code: def rssi(self, timeout_sec=TIMEOUT_SEC):
          
          # Kick off query to get RSSI, then wait for it to return asyncronously
          # when the _rssi_changed() function is called.
          self._rssi_read.clear()
          self._peripheral.readRSSI()
          if not self._rssi_read.wait(timeout_sec):
              raise RuntimeError('Exceeded timeout waiting for RSSI value!')
          return self._rssi
docs: Return the RSSI signal strength in decibels.