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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.
@Gordon
It looks like that one is specifically for Audio (so not Bluetooth LE). However I imagine a lot of what gives that the good range is just having a decent aerial on it.
It is possible to get Bluetooth USB dongles with decent aerials, however they seem particularly hard to come by. I just did a quick search and found:
https://www.alibaba.com/product-detail/Long-range-bluetooth-csr4-0-dongle_60822149411.html
And I've ordered one to have a play with - if it works I may start stocking them as they seem particularly rare.
Your other option is to go the EspruinoHub route and use Raspberry Pis to bridge the Bluetooth to WiFi/Ethernet. Currently it doesn't handle multiple Pis but that is on my To-do list :)