ble_bas_battery_level_update() failed errCode=0x3401 when nRF Connect enable LE secure connection pairing

 0> <info> app: Version 1.0.0
 0>
 0> <info> app: ========| flash info |========
 0> <info> app: erase unit:   4096 bytes
 0> <info> app: program unit: 4 bytes
 0> <info> app: end address: 0x7FFFF
 0> <info> app: ==============================
 0> <info> app_timer: RTC: initialized.
 0> <debug> app: NOR_DATA_PERIOD=819
 0>
 0> <debug> app: NOR_RECORD_PERIOD=8192
 0>
 0> <info> app: bsp_button_longkey_handler 0.
 0> <warning> app: Battery volage 93mV is too low
 0>
 0> <warning> app: Battery volage 8mV is too low
 0>
 0> <info> app: Reg 0 20
 0> <info> app: bsp_button_longkey_handler 1.
 0> <debug> nrf_ble_gatt: Requesting to update ATT MTU to 185 bytes on connection 0x0.
 0> <info> app: Connected.
 0> <debug> app: state=1
 0>
 0> <debug> nrf_ble_gatt: ATT MTU updated to 185 bytes on connection 0x0 (response).
 0> <info> ble_bas: Battery level has been updated: 6%
 0> <debug> ble_bas: Error: 0x00003401 while sending notification with conn_handle: 0x0000
 0> <warning> app: ble_bas_battery_level_update() failed errCode=0x3401
 0>
 0> <info> ble_bas: Battery level has been updated: 0%
 0> <debug> ble_bas: Error: 0x00003401 while sending notification with conn_handle: 0x0000
 0> <warning> app: ble_bas_battery_level_update() failed errCode=0x3401
 0>
 0> <debug> app: mv=435, percent=0
 0>
 0> <info> ble_bas: Battery level has been updated: 82%
 0> <debug> ble_bas: Error: 0x00003401 while sending notification with conn_handle: 0x0000
 0> <warning> app: ble_bas_battery_level_update() failed errCode=0x3401
 0>
 0> <info> ble_bas: Battery level has been updated: 0%
 0> <debug> ble_bas: Error: 0x00003401 while sending notification with conn_handle: 0x0000
 0> <warning> app: ble_bas_battery_level_update() failed errCode=0x3401

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