I use the Plugable USB dongle on my Windows 7 Pro machine to talk to the Puck with good results. On my RPi2 hub I used this one from ameriDroid (via Amazon) with good results prior to my switching to the RPi3. The RPi3 works well also.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
I use the Plugable USB dongle on my Windows 7 Pro machine to talk to the Puck with good results. On my RPi2 hub I used this one from ameriDroid (via Amazon) with good results prior to my switching to the RPi3. The RPi3 works well also.
https://www.amazon.com/gp/product/B01LEX8Z6W/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
I got that one since I really wanted to use my Odroid XU4 as my Espruino Hub. And that is the official BT/BLE dongle for it.