I regularly open and close Wifi, send a &#x27;spurt&#x27; of data, and shut down the Wifi.  This is on a system with a 400mAH battery, it stays on for days and days without much fuss .. certainly BLTE and co. (where is ANT+ these days?) are lower-energy, but even if its only &#x27;just close&#x27; in terms of energy efficiency, all the advantages of using Wifi instead of Bluetooth are huge.