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Simply speaking, the target will poll for updated versions, and the server will create a deployment package based on the contents of the file system.

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The (configurable) scheduler will, by default, check every two seconds for an update. It does so by connecting to the server it finds in conf/org.apache.ace.discovery.property.cfg, on the endpoint /deployment. It first checks whether there are new versions by looking up /deployment/<gatewayID> (you can try this all in a browser, by the way). If there is a newer version than the one already installed, it will request the newest version, stating its own version.

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