TODO

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General
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- make framer read header->read header.length
- add all modbus control into server
- add correct transaction handling (retry, fail, etc)
- Test/update examples
- update code to satisfy mypy
- get coverage > 98%
- clean raise to be at frame level
- solve "TO FIX" in code

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Protocols
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- Serial RTU -> just use sleep wait
- Write unittest for serial with virtual tty
- Example with custom framer based on standard framer

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Utilities
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- (tcp/udp/serial) forwarder

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Client
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- Rework transaction flow and response data