nrf52832 disconnecting frequently getting error 0x3b in nrfConnect

[NIDHIN K]

I'm using the ble_app_hrs example code  and added a new custom services with multiple characteristics . conn.interval 10ms- 15ms and need to get maximum throughput so i set MTU size 160bytes packet and sending data in 1ms continuously but  after 2-3 minutes its disconnecting automatically getting error 0x3b in nrfconnect app and error Disconnected, reason 22 getting in nrf52832 log.

[Sigurd]

Hi,

You can find the explanation for the error-codes at this link.

E.g. 0x3B is "Connection Interval Unacceptable.".

Note that the ble_app_hrs example will disconnect if the phone does not accept a connection interval between the max and min limit set in the example, so you should try to adjust the values. The default values are:

#define MIN_CONN_INTERVAL                   MSEC_TO_UNITS(400, UNIT_1_25_MS)        /**< Minimum acceptable connection interval (0.4 seconds). */
#define MAX_CONN_INTERVAL                   MSEC_TO_UNITS(650, UNIT_1_25_MS)        /**< Maximum acceptable connection interval (0.65 second). */

The disconnect is done in the ble_app_hrs example in the on_conn_params_evt function, snippet:

static void on_conn_params_evt(ble_conn_params_evt_t * p_evt)
{
    ret_code_t err_code;

    if (p_evt->evt_type == BLE_CONN_PARAMS_EVT_FAILED)
    {
        err_code = sd_ble_gap_disconnect(m_conn_handle, BLE_HCI_CONN_INTERVAL_UNACCEPTABLE);
        APP_ERROR_CHECK(err_code);
    }
}