SDK 3.0.2 NUS .sent callback missing

RE: SDK 3.0.2 NUS .sent callback missing

MartynasK — Wed, 16 Jul 2025 16:47:15 GMT

Hello, Susheel Nuguru,

Thank you for information.

I have used bt_gatt_indicate and now project works like before, I'm getting indicate callback after LE LL ACK from central and I can stream my BIN data.

For some reason it looks like BT_GATT_CCC_NOTIFY in SDK 1.9.1 works in same way like BT_GATT_CCC_INDICATE in SDK 3.0.2.

We can close the ticket.

Best regards,

MartynasK.

RE: SDK 3.0.2 NUS .sent callback missing

Susheel Nuguru — Tue, 15 Jul 2025 14:42:47 GMT

Hi Martynas,

.sent function was just a NUS wrapper and not a BLE feature but just a feature in that library. You actually do not need this wrapper function in NUS as you already have bt_gatt_notify_cb the can call your registered callback function once the notification has been sent. Remember that this callback function is processed from system workqueue so it is only realtime if there are no higher priority threads running. If you really want end to end delivery, then you need to switch to GATT Indications. You can then use bt_gatt_indicate and its bt_gatt_indicate_func_t to use it like a Ack like feature.