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Configuration via environment variables
=======================================
In a similar way you can programatically customize the behavior of your
nodes or specify some options when you advertise a topic, it is possible to
use an environment variable to tweak the behavior of Ignition Transport.
Next you can see a description of the available environment variables:
* **IGN_PARITION**
* *Value allowed*: Any partition value
* *Description*: Specifies a partition name for all the nodes declared
inside this process. Note that an alternative partition name declared
programatically and passed to the constructor of a Node class will take
priorityover *IGN_PARTITION*.
* **IGN_IP**
* *Value allowed*: Any local IP address
* *Description*: This setting is needed in situations where you have
multiple IP addresses for a computer and need to force Ignition
Transport to use a particular one. This setting is only required if you
advertise a topic or a service. If you are only subscribed to topics or
requesting services you don't need to use this option because the
discovery service will try all the available network interfaces during
the search of the topic/service.
* **IGN_VERBOSE**
* *Value allowed*: 1/0
* *Description*: Show debug information.
* **IGN_TRANSPORT_USERNAME**
* *Value allowed*: Any string value
* *Description*: A username, used in combination with
*IGN_TRANSPORT_PASSWORD*, for basic authentication. Authentication is
enabled when both *IGN_TRANSPORT_USERNAME* and *IGN_TRANSPORT_PASSWORD*
are specified.
* **IGN_TRANSPORT_PASSWORD**
* *Value allowed*: Any string value
* *Description*: A password, used in combination with
*IGN_TRANSPORT_USERNAME*, for basic authentication. Authentication is
enabled when both *IGN_TRANSPORT_USERNAME* and *IGN_TRANSPORT_PASSWORD*
are specified.
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