add back probing

[vchuravy]

No description provided.

[codecov-commenter]

Codecov Report

Merging #29 (a9ae5e9) into main (de1bed2) will decrease coverage by 0.44%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main      #29      +/-   ##
==========================================
- Coverage   72.09%   71.64%   -0.45%     
==========================================
  Files           4        4              
  Lines         971      977       +6     
==========================================
  Hits          700      700              
- Misses        271      277       +6     

Impacted Files	Coverage Δ
src/UCX.jl	84.98% <0.00%> (-0.78%)	⬇️

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