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A pure no-std Rust modbus library

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I'm using `modbus-core` to parse requests/responses in order to display in a more user friendly way in this [tool](https://github.com/pythcoiner/modbus485_debugger), i just notice i got this parsing issue: ![image](https://github.com/slowtec/modbus-core/assets/124568858/b6ee2adf-160c-4610-ae07-0255c2b605a2) ![image](https://github.com/slowtec/modbus-core/assets/124568858/e8c8c100-8ec1-46a5-b4ee-7a68d878a46d) i...

Is there a reason the codec module isn't being exported? Right now, the encoding trait isn't available.

enhancement
help wanted

This check were not done at some places, this PR add it where it is missing.

I believe there is an issue in src/codec/rtu/mod.rs in fn request_pdu_len. You may want to check the Modbus application protocol spec, sections 6.11 and 6.12, to make sure. IMHO, the...

PR to fix the request PDU length calculation mentioned in https://github.com/slowtec/modbus-core/issues/12. My application doesn't use coils but I've attempted to implement the fix for FC 0x0F as well. I have...