[TW#25833] unable to set password in gatt_security_server example

[sw-dev-code]

Hi everyone,

I want to implement BLE security using password authentication. My device don't have Display or Keyboard and I want to connect to it using Android. My idea is to enter six digit key on Android side which I manually set in ESP firmware.

For start I'm using gatt_security_server example from ESP-IDF and I can't find the way to manually set BLE password, every time ESP generates random six digit password.

Is there a way to set manual password and to disable random password generation in gatt_security_server example?

Thank you all for advises in advance.

[Weijian-Espressif]

@MIlan991 I have added an API to set static passkey, it will be merged into IDF next week.

[sw-dev-code]

@Weijian-Espressif Great, thank you.

[sw-dev-code]

Solved in 892fc4a.

[chegewara]

@Weijian-Espressif thanks for that feature

[chegewara]

@Weijian-Espressif
I have to add, probably its how it suppose to be, but this only works with 6 digit passkey.

[Weijian-Espressif]

The spec define:
Numeric value (passkey) entered by user. Valid values are decimal 000000 - 999999.

for example:
uint16_t passkey = 123;
esp_ble_gap_set_security_param(ESP_BLE_SM_SET_STATIC_PASSKEY, &passkey, sizeof(uint16_t));

for some phones , it is ok that you enter 123, but some other phones maybe need you enter 000123.

[chegewara]

@Weijian-Espressif I did test and for me works only 0 or 000000 and all 6 digit values. Ive been trying 1234 and 12345 but could not pair/bond with nRF connect android smartphone.

I did not try 001234 on smartphone because with dynamic passkey when i have had 5 digit passkey it was enough to validate without leading 0. I will try with leading 0's and leave feedback.

PS i am using uint32_t instead, but it should not be an issue.

[chegewara]

@Weijian-Espressif
I can confirm, leading 0s help and it works. Thanks.

[marcolettieri]

I 'm using the example server gatt security...with iphone and android with NRF app it connects without prompt passkey... already checked if i've the last commits

[chegewara]

Im guessing you have this setting not changed:
https://github.com/espressif/esp-idf/blob/master/examples/bluetooth/gatt_security_server/main/example_ble_sec_gatts_demo.c#L557

It needs to be changed to ESP_IO_CAP_DISPLAY if i remember.

[marcolettieri]

do you mean ESP_IO_CAP_OUT? Il 07/11/18 16:03, chegewara ha scritto:

…

Im guessing you have this setting not changed: https://github.com/espressif/esp-idf/blob/master/examples/bluetooth/gatt_security_server/main/example_ble_sec_gatts_demo.c#L557 It needs to be changed to |ESP_IO_CAP_DISPLAY| if i remember. — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#2322 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AHSe23ugfqFULQh_m9SKIIBIcretFMttks5usvZUgaJpZM4WInQI>.

[chegewara]

Yes, thats the one.

[marcolettieri]

but why static passkey changes?
i receive the passkey Notify number overwrite my passkey

[chegewara]

This value needs to be set to use static passkey:
https://github.com/espressif/esp-idf/blob/master/examples/bluetooth/gatt_security_server/main/example_ble_sec_gatts_demo.c#L562

[chegewara]

I dont know, i just copy pasted this part of code to my (Kolban's) library and it works like expected.