Question about sequence numbers about min HOT 5 OPEN

The problem is that sequence numbers are not monotonic: they wrap around, and so comparisons can't be simple > or <.

If you don't really need the transport features and your application can just transmit its state periodically then you could just use the basic MIN layer, which would cut the overheads down a lot.

from min.

@mikemoretti3 did you ever come up with a solution to this? I'm also playing around with MIN and RS485, trying to work out how to deal with the half-duplex flow control aspect

from min.

no, i gave up on this protocol and developed my own. but this problem only occurred when talking to multiple boards from one main board. from your comment it doesn't sound like that's what you're doing?

from min.

I designed MIN for MCU-host communications rather than a multidrop bus because there wasn't anything simple to do the job. But if you want a multidrop bus protocol there are other options. Have you come across LIN?

from min.

no, i gave up on this protocol and developed my own. but this problem only occurred when talking to multiple boards from one main board. from your comment it doesn't sound like that's what you're doing?

Yeah I might end up doing my own protocol, I was actually just trying to not re-invent the wheel haha. I actually have a couple of devices on a single bus (that control servo motors) and a main controller. Really the system can be one direction half duplex controller -> slave, which will help with arbitration. I'll likely do something simple like $$"node id"*"len"#"payload ascii only"@"CRC"/n
The system is critical, so I need all the error checking capability, very low bandwidth however so even MIN is a bit over the top.

I designed MIN for MCU-host communications rather than a multidrop bus because there wasn't anything simple to do the job. But if you want a multidrop bus protocol there are other options. Have you come across LIN?

You are correct, MIN is awesome and I've actually used it for another project before in the past with great success, but not ideal for this application actually. LIN is actually a brilliant idea, never used it before but could fit the bill well. Also likely to be some good libraries out there to same me some time.

from min.