title: Determining signal strength in nRF24L01
body: <p>I learned that Tmrh20's <a href="https://github.com/nRF24/RF24/blob/master/RF24.h" rel="nofollow noreferrer">library</a> for nRF24L01 provides us to print out "strong signal" if some threshold passed and "weak signal" if not.</p>
  
  <pre><code>bool goodSignal = radio.testRPD();
  if(radio.available()){
  Serial.println(goodSignal ? "Strong signal &gt; 64dBm : "Weak signal &lt; 64dBm");
  radio.read(0,0);
  </code></pre>
  
  <p>That means we are actually able to determine the signal strength, for example -40dBm in order to do this comparison. So I need this value.
  Any way to get this value? </p>