PASSKEY

[katyon]

 I’ve downloaded     nRF5_SDK_11.0.0_89a8197 and starting with examples from \examples\ble_peripheral\???\pca10040\s132\arm5_no_packs\

 I would like the other device to request a passkey (constant) at pairing (the passkey on my side is constant - no display needed)

After   gap_params_init();I’ve added the following code:

 

{

 static ble_opt_t optS;

   static uint8_t passw[]="123456";           

 optS.gap_opt.passkey.p_passkey=passw;

   err_code =sd_ble_opt_set(BLE_GAP_OPT_PASSKEY, &optS);

}

 

err_code returned :  0  

 

Still the module will pair and communicate without requesting a passkey.

I've tried to find an answer in Q&A . in some answers there was a reference to fields : io_caps,mitm. cant make out what does it mean. 

(these fields belong to structs relevant to services, not pairing)

 

Thanks for any help

   Yona

[Vidar Berg]

Hi Yona,

You can change the permission/security level on the BLE characteristics to require MITM pairing. The central does not need to pair with the device if security level is set to "open".

E..g, change BLE_GAP_CONN_SEC_MODE_SET_OPEN(&attr_md.read_perm) to BLE_GAP_CONN_SEC_MODE_SET_ENC_WITH_MITM (&attr_md.read_perm) if you want to limit read access to a certain characteristic. 

 

[katyon]

thank you for the answer.

making this change - finally  "produces"  the  events:

BLE_GAP_EVT_SEC_PARAMS_REQUEST,   BLE_GAP_EVT_AUTH_STATUS

how should I deal with them ?

(as the cellphone application does not know that passkey is needed- so reading the characteristic results in a  BLE disconnection)

Yona

[bjorn-spockeli]

But have you set the  IO params in the central to  BLE_GAP_IO_CAPS_KEYBOARD_ONLY or BLE_GAP_IO_CAPS_KEYBOARD_DISPLAY ? It is the central that will send the AUTH_KEY_REQUEST to the peripheral. 

[katyon]

please note  the lines:

#define SEC_PARAM_IO_CAPABILITIES BLE_GAP_IO_CAPS_KEYBOARD_DISPLAY

the function dealing with these defines is   device_manager_init()

after it filles the params- it calls dm_register()

I've wrote these lines in my question

Yona

[bjorn-spockeli]

Yes, i am aware of that but you stated that you're using the ble_app_hrs example which is a peripheral example. Hence, I am asking if you have configured the CENTRAL example to have one of the two mentioned IO capabilities? 

[katyon]

Sorry.

It seems I dont understand how exactly to configure the central-other then what I already did.

could you please show me how to do this configuration

thanks 

Yona

[bjorn-spockeli]

Your original post was this:

me again, new issue 

now that a peripheral BLE is working (including the passkey), I'm requested to develop a tester for that unit.

For that I need A BLE central .

so I started with nRF5_SDK_11.0.0_89a8197\examples\ble_central\ble_app_multilink_central .

all is fine.the only issue is again: how to operate the passkey (as a central unit)

thanks

Yona

So first question are you still using the ble_app_multilink_central as the central example for your tester? If yes, have you set the IO capabilities in this example as BLE_GAP_IO_CAPS_KEYBOARD_ONLY or BLE_GAP_IO_CAPS_KEYBOARD_DISPLAY? 

[katyon]

as I realized that I would need to use BLE_GAP_IO_CAPS_KEYBOARD_ONLY /BLE_GAP_IO_CAPS_KEYBOARD_DISPLAY    for the passkey issue,

It seemed much closer (from answers on these pages)- to use ble_app_hrs, so I switched to that project.

I can Read/Write to (my)peripheral BLE that dosnt include a passkey.

Yona

[bjorn-spockeli]

But you do understand that the ble_app_hrs is a peripheral example and that it cannot communicate with your custom peripheral unless you add the central role to this example? You need to modify the ble_app_hrs_c example( found in nRF5_SDK_11.0.0_89a8197\examples\ble_central\ble_app_hrs_c) if you want to communicate with your custom peripheral 

[katyon]

Sorry Sorry Sorry

of course I mean ble_app_hrs_c.

I understood where to find my advertised peripheral services and how to read/write to the characteristics.

 

[katyon]

just to clarify: all work (read+write) from central -only if peripheral is configured without a passkey .

if peripheral contains passkey then read returns a zero length. 

in that case:  BLE_GAP_EVT_AUTH_KEY_REQUEST event never happens.

Yona

[bjorn-spockeli]

Is possible for you to upload the ble_app_hrs_c as well as the ble_app_hrs example folders that you have modified?