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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.
@Robin
Tue 2020.04.14
Regarding external USB BLE adapters, not all mfg that produce 4v0 BT dongles are BLE compliant. It's likely they are trying to dump existing 4V0 stock in favor of 5V0 BT. Check their specs first.
I use an external USB Insignia 4V1 dongle which stated BLE and works ~ ten ft/three m using an HP Notebook - Windows10 laptop.
Although not directly related, see spec detail for BLE date releases, in a compendium of links: