where could I store per connection variables? about modbus HOT 5 CLOSED

I'm not sure what you mean you're out of options... you have infinite options. I purposely do not implement any kind of process/register map abstraction because everyone's use case is different.

Put them in a Map<Integer, Integer> or get as complicated as you'd like?

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well, this is a first thing that comes to mind, but if only I could use AttributeMap interface of Channel so I could actually store my context in a connection, that would be much better, isn't it?

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Modbus register and status values are not traditionally per-connection - it's supposed to be a global address space.

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If ServiceRequest gave you access to the Netty Channel would that work for you?

edit: Mmm, might not be that easy, this interface has to work for RTU support as well, where there won't be a Channel.

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That would be perfect, thank you. In fact this is how I changed your code in order to continue with my project, but I felt a little off about it.

edit: well, it can return null for RTU for all I care, I use only TCP right now, so... at least it's better than nothing

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