List of Bluetooth devices in range from the json content in the item. e.g. as produced by the Xiaomi MI IO binding for bluetooth enabled devices Example item content: {"C812105B04000400":"-91","blt.3.17q3si5345k00":"-45","blt.4.10heul64og400":"-63"}
{"C812105B04000400":"-91","blt.3.17q3si5345k00":"-45","blt.4.10heul64og400":"-63"}