Zephyr bt_adv Too big advertising data

RE: Zephyr bt_adv Too big advertising data

snowuyl — Tue, 18 Jul 2023 07:44:13 GMT

Thanks for your reply! I will remove SMP service from advertising packets.

RE: Zephyr bt_adv Too big advertising data

Hung Bui — Tue, 18 Jul 2023 07:38:49 GMT

Hi,

Not really. It's used so that the app on the phone can be easier to detect if there OTA is supported on the device or not. But it's not mandatory. You can make the app that simply connect to your device, do the service discovery and can detect that if OTA is supported or not.

You can see that nRF Connect app can do that.

RE: Zephyr bt_adv Too big advertising data

snowuyl — Tue, 18 Jul 2023 01:38:52 GMT

Thanks for your reply! Is SMP service advertising mandatory for Over-the-air (OTA) update? I would like to remove SMP service from advertising packet if it isn't mandatory for OTA update.

RE: Zephyr bt_adv Too big advertising data

Hung Bui — Mon, 17 Jul 2023 14:13:34 GMT

Hi,
The error means what it means "Too big advertising data"

You don't have enough space in the scan response data (sd) for two 128 bit UUID and one 16 bit UUID. The maximum length of an advertising packet or a scan response packet is 31 bytes. This is included all the flags and headers.

My suggestion is to go through out Bluetooth Nordic Academy : https://academy.nordicsemi.com/courses/bluetooth-low-energy-fundamentals/

Advertising is covered in Chapter 2.

RE: Zephyr bt_adv Too big advertising data

snowuyl — Mon, 17 Jul 2023 09:14:02 GMT

devzone.nordicsemi.com/.../1447.bt_5F00_ad.c