Kaiheila Adapter: stable ping interval for websocket mode.

[TsFreddie]

Websocket connection should be less likely to drop now.

• Swaped out setTimeout with setInterval and clear the interval with lazyness.
• Heartbeat timeout intervals are now 6s, 2s & 4s instead of ms.
• Added default endpoint config.

[shigma]

Thanks a lot

[codecov]

Codecov Report

Merging #187 (c95a45c) into develop (a78f407) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #187   +/-   ##
========================================
  Coverage    91.12%   91.12%           
========================================
  Files           56       56           
  Lines        10697    10697           
  Branches      2133     2133           
========================================
  Hits          9748     9748           
  Misses         949      949           

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