How do I add authorization on read/write on a service's characteristics?

[Rifat Mahmud]

I have done this:

ble_gatts_attr_md_t ble_attr_md;
memset(&ble_attr_md, 0, sizeof(ble_attr_md));
.
.
.
ble_attr_md.rd_auth = 1;
ble_attr_md.wr_auth = 1;
.
.
.
ble_gatts_attr_t ble_attr;
.
memset(&ble_attr, 0, sizeof(ble_attr));
.
.
ble_attr.p_attr_md = &ble_attr_md;
.
.
uint32_t error_code = sd_ble_gatts_characteristic_add(
        g_mesh_service.service_handle,
        &ble_char_md,
        &ble_attr,
        &ble_value_char_handles);

So, I do have a working service. But as I have set authorization for read and write, I cannot update it from nRF Master Control Panel App. How do I actually handle the authorization? Where to set the password?

[Petter Myhre]

Please examine this MSC.

You need to handle the BLE_GATTS_EVT_RW_AUTHORIZE_REQUEST event, and respond with sd_ble_gatts_rw_authorize_reply(SUCCESS) or sd_ble_gatts_rw_authorize_reply(WRITE_NOT_PERMITTED)

[Rifat Mahmud]

Thanks. But is there a way to set a password there, which will be coming from the GATT client that want to read from/write to the specific characteristics?

[Petter Myhre]

That is not possible with authorization. It is possible to authenticate using a passkey, but not authorize. Maybe you could build this into the application? You could use one characteristic for the passkey, then the peripheral can check it, and only send notifications to the central when it is correct?