Android Question Serversocket.GetMyIp returns wrong IP

janderkan

Active Member
Licensed User
I use an Android box with an ethernet interface.
The box is connected to network using ethernet.
The serversocket.GetMyIp returns correct IP, both with wifi enabled and disabled.

When I enable tethering(Hotspot) then serversocket.GetMyIp returns the tethering IP (192.168.43.1)

Anyone have an idea how I can get correct ethernet IP with tethering enabled?
 

Erel

Administrator
Staff member
Licensed User
Note that it returns a correct ip address. Just not the one you are interested in.

Try this code:
B4X:
Sub Activity_Create(FirstTime As Boolean)
  Dim jo As JavaObject
  jo.InitializeContext
  jo.RunMethod("PrintAllInterfaces", Null)
End Sub


#if JAVA
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Enumeration;

public static void PrintAllInterfaces() throws Exception {
  for (Enumeration<NetworkInterface> e = NetworkInterface.getNetworkInterfaces(); e.hasMoreElements();) {
     BA.Log("" + e.nextElement());
  }
  }
 
#End If
Do you see the correct ip address in the logs?
 

janderkan

Active Member
Licensed User
Here er the log with Hotspot disabled:
[ip6tnl0][5]
[tunl0][3]
[sit0][4]
[eth0][2][/fd79:a696:734b:0:2c0a:72ff:fed0:6bab%2%2][/fe80::2c0a:72ff:fed0:6bab%eth0%2][/192.168.1.160]
[lo][1][/::1%1%1][/127.0.0.1]

Serversocket returns 192.168.1.160


and with Hotspot enabled:
[ip6tnl0][5]
[wlan0][31][/fe80::1a:11ff:feff:fa65%wlan0%31][/192.168.43.1]
[tunl0][3]
[sit0][4]
[eth0][2][/fd79:a696:734b:0:2c0a:72ff:fed0:6bab%2%2][/fe80::2c0a:72ff:fed0:6bab%eth0%2][/192.168.1.160]
[lo][1][/::1%1%1][/127.0.0.1]

Serversocket returns 192.168.43.1
 

Erel

Administrator
Staff member
Licensed User
You can use this code to get the ip address of a specific interface:
B4X:
Sub Activity_Create(FirstTime As Boolean)
   Dim jo As JavaObject
   jo.InitializeContext
   Log(jo.RunMethod("getIp", Array("wlan0"))) 'change to eth0 to get the ethernet address
End Sub


#if JAVA
import java.net.InetAddress;
import java.net.Inet6Address;
import java.net.NetworkInterface;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Enumeration;

public static String getIp(String interfaceName) throws Exception {
  for (Enumeration<NetworkInterface> e = NetworkInterface.getNetworkInterfaces(); e.hasMoreElements();) {
     NetworkInterface ni = e.nextElement();
     if (ni.getName().equals(interfaceName)) {
       Enumeration<InetAddress> en2 = ni.getInetAddresses();
       while (en2.hasMoreElements()) {
         InetAddress ia = en2.nextElement();
         if (!ia.isLoopbackAddress()) {
           if ((ia instanceof Inet6Address) == false) {
             return ia.getHostAddress();
           }
         }
       }
     }
  }
    return "";
  }
 
#End If
 
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