Fix discovery of SED's

[brefra]

Fix the discovery of battery powered "Sleeping End Devices".
It was broken after applying #30

[codecov]

Codecov Report

Merging #36 into main will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #36   +/-   ##
=======================================
  Coverage   94.75%   94.75%           
=======================================
  Files           4        4           
  Lines        1488     1488           
=======================================
  Hits         1410     1410           
  Misses         78       78           

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