Added configuration option in MicroBitConfig to allow the default power level to be defined. Based on experiments undertaken by the BBC and subsequent policies defined by the BBC's child protection panel, to is set by default it's lowest level (0), in order to protect children's privacy. It should be noted that this is 30dB below the device's default setting, so will inevitably leave the device more susceptible to interference, and therefore significantly reduce the reliability of the device. This will likely present itself through increased packet loss, reduced thorughout, lost data and connection drop outs. The normal BLE power level on commercial devices translates to power level of 6. The author has witnessed an inability to connect to a micro:bit from a distance of 40cm under domestic conditions using a Samsung S5 mini running Android 4.4.2.master
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