Fixed Passkey Pairing on Peripheral without I/O

[Masa Kawa]

We are developing a Bluetooth peripheral device.

The peripheral has no input/output capability, and a fixed passkey is pre-programmed.

We would like the pairing to succeed only when the central device enters the correct passkey during pairing.

Are there any sample projects or examples that can help implement this functionality?

SDK:nRF5 SDK 15.3.0

SoftDevice:s132_nrf52_6.1.1

[Masa Kawa]

Thank you for your response. 

We will refer to the information you provided regarding the concept of passkey and serial number.

As for the fixed passkey, we were able to implement it as follows, so we will close this inquiry:

1.Set the passkey at startup using sd_ble_opt_set.

2.When the BLE_GAP_EVT_SEC_PARAMS_REQUEST event occurs, respond with the following parameters using sd_ble_gap_sec_params_reply:

ble_gap_sec_params_t sec_param;
sec_param.bond = 0;
sec_param.mitm = 1;
sec_param.lesc = 0;
sec_param.keypress = 0;
sec_param.io_caps = BLE_GAP_IO_CAPS_DISPLAY_ONLY;
sec_param.oob = 0;
sec_param.min_key_size = 7;
sec_param.max_key_size = 16;