Allow LESC "Just Works" Pairing/Bonding with NRF Connect SDK (Zephyr) after pressing Button

Question

Hi 
 Is there an example for BLE "Just Works" using the NRF Connect SDK for the peripheral device? 
 I am using a peripheral device without display and would like to allow pairing / bonding for a short period of time after pressing a button. 
 Having registered callbacks using bt_conn_auth_cb and setting .passkey_display = NULL and .passkey_confirm = NULL does result in being able to pair and bond, yet I would like to only allow bonding in case a button has been pressed before. 
 Registering pairing_confirm and calling bt_conn_auth_cancel (in case pairing is not allowd) has not yielded the desired outcome so far and I am wondering if this is at all possible (the above pattern used to work with the nRF5 SDK). 
 Any advise would be appreciated! 
 Best Manuel

Simon · Accepted Answer

Try setting .pairing_confirm = NULL as well. 
 I got LESC Just Works to work by modifying the peripheral_uart sample in NCS in the following manner: 
 diff --git a/samples/bluetooth/peripheral_uart/prj.conf b/samples/bluetooth/peripheral_uart/prj.conf
index cd6df0664..57b883765 100644
--- a/samples/bluetooth/peripheral_uart/prj.conf
+++ b/samples/bluetooth/peripheral_uart/prj.conf
@@ -48,3 +48,6 @@ CONFIG_LOG_BACKEND_RTT=y
 CONFIG_LOG_BACKEND_UART=n
 
 CONFIG_ASSERT=y
+CONFIG_BT_SMP_SC_PAIR_ONLY=y
+CONFIG_BT_MAX_PAIRED=3
\ No newline at end of file
diff --git a/samples/bluetooth/peripheral_uart/src/main.c b/samples/bluetooth/peripheral_uart/src/main.c
index cf51a899f..224fee01c 100644
--- a/samples/bluetooth/peripheral_uart/src/main.c
+++ b/samples/bluetooth/peripheral_uart/src/main.c
@@ -364,10 +364,10 @@ static void pairing_failed(struct bt_conn *conn, enum bt_security_err reason)
 
 
 static struct bt_conn_auth_cb conn_auth_callbacks = {
- .passkey_display = auth_passkey_display,
- .passkey_confirm = auth_passkey_confirm,
+ .passkey_display = NULL,//auth_passkey_display,
+ .passkey_confirm = NULL, //auth_passkey_confirm,
 .cancel = auth_cancel,
- .pairing_confirm = pairing_confirm,
+ .pairing_confirm = NULL,//pairing_confirm,
 .pairing_complete = pairing_complete,
 .pairing_failed = pairing_failed
 }; 
 Best regards, 
 Simon

Allow LESC "Just Works" Pairing/Bonding with NRF Connect SDK (Zephyr) after pressing Button

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