title: Adb over wireless without usb cable at all for not rooted phones
body: <p>I want to debug Android APPs on my phone (LG nexus 4). I'm travelling and I forgot my USB cable. When I work at home I can do it just connecting the USB cable and executing the command 'adb tcpip 5555'. Then I can unplug the USB cable and connect via 'adb connect IP'. </p>
  
  <p>But now I cannot execute the first command because I don't have a cable. I don't understand why I have to do it every time, since I already execute the 'adb tcpip' command before. </p>
  
  <p>What I tried now: </p>
  
  <p>I installed a terminal application on my Android and tried to execute that command there, but I received a "device not found" error. Maybe he cannot see himself... </p>
  
  <p>I search for any reasonable option in "Android Development Options" and enabled everything seemed to have relation with Wifi. But nothing helped.</p>
  
  <p>I search StackOverflow, but all answers I found involving connect via USB cable before. Is there I way to do this connection without the need of a cable at all? </p>
  
  <p>Some info: 
  My Nexus 4 isn't rooted. 
  The android version is 5.1.1. </p>