protected ReadRssiRequest readRssi() {
		return Request.newReadRssiRequest().setRequestHandler(requestHandler);
	}
Reads the current RSSI (Received Signal Strength Indication).
<p>
The returned request must be either enqueued using {@link Request#enqueue()} for
asynchronous use, or awaited using await() in synchronous execution.

@return The request.
ble/src/main/java/no/nordicsemi/android/ble/BleManager.java