Failed NsdManager Registration

Question

Problem: Short Description: I'm attempting to register a service & port visible to my PC for later connection to a PC application. This code does not register the service and I am unable to tell why, all I know is that when it runs on my phone through the android monitor I used a logger to tell me that the registration failed.

Longer Description: I've been trying to build a simple app that will provide my PC with information from my Android Phone. I'm unfamiliar with network programming but from my research I've understood that if I use android's NsdManager I will be able to create a service running on my network for the PC application I am developing to connect to using "Socket Programming". I've been attempting to use NsdManager to register this service (if theirs a better way to start a service running on my network on my phone to be connected to by PC the info would be much appreciated.

Requested Help: It would be nice to know: 1. What is the best way to begin developing an Android App that would "pair" with a PC app which I will develop later? 2. Will the NsdManager method of registering the service work for this? 3. Is there a way to catch the error code of why this service is unable to register? 4. Any helpful resources, libraries, tips or tricks for beginning android network development? I am new to this subsection of development and looking for these kinds of things.

Code:

import android.app.Activity;
    import android.content.Context;
    import android.net.nsd.NsdManager;
    import android.net.nsd.NsdServiceInfo;
    //import android.support.v7.appcompat.R;
    import android.os.Bundle;
    import android.util.Log;

public class ServerActivity extends Activity {     //Possibly should be extends "AppCompatActivity"
private String SERVICE_NAME = "meService";
private String SERVICE_TYPE = "_http._tcp.";
private String TAG = "ServerActivity";
private NsdManager mNsdManager;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_server);

    mMethod();

}

private void mMethod() {
    mNsdManager = (NsdManager) getSystemService(Context.NSD_SERVICE);
    registerService(9000);
}

@Override
protected void onPause() {
    if (mNsdManager != null) {
        mNsdManager.unregisterService(mRegistrationListener);
    }
    super.onPause();
}

@Override
protected void onResume() {
    super.onResume();
    if (mNsdManager != null) {
        registerService(9000);
    }

}

@Override
protected void onDestroy() {
    if (mNsdManager != null) {
        mNsdManager.unregisterService(mRegistrationListener);
    }
    super.onDestroy();
}

public void registerService(int port) {
    NsdServiceInfo serviceInfo = new NsdServiceInfo();
    serviceInfo.setServiceName(SERVICE_NAME);
    serviceInfo.setServiceType(SERVICE_TYPE);
    serviceInfo.setPort(port);

    mNsdManager.registerService(serviceInfo,
            NsdManager.PROTOCOL_DNS_SD,
            mRegistrationListener);
}

NsdManager.RegistrationListener mRegistrationListener = new NsdManager.RegistrationListener() {

    @Override
    public void onServiceRegistered(NsdServiceInfo NsdServiceInfo) {
        String mServiceName = NsdServiceInfo.getServiceName();
        SERVICE_NAME = mServiceName;
        Log.d(TAG, "Registered name : " + mServiceName);
    }

    @Override
    public void onRegistrationFailed(NsdServiceInfo serviceInfo,
                                     int errorCode) {
        Log.d(TAG, "Registration failed: " + errorCode);
        // Registration failed! Put debugging code here to determine
        // why.
    }

    @Override
    public void onServiceUnregistered(NsdServiceInfo serviceInfo) {
        // Service has been unregistered. This only happens when you
        // call
        // NsdManager.unregisterService() and pass in this listener.
        Log.d(TAG,
                "Service Unregistered : " + serviceInfo.getServiceName());
    }

    @Override
    public void onUnregistrationFailed(NsdServiceInfo serviceInfo,
                                       int errorCode) {
        // Unregistration failed. Put debugging code here to determine
        // why.
    }


   };

}

Thanks so much for your time and help!