Ember+ Multi-Package Framing

[tuxfan]

Hey There. I'm using libember for a consumer I'm writing and I'm having a bit of trouble decoding multi-package responses from my device.

I presumed that I would just strip out the package bodies and append them into a single OctetStream (StreamBuffer) which I could then call 'DomReader().decodeTree( stream, GlowNodeFactory::getFactory() )' on, but this is throwing an 'Implicit tag or universal outer tag found' exception. Decoding single responses doesn't work either. 

Am I missing something? I can't find any information about how they actually get split.

Cheers

[Stefan Weber]

Are you aware that the byte stream is s101-encoded?

[tuxfan]

You mean a whole package structure of:

0xFE BOF

0x00 Device Slot 

0x0E Message type: EmBER 

0x00 Command type: EmBER Packet 

0x01 Version 

0xC0 Flags: Single Packet message (First packet | Last packet) 

0x01 DTD Type: Glow DTD 

0x02 Application Bytes 

0x05 Minor Glow DTD Version 

0x02 Major Glow DTD Version 

<payload>

CRC

CRC

0xFF EOF

With escaped characters in the payload?

I'm stripping off everything (after checking) and leaving the payloads intact.

[Stefan Weber]

So the answer to my question is: yes you are...What I do is first decode the entire received buffer(s) with libs101::StreamDecoder and interpret the payload with libember::dom::AsyncDomReader::read(). Since you cannot know if this was the last message of a s101-sequence, you should evaluate the result tree when AsyncDomReader::isRootReady() returns true.

[tuxfan]

Brilliant. Was worried I was missing something with the S101 decoding. I'll stick that in. Cheers mate.