title: BLE module alternative to XBee modules
body: <p><strong>Context:</strong></p>
  
  <p>I am to do a project which is to compare ZigBee to Bluetooth Low Energy (BLE).</p>
  
  <p>The parameters which the technologies are to be measured is RSSI over range and power consumption.
  Both technologies/modules must be connected to a battery of some sort. Will be decided later in the project.</p>
  
  <p>Both modules shall be controlled individually by a MCU/Arduino/Raspberry Pi which shall <em>not</em> be powered by the battery. So the only thing that should be powered by the battery is the ZigBee and BLE module.</p>
  
  <p>I am considering to use the XBee 3 module as the ZigBee module. I'm aware that it comes with a BLE possibility aswell, but i need to evaluate two different modules, which is why i can't just use it both for the ZigBee and BLE testing.</p>
  
  <p>This leads to the following questions:
  (Questions are based on the context above)</p>
  
  <p><strong>Questions:</strong></p>
  
  <ol>
  <li>Any suggestions for BLE modules which are enable to sleep for several minutes before being pulled active again?</li>
  <li>Any suggestions for ZigBee modules which operates in the 868MHz range, which is able to sleep for several minutes before being pulled active again?</li>
  <li>Is there a problem with having the microcontroller connected to a different power-source than the ZigBee/BLE module?</li>
  </ol>
  
  <p>Looking forward to your replies.</p>