Get the RSSI device (if connected), above or below the golden range. If the RSSI is within the golden range, a value of 0 is returned. For the actual RSSI value, use getRawRSSI. For more information, see the Bluetooth 4.0 Core Specification.
- macOS 10.7+
Returns the RSSI of the device. If the value cannot be read (e.g. the device is disconnected), a value of +127 will be returned.