Which BLE version in DA14581?
I have DA14581 functional spec that indicates that this chip supports BLE v4.1. A newer version of the spec (and the webpage summary) for this part indicates BLE v4.2:
"The DA14581 supports a flexible memory architecture for storing Bluetooth profiles and custom application code, which can be updated over the air (OTA). ...The transceiver interfaces directly to the antenna and is fully compliant with the Bluetooth 4.2 standard."
