How do I add a 128-bit UUID to my advertising packet

RE: How do I add a 128-bit UUID to my advertising packet

Andrew Ong — Thu, 09 Aug 2018 23:26:19 GMT

Following this tutorial worked for me. I have to note that after I removed all the fatal errors, my device just plain did not advertise until I realized that my advertising payload was too long (32 bytes) and shortened it to 28 bytes.

RE: How do I add a 128-bit UUID to my advertising packet

Bjørn Kvaale — Tue, 07 Aug 2018 12:56:02 GMT

I would also take a look at this custom ble service tutorial. It explains things in a simple manner step by step. The source code is also available in sdk 14.

RE: How do I add a 128-bit UUID to my advertising packet

Mahesh Venkitachalam — Tue, 07 Aug 2018 04:28:14 GMT

sd_ble_uuid_vs_add adds your custom characteristic - it doesn't make it show up on your advertisement packets. You have to put that in yourself - maybe in the scan response. See for instance the ble_app_uart example in SDK 15.0.0.

The NUS UUID is defined in:

static ble_uuid_t m_adv_uuids[] = /**< Universally unique service identifier. */
{
{BLE_UUID_NUS_SERVICE, NUS_SERVICE_UUID_TYPE}
};

It's used here, in advertising_init:

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