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[](https://maven-badges.herokuapp.com/maven-central/io.xpipe/xpipe-beacon)
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[](https://javadoc.io/doc/io.xpipe/xpipe-beacon)
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2022-03-09 11:30:13 +13:00
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## X-Pipe Beacon
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The X-Pipe beacon component is responsible for handling all communications between the X-Pipe daemon
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and the various programming language APIs and the CLI. It provides an API that supports all kinds
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of different operations.
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### Inner Workings
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- The underlying inter-process communication is realized through
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TCP sockets on port `21721` on Windows and `21722` on Linux.
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- The data structures and exchange protocols are specified in the
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[io.xpipe.beacon.exchange package](src/main/java/io/xpipe/beacon/exchange).
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- Every exchange is initiated from the outside by sending a request message to the X-Pipe daemon.
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The daemon then always sends a response message.
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- The header information of a message is formatted in the json format.
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As a result, all data structures exchanged must be serializable/deserializable with jackson.
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- Both the requests and responses can optionally include content in a body.
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A body is initiated with two new lines (`\n`).
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- The body is split into segments of max length `65536`.
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Each segment is preceded by four bytes that specify the length of the next segment.
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In case the next segment has a length of less than `65536` bytes, we know that the end of the body has been reached.
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This way the socket communication can handle payloads of unknown length.
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2022-06-18 10:29:41 +12:00
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## Configuration
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#### Custom port
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The default port can be changed by passing the property `io.xpipe.beacon.port=<port>` to both the daemon and APIs.
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Note that if both sides do not have the same port setting, they won't be able to reach each other.
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#### Custom launch command
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The beacon API also supports launching the daemon automatically in case it is not started yet.
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By default, it launches the daemon of the local X-Pipe installation.
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It is possible to pass a custom launch command with the property `io.xpipe.beacon.customDaemonCommand=<cmd>`
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and pass arguments to it using the property `io.xpipe.beacon.daemonArgs=<args>`.
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This allows for a custom launch behaviour in a testing/development environment.
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Note that the `<cmd>` value has to be a single property string, which can be prone to formatting errors
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#### Verbose output
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By passing the property `io.xpipe.beacon.printMessages=true`, it is possible to print debug information
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about the underlying communications.
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In case the `io.xpipe.beacon.printDaemonOutput` property is set, the output of the daemon can also be
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printed by passing the property `io.xpipe.beacon.debugExecOutput=true`.
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#### Daemon debug mode
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In case the daemon is started by the beacon, it is possible to customize in which mode the daemon will start up.
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By passing the property `io.xpipe.beacon.launchDebugDaemon=true`, the daemon is started in debug mode,
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i.e. will log more information and enable a few other options.
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By passing the property `io.xpipe.beacon.attachDebuggerToDaemon=true`, it is possible to launch a daemon
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in a mode where it is waiting to attach to a debugger first prior to starting up.
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