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rmw
master
C API providing a middleware abstraction layer which is used to implement the rest of ROS.
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QoS Liveliness Changed information provided by a subscription. More...
#include <liveliness_changed.h>
Public Attributes | |
| int32_t | alive_count |
| int32_t | not_alive_count |
| int32_t | alive_count_change |
| The change in the alive_count since the status was last read. More... | |
| int32_t | not_alive_count_change |
| The change in the not_alive_count since the status was last read. More... | |
QoS Liveliness Changed information provided by a subscription.
| int32_t rmw_liveliness_changed_status_t::alive_count |
The total number of currently active Publishers which publish to the topic associated with the Subscription. This count increases when a newly matched Publisher asserts its liveliness for the first time or when a Publisher previously considered to be not alive reasserts its liveliness. The count decreases when a Publisher considered alive fails to assert its liveliness and becomes not alive, whether because it was deleted normally or for some other reason.
| int32_t rmw_liveliness_changed_status_t::not_alive_count |
The total count of current Publishers which publish to the topic associated with the Subscription that are no longer asserting their liveliness. This count increases when a Publisher considered alive fails to assert its liveliness and becomes not alive for some reason other than the normal deletion of that Publisher. It decreases when a previously not alive Publisher either reasserts its liveliness or is deleted normally.
| int32_t rmw_liveliness_changed_status_t::alive_count_change |
The change in the alive_count since the status was last read.
| int32_t rmw_liveliness_changed_status_t::not_alive_count_change |
The change in the not_alive_count since the status was last read.
1.8.17