Use embedded-time and keep track on inflight outgoing messages

[keisrk]

Currently the content of outgoing_pub buffer is not utilized. By attaching a timestamp to each inflight message, we can judge when to re-try publishing it again, or discard as no puback received.

[codecov-io]

Codecov Report

Merging #21 (bd366a3) into master (b51eee9) will decrease coverage by 0.38%. The diff coverage is 15.71%.

@@            Coverage Diff             @@
##           master      #21      +/-   ##
==========================================
- Coverage   45.57%   45.19%   -0.39%     
==========================================
  Files           5        5              
  Lines         531      551      +20     
  Branches      151      142       -9     
==========================================
+ Hits          242      249       +7     
- Misses        211      229      +18     
+ Partials       78       73       -5     

Impacted Files	Coverage Δ
src/eventloop.rs	23.11% <7.14%> (-0.36%)	:arrow_down:
src/lib.rs	30.55% <14.28%> (+0.55%)	:arrow_up:
src/state.rs	39.69% <22.85%> (+0.34%)	:arrow_up:

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[MathiasKoch]

Is this PR ready?

[keisrk]

Yes it is:)

[MathiasKoch]

It seems to be getting Disconnecting from handshake timeout! constantly.. I will fix this part, while you continue on the QoS1 PR

[keisrk]

Thanks a lot:)