bleak reads can hang if a device walks out of range, cope with that.

[geeksville]

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 61.92%. Comparing base (9e71e85) to head (111d61e).

Files	Patch %	Lines
meshtastic/ble_interface.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #624   +/-   ##
=======================================
  Coverage   61.92%   61.92%           
=======================================
  Files          14       14           
  Lines        3015     3015           
=======================================
  Hits         1867     1867           
  Misses       1148     1148           

Flag	Coverage Δ
unittests	61.92% <0.00%> (ø)

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