| [cf-dev] transfer of large files |
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Hello to everyone, Could someone please give me a hint on how to solve this problem?
I am using the HelloWorldServer (from the cf-helloworld-server project within the Californium Java Eclipse project) to send a response to a client via „exchange.respond(theResponse);“ or exchange.respond(ResponseCode.CONTENT
, theResponse);” Server and client run on the same machine (simply run from within eclipse). The payload of “theResponse” varies: 1)
A string „Hello world“ à works well, client receives the string without any problems 2)
A 10MB byte array from a file
à works well, client receives the 10MB file without any problems 3)
A 130MB byte array from a file
à an error occurs, I get the following output: server: Dez 08, 2014 1:44:50 PM org.eclipse.californium.core.network.Matcher receiveRequest INFORMATION: Message is a duplicate: CON-GET MID=30101, Token=de29246d, OptionSet={"Uri-Path":"fileResource3", "Block2":1048581}, "" client: Dez 08, 2014 1:44:50 PM org.eclipse.californium.core.network.Matcher receiveResponse WARNUNG: Token matches but not MID: Expected 30101 but was 30100 No response received. I think there seems to be something wrong with the message handling? A duplicate message that probably should be ignored causes an error here?
(Of course, one could surely handle file transfer in many other/better ways than using CoAP. This is not my point here.) Greetings,
Helge
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