Galaxy S5 can't scan Bluetooth devices

RE: Galaxy S5 can't scan Bluetooth devices

kxct — Tue, 30 Apr 2019 07:44:02 GMT

S5 can normally parse the UUID of the broadcast packet.Thanks for your support

RE: Galaxy S5 can't scan Bluetooth devices

Sigurd — Tue, 30 Apr 2019 07:37:30 GMT

Interesting to see that putting the name into the scan response packet fixed the issue. It should not be any risk to do this, but it depends on what criteria the central connects on, since you now moved the UUID to the normal advertising packet. Is the UUID in the advertising packet parsed correctly by the S5 phone?

RE: Galaxy S5 can't scan Bluetooth devices

kxct — Tue, 30 Apr 2019 01:15:52 GMT

Sigurd,

Modify the code of the initialization part of the Advertising data, the problem is solved.
What is the risk of doing this?

I only know some basic Bluetooth specifications, not very clear about the specific details.

//    init.advdata.name_type          = BLE_ADVDATA_FULL_NAME;
//    init.advdata.include_appearance = false;
//    init.advdata.flags              = BLE_GAP_ADV_FLAGS_LE_ONLY_LIMITED_DISC_MODE;

//    init.srdata.uuids_complete.uuid_cnt = sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]);
//    init.srdata.uuids_complete.p_uuids  = m_adv_uuids;

    init.srdata.name_type          = BLE_ADVDATA_FULL_NAME;
    init.advdata.include_appearance = false;
    init.advdata.flags              = BLE_GAP_ADV_FLAGS_LE_ONLY_LIMITED_DISC_MODE;

    init.advdata.uuids_complete.uuid_cnt = sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]);
    init.advdata.uuids_complete.p_uuids  = m_adv_uuids;

RE: Galaxy S5 can't scan Bluetooth devices

kxct — Tue, 30 Apr 2019 00:09:52 GMT

I will update the firmware of my mobile device before I try.

thank you for your reply

RE: Galaxy S5 can't scan Bluetooth devices

Sigurd — Mon, 29 Apr 2019 15:23:56 GMT

Hi,

The only thing that is different, is that we starting from SDK 14 are using channel select algorithm(CSA #2). This is a mandatory feature in Bluetooth version 5, and can not be disabled. In the Advertising channel PDU Header, shown in the picture below, this is one bit that is changed from 0 to 1. This was added starting from S132 v.5(SDK14). It seems that the phone does not handle this small change, and is therefore not able to parse the data correctly. This is then be a bug with phone, and unfortunately nothing we at Nordic can do anything about.

Advertising channel PDU Header in Bluetooth 5.0:

RE: Galaxy S5 can't scan Bluetooth devices

kxct — Mon, 29 Apr 2019 12:13:03 GMT

Modify the example ble_app_uart (SDK12.3) device name is "1234", S5 can scan to the device normally.
SDK14.2 and SDK15.2 are not normal

RE: Galaxy S5 can't scan Bluetooth devices

kxct — Mon, 29 Apr 2019 06:47:43 GMT

The Galaxy S10 can scan Bluetooth devices normally.