Akka IO refusing to send an empty datagram

[hd471...@gmail.com]

Dear group,

I am trying to send an empty datagram back to a client. This seems not to be supported. The same code works just fine is the datagram payload is non-empty:

// MyProxy is a 'bound UDP' server

MyProxy extends Actor {

   ....

  def receive = {

    case res: ProxyResponse =>

      val rdata = encodeToBlob(res)

      socket ! Send(rdata, remote)             <-- works if rdata.size()>0, does not work for ByteString.empty and ByteString("")

  }

}

Would you agree that this is a bug? 

cheers,

felix

[Endre Varga]

Hi Felix,

I just opened a ticket: https://github.com/akka/akka/issues/17325

We need to check if it is possible to reliably distinguish zero length UDP datagrams with NIO though

-Endre

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[hd471...@gmail.com]

Thanks!! The blocking io api definitely allows this (I checked it before posting my original post), it results in a datagram consisting only of the 8 UDP header bytes. For nio it seems impossible to tell if passing the datagram to the system buffer actually worked...