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Getting started

The purpose of this example is to introduce the different concepts of Zenoh-Flow by creating a simple application that generates "Hello, World!" types of greetings.

How to run

Build (for Rust nodes only)

We first generate the different shared libraries of the different nodes.

cd ~/dev/zenoh-flow-examples/getting-started/nodes/rust/ && cargo build --workspace

Update the paths

For each YAML file in the list below, check that the paths and filenames are correct:

  • data-flow.yaml
  • Rust nodes:
    • nodes/rust/period-miss-detector/period-miss-detector.yaml
    • nodes/rust/file-writer/file-writer.yaml
  • Python nodes:
    • nodes/python/period-miss-detector/period-miss-detector.yaml
    • nodes/python/file-writer/file-writer.yaml

💡 Note that you actually only need to update the files of the nodes you are going to use — which could be a mix of Python and Rust nodes.

Launch

1st terminal: Zenoh

cd ~/dev/zenoh && ./target/debug/zenohd -c ~/.config/zenoh-flow/zenoh.json

2nd terminal: Zenoh-Flow daemon

cd ~/dev/zenoh-flow/ && ./target/debug/zenoh-flow-daemon -c ~/.config/zenoh-flow/runtime.yaml

3rd terminal: launch the flow

cd ~/dev/zenoh-flow && ./target/debug/zfctl launch ~/dev/zenoh-flow-examples/getting-started/data-flow.yaml

Then, if the flow was successfully launched, put values at regular intervals:

# If you have compiled the `z_put` example of Zenoh in debug
$ZENOH/target/debug/examples/z_put -k "zf/getting-started/hello" -v "Alice"

# If you have enabled the REST plugin of Zenoh
curl -X PUT -H "content-type:text/plain" -d 'Bob' http://localhost:8000/zf/getting-started/hello