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There's the get_parameter_or method:

http://docs.ros2.org/bouncy/api/rclcpp/classrclcpp_1_1_node.html#ae5d51004e6e4fc32194251587eb8711a

Which would allow you to do something like this:

int ip_port_;
node->get_parameter_or("ip_port", &ip_port_, 80);

And recently the get_parameter_or_set which will get it if set, and if not it will set the parameter to the "default" you gave and then return it.

There's the get_parameter_or method:

http://docs.ros2.org/bouncy/api/rclcpp/classrclcpp_1_1_node.html#ae5d51004e6e4fc32194251587eb8711a

Which would allow you to do something like this:

int ip_port_;
node->get_parameter_or("ip_port", &ip_port_, ip_port_, 80);

And recently the get_parameter_or_set which will get it if set, and if not it will set the parameter to the "default" you gave and then return it.