Re: New DLT_ type request

[Guy Harris via tcpdump-workers <tcpdump-workers () lists tcpdump org>]

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> From: Guy Harris <gharris () sonic net>
>
> Date: Wed, 5 Jan 2022 11:56:12 -0800
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> On Jan 5, 2022, at 9:38 AM, Timotej Ecimovic via tcpdump-workers <tcpdump-workers () lists tcpdump org> wrote:
>
> > I'm requesting an addition of the new DLT type. I'd call it: DLT_SILABS_DEBUG_CHANNEL.
> > The description of the protocol is here:
> > https://github.com/SiliconLabs/java_packet_trace_library/blob/master/doc/debug-channel.md
>
>         ...
>
> > In case of errors (such as the ] not being present after the length bytes) the recovery is typically accomplished by 
> > the deframing state engine reading forward until a next [ is found, and then attempting to resume the deframing. This 
> > case can be detected, because the payload of individual message contains the sequence number.
>
> So, presumably:
>
>         1) all packets in a LINKTYPE_SILABS_DEBUG_CHANNEL capture begin with a '[';
>
>         2) all bytes after the '[' and the payload bytes specified by the length should be ignored as being from a 
> framing error, unless there's just one byte equal to ']'?
>
> I.e., code reading the capture file does *not* have to do any deframing?
>
> What do the bits in the "Flags" field of the 3.0 debug message mean?  Does "few bytes of future-proofing flags" mean 
> that there are currently no flag bits defined, so that the field should always be zero, but there might be flag bits 
> defined in the future?
>
> > The types supported are listed in this file.
>
> The file in question:
>
>         
> https://github.com/SiliconLabs/java_packet_trace_library/blob/master/silabs-pti/src/main/java/com/silabs/pti/debugchannel/DebugMessageType.java
>
> lists a bunch of message types; is there a document that describes the format of messages with each of those types?
>
>
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