title: Discover all services in the network using android NSD
body: <p>I´m trying to find all services in the network using:</p>
  
  <pre><code>mNsdManager.discoverServices(
              SERVICE_TYPE, NsdManager.PROTOCOL_DNS_SD, mDiscoveryListener);
  </code></pre>
  
  <p>but you have to define SERVICE_TYPE for example:</p>
  
  <pre><code>public static final String SERVICE_TYPE = "_http._tcp.";
  </code></pre>
  
  <p>so it will discover all http services using tcp, but it wouldn´t find https services at the same time or any other kind of services</p>
  
  <p>how can i set all this in order to find any service using tcp?</p>
  
  <p>Thank you in advance.</p>