parse request errors

[aldas]

parsing request returns errors as modbus error types

[codecov-commenter]

Codecov Report

Merging #7 (7eb934e) into main (cb7b0c3) will decrease coverage by 0.01%.
The diff coverage is 98.50%.

@@            Coverage Diff             @@
##             main       #7      +/-   ##
==========================================
- Coverage   98.61%   98.59%   -0.02%     
==========================================
  Files          27       27              
  Lines        2096     2282     +186     
==========================================
+ Hits         2067     2250     +183     
- Misses         19       22       +3     
  Partials       10       10              

Flag	Coverage Δ
unittests	98.59% <98.50%> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
packet/error.go	95.06% <86.66%> (-4.94%)	⬇️
packet/packet.go	100.00% <100.00%> (ø)
packet/readcoilsrequest.go	100.00% <100.00%> (ø)
packet/readdiscreteinputsrequest.go	100.00% <100.00%> (ø)
packet/readholdingregistersrequest.go	100.00% <100.00%> (ø)
packet/readinputregistersrequest.go	100.00% <100.00%> (ø)
packet/readwritemultipleregistersrequest.go	100.00% <100.00%> (ø)
packet/writemultiplecoilsrequest.go	100.00% <100.00%> (ø)
packet/writemultipleregistersrequest.go	100.00% <100.00%> (ø)
packet/writesinglecoilrequest.go	100.00% <100.00%> (ø)
... and 2 more

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