Start UDP-Server

P

Pfanne

New Member
Licensed User
Longtime User
Hi,

i try to start a UDP-Server in listening-mode,
but the port is not open.

B4X: 
Sub Process_Globals
  Dim UDPSocket2 As ServerSocket
End Sub

Sub Activity_Create(FirstTime As Boolean)
  Activity.LoadLayout("main")
  If FirstTime Then
    UDPSocket2.Initialize(33333, "UDP")
  End If
End Sub

Sub Activity_Resume
  UDPSocket2.Listen
End Sub

Sub UDP_PacketArrived (Packet As UDPPacket)
  If Packet.Port = 33333 Then Log("33333")
End Sub

What did i wrong?

Thanks for yor help.
Greetings from germany
Pf@nne
 
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P

Pfanne

New Member
Licensed User
Longtime User
Hi Erel,

thanks for your answer.

Packet.Port returns the port in the device that sent the packet
Click to expand...

OK, but in Wireshark i see that port 33333 ist not reachable.
If i send UDP to port 33333 nothing happends.

This schould be show all recheived Data on ervery Port, isent it?
B4X: 
Sub UDP_PacketArrived (Packet As UDPPacket)
    Dim msg As String
    msg = BytesToString(Packet.Data, Packet.Offset, Packet.Length, "UTF8")
    Msgbox("Message received: " & msg, "")
End Sub

Is my code in post #1, to open a UDP-Server in listenig mode on port 33333 OK?

Thanks for your Help
Pf@nne
 
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P

Pfanne

New Member
Licensed User
Longtime User
Hello Erel,

i also use the UDP-Socket to send UDP-Data and receive the response from the far server.

I think the used UDP-Socket is, after sending, only a limeted time in listenig (Server) Mode on the random Port

How to set the UDP-Socket permanent in listening Mode on Port xxxxx?


Greets
Pf@nne
 
Last edited:
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P

Pfanne

New Member
Licensed User
Longtime User
Hi Erel,

of course you were absolutely right!

But my port 33333 is only in my home-LAN reachable.
With dissabled WLAN the port is over the WAN,
by using the current mobile IP, not reachable.

As I said, after sending a UDP i received Data on the random send-port over the WAN.

It seams that there is any thing like a firewall....

Do you have a idea what i do wrong.......

Thanks for your quick support
greets from germany
Pf@nne
 
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