RE: [Omnetpp-l] Creating a custom message definition

[Alfonso Ariza Quintana]

This problem usually appears when you try to extract or peek a header incorrectly.

For example, you have two headers

MyHeader1, MyHeader2

And in the top is the MyHeader1

if you do

pkt->peekAtFront<MyHeader2>()

you will have the error that you have commented.

It is possible to do a roundabout using Chunk class that is the ancestor of all headers.

auto chunk = pkt->peekAtFront<Chunk>();

if (dynamicPtrCast<const MyHeader2>(chunk )){

}

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De: omn...@googlegroups.com <omn...@googlegroups.com> en nombre de Asi Lev <asi...@gmail.com>
Enviado: sábado, 13 de febrero de 2021 21:38
Para: OMNeT++ Users <omn...@googlegroups.com>
Asunto: [Omnetpp-l] Creating a custom message definition

 

Hello everyone,

I'm trying to create a custom inet Packet message.

I've created a .msg file which extends FieldsChunk.

I use it in some event before a packet is sent, adding my custom chunk before the packet is sent down to IP.

When it runs, I get the following error:

Implicit chunk serialization is disabled to prevent unpredictable performance degradation (you may consider changing the Chunk::enableImplicitChunkSerialization flag or passing the PF_ALLOW_SERIALIZATION flag to peek)

I set the "enableImplicitChunkSerialization" flag, and then I get the next error:

Cannot serialize Ipv4 header without a properly computed CRC

So I add *.host*.ipv4.ip.crcMode = "computed" to omnet.ini, but the problem persists.

I think what I actually need to do is create a custom serializer/desrializer to my custom packet, but the only documentation I can find is this:

https://inet.omnetpp.org/docs/developers-guide/ch-packets.html

And there's not enough information on how to create these serializers/deserializers.

Any help will help.

Thanks,

Asi

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