Close broken connections

[andig]

Close broken connections so they will be reopened on next operation.

Depends on #68. Refs evcc-io/evcc#17446 (comment).

Note: I've removed the receive error annotation since send doesn't add one either.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.

Project coverage is 47.68%. Comparing base (6020765) to head (bf957e7).

Files with missing lines	Patch %	Lines
rscp/client.go	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #71      +/-   ##
==========================================
- Coverage   47.83%   47.68%   -0.15%     
==========================================
  Files          28       28              
  Lines        1315     1319       +4     
==========================================
  Hits          629      629              
- Misses        652      656       +4     
  Partials       34       34              

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[spali]

@andig Thanks for the contribution