what is the conn_handle? And when does it use?

[JoonDong]

I don't know where it is used..

example, when I use sd_ble_gatts_hvx(conn_handle, &p_hvx_params), conn_handle was BLE_GATT_HANDLE_INVALID(0x0000) result of debugging.

Why is conn_handle exist? although charateristic handle actually used is included in p_hvx_params.

[Hung Bui]

Yes, it's assigned by softdevice each connection. If you are using nRF5 as a peripheral , you simply only have conn_handle = 0x0000 as there is only one connection at a time.

[JoonDong]

Thank you for your answer. That is very helpful.