Updated README.md with a little more information

seansund · May 9, 2017 · e711d5f · e711d5f
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 # peoplecount-server
 
 Server-side flow for peoplecount application. Communicates with devices via MQTT. The camera device code is available in [peoplecount-camera](https://github.com/seansund/peoplecount-camera).
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+The server exposes an HTTP request input to initiate the flow. Once started, a new capture instance is added to the database and a message with the new capture_id is published to a command topic so that devices will initiate the capture.
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+When the device has completed its capture it will publish to an event topic to which the server has subscribed. When a message comes in, the server looks up the capture in the database using the capture_id and updates the total count and counts list with the information from the device.