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# Basic Configuration Example
This example extends the configuration options of a trivial HelloWorld by letting the user specify properties of
entities such as durability, reliability or specify the transport protocol to be used, among other possibilities. This
could be useful, for example, to quickly test whether two endpoints are compatible and hence would match.
## Execution instructions
To launch this test open two different consoles:
In the first one launch: ./BasicConfigurationExample publisher (or BasicConfigurationExample.exe publisher on windows).
In the second one: ./BasicConfigurationExample subscriber (or BasicConfigurationExample.exe subscriber on windows).
## Arguments
First argument is `publisher` or `subscriber` and then the rest of arguments are read unordered
```sh
Usage: BasicConfigurationExample <publisher|subscriber>
General options:
-h --help
Produce help message.
Publisher options:
-t <topic_name> --topic=<topic_name>
Topic name (Default: HelloWorldTopic).
-d <id> --domain=<id>
DDS domain ID (Default: 0).
-w <num> --wait=<num>
Number of matched subscribers required to publish (Default:
0 => does not wait).
-s <num> --samples=<num>
Number of samples to send (Default: 0 => infinite samples).
-i <num> --interval=<num>
Time between samples in milliseconds (Default: 100).
-a --async
Asynchronous publish mode (synchronous by default).
--transport=<shm|udp|udpv6>
Use only shared-memory, UDPv4, or UDPv6 transport.If not
set, use Fast DDS default transports (depending on the
scenario it will use the most efficient one: data-sharing
delivery mechanism > shared-memory > UDP ).
Subscriber options:
-t <topic_name> --topic=<topic_name>
Topic name (Default: HelloWorldTopic).
-d <id> --domain=<id>
DDS domain ID (Default: 0).
-s <num> --samples=<num>
Number of samples to wait for (Default: 0 => infinite
samples).
--transport=<shm|udp|udpv6>
Use only shared-memory, UDPv4, or UDPv6 transport.If not
set, use Fast DDS default transports (depending on the
scenario it will use the most efficient one: data-sharing
delivery mechanism > shared-memory > UDP ).
QoS options:
-r --reliable
Set reliability to reliable (best-effort by default).
--transient
Set durability to transient local (volatile by default,
ineffective when not reliable).
Discovery options:
--ttl
Set multicast discovery Time To Live on IPv4 or Hop Limit
for IPv6. If not set, uses Fast-DDS default (1 hop).
Increase it to avoid discovery issues on scenarios with
several routers. Maximum: 255.
```
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