Question regarding MS/TP on a different subnet - how to find the IP address of the BBMD?

[leanfm]

I'm working with a BACnet setup where my BAC0 client and the target BACnet infrastructure are on separate subnets:

Current Setup:

• BAC0 software running on my local subnet
• Trane Tracer SC BACnet server on a different subnet (IP address known)
• Multiple MS/TP devices connected through the Tracer SC
• Subnets are separated, requiring BBMD for broadcast traffic

Problem Summary:
My discovery methods aren't working across subnets:

• bacnet.discover() returns no devices, whois() (with and without global-broadcast=True) finds no networks
• Direct device reads using IP addresses work fine: bacnet.read('192.168.x.x object property')
• Network-based reads fail: bacnet.read('network:MAC object property')
• Network-based reads fail: bacnet.read('network:MAC@Tracer SC IP object property')

Root Cause:
I believe the issue is that I haven't configured BAC0 with the correct BBMD address during initialization. While I can communicate directly with the Tracer SC via IP, I can't discover the broader network topology or communicate with MS/TP devices because broadcast traffic isn't being properly routed.

Question:
How can I identify the BBMD device's IP address in this network? Or any other ways to address this?

Any guidance on BBMD discovery techniques or BAC0 configuration strategies would be greatly appreciated.

[ChristianTremblay]

Good question, I usually know those details up front, on the network I'm connected to.

Do you have access to control drawings ? Network details ?