Added validation of message size

[alex268]

Fixes #542

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.65%. Comparing base (df87343) to head (0a2e5c6).

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #546      +/-   ##
============================================
+ Coverage     62.41%   62.65%   +0.23%     
- Complexity     2378     2385       +7     
============================================
  Files           331      331              
  Lines         13773    13778       +5     
  Branches       1380     1380              
============================================
+ Hits           8596     8632      +36     
+ Misses         4538     4506      -32     
- Partials        639      640       +1     

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