Android Code Snippet UDP Broadcast Address

Erel

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This code uses JavaObject to go over the device network interfaces and find the first UDP broadcast address.
This address can be used to send a UDP packet to all devices listening to a specific port.

B4X:
'Returns the UDP broadcast address.
'Returns an empty string if not available.
Sub GetBroadcastAddress As String
   Dim niIterator As JavaObject
   niIterator = niIterator.InitializeStatic("java.net.NetworkInterface").RunMethod("getNetworkInterfaces", Null)
   Do While niIterator.RunMethod("hasMoreElements", Null)
     Dim ni As JavaObject = niIterator.RunMethod("nextElement", Null)
     If ni.RunMethod("isLoopback", Null) = False Then
       Dim addresses As List = ni.RunMethod("getInterfaceAddresses", Null)
       For Each ia As JavaObject In addresses
         Dim broadcast As Object = ia.RunMethod("getBroadcast", Null)
         If broadcast <> Null Then
           Dim b As String = broadcast
           Return b.SubString(1)
         End If
       Next
     End If
   Loop
   Return ""
End Sub
 
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