Clients
The nats-server doesn't come bundled with any clients. But most client libraries come with sample programs that allow you to publish, subscribe, send requests and reply messages.
If you have a client library installed, you can try using a bundled client. Otherwise, you can easily install some clients.
If you have Go installed:
Or download a zip file
You can install pre-built binaries from the go-nats-examples repo
Testing your setup
Open a terminal and start a nats-server:
On another terminal session start a subscriber:
Note that when the client connected, the server didn't log anything interesting because server output is relatively quiet unless something interesting happens.
To make the server output more lively, you can specify the -V flag to enable logging of server protocol tracing messages. Go ahead and <ctrl>+c the process running the server, and restart the server with the -V flag:
If you had created a subscriber, you should notice output on the subscriber telling you that it disconnected, and reconnected. The server output above is more interesting. You can see the subscriber send a CONNECT protocol message and a PING which was responded to by the server with a PONG.
You can learn more about the NATS protocol here, but more interesting than the protocol description is an interactive demo.
On a third terminal, publish your first message:
On the subscriber window you should see:
Testing Against a Remote Server
If the NATS server were running in a different machine or a different port, you'd have to specify that to the client by specifying a NATS URL. NATS URLs take the form of: nats://<server>:<port> and tls://<server>:<port>. URLs with a tls protocol sport a secured TLS connection.
If you want to try on a remote server, the NATS team maintains a demo server you can reach at demo.nats.io.
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