How to send file

Openfire Openfire Support
,
1

I use this code to send file,and receiver is Spark.I got timeout error.

fun sendFile(connection: XMPPTCPConnection, receiver: String) {
    val file = File("D:\\DOSBox-X\\dosbox-x.conf")
    if (file.exists()) {
        val transferManager = FileTransferManager.getInstanceFor(connection)
        println(transferManager)
        val receiverUid = JidCreate.entityFullFrom(
            JidCreate.entityBareFrom(receiver),
            Resourcepart.from("android")
        )
        val out = transferManager.createOutgoingFileTransfer(receiverUid)
        out.sendFile(file, "file.name")
    } else {
        println("file not exist")
    }
}

Error log:

sendFile: [Negotiating Transfer]:0.0
sendFile: [Negotiating Transfer]:0.0
sendFile: [Negotiating Stream]:0.0
sendFile: [Negotiating Stream]:0.0
org.jivesoftware.smack.SmackException$NoResponseException: No response received within reply timeout. Timeout was 10000ms (~10s). StanzaCollector has been cancelled. Waited for response using: IQReplyFilter: iqAndIdFilter (AndFilter: (OrFilter: (IQTypeFilter: type=error, IQTypeFilter: type=result), StanzaIdFilter: id=217RA-52)), : fromFilter (OrFilter: (FromMatchesFilter (full): 1@im.imorning.cc/android)).
                                                                                  	at org.jivesoftware.smack.StanzaCollector.nextResultOrThrow(StanzaCollector.java:281)
                                                                                  	at org.jivesoftware.smackx.bytestreams.socks5.Socks5BytestreamManager.establishSession(Socks5BytestreamManager.java:502)
                                                                                  	at org.jivesoftware.smackx.filetransfer.Socks5TransferNegotiator.createOutgoingStream(Socks5TransferNegotiator.java:57)
                                                                                  	at org.jivesoftware.smackx.filetransfer.OutgoingFileTransfer.negotiateStream(OutgoingFileTransfer.java:380)
                                                                                  	at org.jivesoftware.smackx.filetransfer.OutgoingFileTransfer.access$100(OutgoingFileTransfer.java:44)
                                                                                  	at org.jivesoftware.smackx.filetransfer.OutgoingFileTransfer$2.run(OutgoingFileTransfer.java:232)
                                                                                  	at java.lang.Thread.run(Thread.java:923)