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 | 1 | initial version |
I'll answer your question to best of my ability.
localhost:
127.0.0.1is the loopback address (also known as localhost).0.0.0.0is a non-routable meta-address used to designate an invalid, unknown or non applicable target (a no particular address placeholder).
That tutorial that you linked to is incorrect. ROS_HOSTNAME is for hostnames such as localhost, not IP addresses as that's what ROS_IP is for.
You can use either ROS_IP or ROS_HOSTNAME. If you have both set, ROS_HOSTNAME will take precedence.
| | 2 | No.2 Revision |
I'll answer your question to best of my ability.
localhost:
127.0.0.1is the loopback address (also known as localhost).0.0.0.0is a non-routable meta-address used to designate an invalid, unknown or non applicable target (a no particular address placeholder).
That tutorial that you linked to is incorrect. ROS_HOSTNAME is for hostnames such as localhost, not IP addresses as that's what ROS_IP is for.
You can use either ROS_IP or ROS_HOSTNAME. If you have both set, ROS_HOSTNAME will take precedence.
| | 3 | No.3 Revision |
I'll answer your question to best of my ability.
localhost:
127.0.0.1is the loopback address (also known as localhost).0.0.0.0is a non-routable meta-address used to designate an invalid, unknown or non applicable target (a no particular address placeholder).
That tutorial that you linked to is incorrect. ROS_HOSTNAME is for hostnames such as localhost, not IP addresses as that's what ROS_IP is for.
You can use either ROS_IP or ROS_HOSTNAME. If you have both set, ROS_HOSTNAME will take precedence.
As for the bottom line, it's a matter of preference as to which to use. I prefer ROS_HOSTNAME because I can use it in launch files in the <machine> tag and it's easier to remember hostnames vs. IP addresses.
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