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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.
@Jean-Philippe_Rey
by the way, the idea behind using such an FEM module is to increase range to cover outdoor applications as well. More and more systems and sensors use BLE advertising to publish data and having the possibility to support the FEM would drastically help outdoor applications for environmental sensors or beacon tracking