RE: Zephyr - BLE: How to send response after characteristic write operation?

Susheel Nuguru — Mon, 08 Nov 2021 16:16:56 GMT

There is no feature in BLE where a write is to peer characteristic will automatically trigger a response with value.

I think what you have is pretty good solution which many have used already.

[quote user=""]I wonder what is the difference between BT_GATT_CHRC_WRITE_WITHOUT_RESP and BT_GATT_CHRC_WRITE, is it somehow related to response on lower BLE layer and is not really related to the application?[/quote]

BT_GATT_CHRC_WRITE gives response from the GATT layer to the app the write has been successful. No value can be exchanged from peer to your device in this response.

BT_GATT_CHRC_WRITE_WITHOUT_RESP wont give any response even from the own GATT from the stack of your device.

Eventhough the message sequence charts are from different SDK the underlying logic is the same, just different API in zephyr