ble Master-slave integrated machine(nordic 52840) ,at the same time ,Nordic 52840 device use static passkey (with android mobile connect )and need to connect another device(Nordic 52832) use static passkey;

[syc776]

when receive the BLE_GAP_EVT_SEC_PARAMS_REQUEST event，to call  sd_ble_gap_sec_params_reply return  NRF_ERROR_INVALID_STATE(code 8);

[Vidar Berg]

Have you included the Peer manager module in your project? In that case, you should let the peer manager handle the event.

[syc776]

thanks for you answer!

yes , include the peer manager module in my project .

please. tell me how to do it?

[Vidar Berg]

Sure you don't have it already? I assumed that was the reason you got the error in the first place. Please check if peer_manager.c is included in your project. If it is you need to remove the BLE_GAP_EVT_SEC_PARAMS_REQUEST handling in your code. 

[syc776]

yes. include peer_manager.c  ,if I remove the BLE_GAP_EVT_PARAMS_REQUEST handing ,I can not use static passkey to connect other device!

[Vidar Berg]

You need to initialize the Peer manager to support pairing with passkey. See my answer here: https://devzone.nordicsemi.com/f/nordic-q-a/48417/ble-peripheral-nordic52832-use-static-passkey-at-same-time-i-have-one-nordic52840-central-how-to-use-static-passkey