:  0027.reconnect problem.pcapng
Performed the following actions:
Connected to the device via iMAC.
Clicked disconnect - the device was disconnected then connected.
Clicked disconnect again - same thing

To exclude no understanding attached photo buttons

In this case, the purchased ble keyboard turns off normally

[Yury Morgunov]

What if the problem is in the connection settings?

Maybe the device is too tempting to connect?

#define FIRST_CONN_PARAMS_UPDATE_DELAY   APP_TIMER_TICKS(5000)  
#define NEXT_CONN_PARAMS_UPDATE_DELAY    APP_TIMER_TICKS(30000) 
#define MAX_CONN_PARAMS_UPDATE_COUNT     3                     

static void conn_params_error_handler(uint32_t nrf_error)
{
    APP_ERROR_HANDLER(nrf_error);
}

static void conn_params_init(void)
{
    ret_code_t             err_code;
    ble_conn_params_init_t cp_init;

    memset(&cp_init, 0, sizeof(cp_init));

    cp_init.p_conn_params                  = NULL;
    cp_init.first_conn_params_update_delay = FIRST_CONN_PARAMS_UPDATE_DELAY;
    cp_init.next_conn_params_update_delay  = NEXT_CONN_PARAMS_UPDATE_DELAY;
    cp_init.max_conn_params_update_count   = MAX_CONN_PARAMS_UPDATE_COUNT;
    cp_init.start_on_notify_cccd_handle    = BLE_GATT_HANDLE_INVALID;
    cp_init.disconnect_on_fail             = false;
    cp_init.evt_handler                    = NULL;
    cp_init.error_handler                  = conn_params_error_handler;
    
    err_code = ble_conn_params_init(&cp_init);
    APP_ERROR_CHECK(err_code);
}