Connecting and disconnecting to various peripherals

[Daniela_A]

Hello everyone,

Right now I am working on a demo showing some functionalities of 2 smartwatches: Colmi P8B and PineTime. I am using nRF52840 for that purpose.

I had the idea the following idea:

• When BSP_EVENT_KEY_1 is pressed, a name filter is set for one of the smartwatches (Colmi) and a new scan with that parameter is launched. This part is working fine and a connection with the smartwatch I'm looking for is happening.
• When BSP_EVENT_KEY_3 is pressed, the previously started connection is broken as I trigger a disconnection event. This part is also working fine.
• When BSP_EVENT_KEY_2 is pressed, another name filter is set, now for the other smartwatch (PiniTime) and a new scan with that parameter is launched.

Here is the problem: Sometimes I am able to connect to the smartwatch (PineTime) I'm requesting when pressing BSP_EVENT_KEY_2 ; however, most of the times the connection is re-established with the other smartwatch.

Following is the code of the implementation of the part of the buttons.

void bsp_event_handler(bsp_event_t event)
{
    ret_code_t err_code;
    char m_target_periph_name_1[] = "InfiniTime";
    char m_target_periph_name_2[] = "P8b";

    switch (event)
    {
        case BSP_EVENT_SLEEP:
            nrf_pwr_mgmt_shutdown(NRF_PWR_MGMT_SHUTDOWN_GOTO_SYSOFF);
            break;

        case BSP_EVENT_DISCONNECT:
            err_code = sd_ble_gap_disconnect(m_conn_handle, BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
            if (err_code != NRF_ERROR_INVALID_STATE)
            {
                APP_ERROR_CHECK(err_code);
            }
            break;

        case BSP_EVENT_WHITELIST_OFF:
            whitelist_disable();
            break;

        case BSP_EVENT_KEY_1:

            err_code = nrf_ble_scan_filter_set(&m_scan,
                                           SCAN_NAME_FILTER,
                                           m_target_periph_name_2);
            NRF_LOG_INFO("Scanning for COLMI PB8 Smartwatch");
            scan_start();
            APP_ERROR_CHECK(err_code);
            break;

        case BSP_EVENT_KEY_2:
            err_code = nrf_ble_scan_filter_set(&m_scan,
                                           SCAN_NAME_FILTER,
                                           m_target_periph_name_1);
            NRF_LOG_INFO("Scanning for Pinetime Smartwatch");
            scan_start();
            APP_ERROR_CHECK(err_code);
            break;
        
        case BSP_EVENT_KEY_3:
            err_code =sd_ble_gap_disconnect(m_conn_handle, BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
            if (err_code != NRF_ERROR_INVALID_STATE)
            {
                APP_ERROR_CHECK(err_code);
            } 	
            NRF_LOG_INFO("Disconnected from smartwatch. ");
            break;


        default:
            break;
    }
}

Any suggestions are welcome

Thanks in advance!

PS: I can´t just turn off one of the smartwatches so it stops advertising. 

[Daniela_A]

I actually found a solution for it. In the case of BSP_EVENT_KEY_3 (when a smartwatch disconnects), I added a function to remove all the filters for the scan (nrf_ble_scan_all_filter_remove).

Later, the name filter is set again when either the key 1 or 2 is pressed.

With that strategy, the code is running smoothly and in the way I want.