Opimization server cache flow

[Elly2018]

Goal

Current server program does not have any cache system. so it needs to wait it to actually get the feedback from go pro cameras, But it use curlm so it needs to wait all the response, and when someone is offline it cause timeout issue, This makes response time longer, around 0.8 second waste.

And master fetch cycle needs to be optimized as well.

• Cache system
• ICMP client in server-side
• Master update cycle optimizaed
  • Master using reference instead of copy, Use copy to make thread more efficient

[Elly2018]

At the apply all update, it needs to handle this issue first to be enable to become usable at least...