Re: [Bacnet-developers] DNET and gateway

[Derek N. <de...@pu...>]

Thanks Dave,

 

I know very little about BBMD workings so any info is most welcome.  J

 

Client on site manually adds my root device 2700000 to his BBMD.

Discover works 20% of the time.

Client says problem is 2700000 is on DNET 0 while all other are on DNET 2809

 

Regards,

 

Derek Noffke

PurpleSwift

Cell: 082 780 4680

Tel: 021 761 8264

 

 

 

From: Dave Lindauer via BACnet-developers
[mailto:bac...@li...] 
Sent: Thursday, 13 May 2021 16:15
To: Discussion for developers of the BACnet stack
Cc: Dave Lindauer
Subject: Re: [Bacnet-developers] DNET and gateway

 

Generally the BBMD you want to talk to is on some other subnet.   To be
compatible with a BBMD you have to register with it at intervals (the
registration expires) so that you can get broadcasts from the other subnet.
Also in addition to broadcasting on your own network, you have to send your
broadcasts directly to the BBMD in point to point fashion so that they can
be received on the other network.   For example the IAM messages.

 

There is specific protocol related to this, but the bacnet stack has helpers
and so forth.    There might be an example as well.    I found it pretty
easy not only to interact with BBMDs but to create one for testing!

 

David

From: Derek Noffke <de...@pu...> 
Sent: Thursday, May 13, 2021 8:59 AM
To: bac...@li...
Subject: [Bacnet-developers] DNET and gateway

 

Greetings,

 

I have an app based on the gateway demo code.  BACnet Stack Version 0.8.4

I have been informed that my gateway is not compatible with a BBMD.

 

The startup I-AM sequence is attached.

I see that the I-AM for my "root" device 2700000 does NOT contain the DNET.

Is this possibly the problem?

 

Regards,

 

Derek Noffke

PurpleSwift

Cell: 082 780 4680

Tel: 021 761 8264