TCP messages can be received over localhost (in windows and editor) and to testing app on android device over local network, but not with a Unity built android app.

I am using Unity 5.6.0f3 on windows 10 to build a googleVR app for android, that waits for messages sent via TCP sockets (using the TCPListener class), from Max 7 with the mxj net.tcp.send object. This all works fine over localhost and I can receive messages sent from Unity to Max using the Max/Unity interoperability toolkit, but when I deploy the app to my phone the messages fail to send. A third-party testing app receives the messages on the phone fine and prints them to screen.

using UnityEngine; using System.Collections; using System; using System.Text; using System.Net; using System.Net.Sockets; using System.IO;

public class JitReceive : MonoBehaviour {

 public int portNo;
 public int maxObjects;
 public int pReps = 1;
 public int nPlanetOffset = 0;
 public GameObject Sphere1;
 public GameObject Scripts;
 public GameObject rollercoaster;
 //struct for pointing to various objects
 private struct objectList {
     public string objName;
     public GameObject objPointer;
     
     public void set(string s, GameObject gp) {
         objName = s;
         objPointer = gp;
     }
 }
 private int numObjects;
 private objectList[] o;
 
 //custom calls pointer
 JitCustomEvents jitCustom;
 
 private TcpClient incoming_client;
 private NetworkStream netStream;
 private TcpListener server;
 private bool waiting;
 public string wSphere;

 // Use this for initialization
 void Start () {
     
     if (portNo == 0) portNo = 32005;
     if (maxObjects == 0) maxObjects = 1024;
     waiting = false;
     server = new TcpListener(IPAddress.Parse("192.168.0.9"), portNo);
     server.Start();
     numObjects = 0;
     o = new objectList[maxObjects];
     jitCustom = (JitCustomEvents)GetComponent("JitCustomEvents");
 }
 
 // Update is called once per frame
 void Update () {
     
     string s;
     string[] values;
     
     if (server.Pending()) {
         incoming_client = server.AcceptTcpClient();
         netStream = incoming_client.GetStream();

         waiting = true;
     }
     while (waiting && netStream.DataAvailable) {
         try {
             int numread = 0;
             byte[] tmpbuf = new byte[1024];
             numread = netStream.Read(tmpbuf, 0, tmpbuf.Length);

             s = Encoding.ASCII.GetString(tmpbuf, 0, numread);
             s = s.Replace("\n","");
             values = s.Split(';');
         
             if (values.Length > 1) {
                 for (int i = 0; i < (values.Length-1); i++) {
                     Parse(values[i]);
                 }
             }
             else Parse(values[0]);
         }
         //Called when netStream fails to read from the stream.
         catch (IOException e) {
             waiting = false;
             netStream.Close();
             incoming_client.Close();
         }
         //Called when netStream has been closed already.
         catch (ObjectDisposedException e) {
             waiting = false;
             incoming_client.Close();
         }
     }    
 }
 
 void Parse(string toParse) {

     GameObject target = null;
     bool found = false;
     int pNum = 1;
     string[] values = toParse.Split (' ');

     Debug.Log (values [2]);
     wSphere = values [2];
     pNum = int.Parse (values [3]);


     if (values[1] == "1")
     {
         Scripts.GetComponent<loadLevel>().reLoad();
     }
     else if (values[0] == "2")
     {
         Scripts.GetComponent<InstantiateTrack>().numberOfNodes = int.Parse(values[1]);
         Scripts.GetComponent<InstantiateTrack>().minX = int.Parse(values[2]);
         Scripts.GetComponent<InstantiateTrack>().maxX = int.Parse(values[3]);
         Scripts.GetComponent<InstantiateTrack>().minY = int.Parse(values[4]);
         Scripts.GetComponent<InstantiateTrack>().maxY = int.Parse(values[5]);
         Scripts.GetComponent<InstantiateTrack>().PlaceNodes();
     }
     else if (values[1] == "3")
     {
         rollercoaster.GetComponent<RollerCoasterPlanes>().enabled = true;
     }
     //Instantiate (Sphere1);
     //nPlanetOffset = nPlanetOffset + 1;

This is the code I adapted from the Max/Unity interoperability toolkit.

Any help would be greatly appreciated :)