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ROS2 QoS Calculator

Set a publisher and subscription QoS profile and see whether they'll actually connect. The compatibility rules here mirror rmw_dds_common::qos_profile_check_compatible policy-for-policy, so the verdict matches what ROS2 itself would report.

How to use the ROS2 QoS Calculator

  1. 1Set the publisher’s QoS profile, or start from a preset such as Sensor data.
  2. 2Set the subscription’s QoS profile the same way.
  3. 3The Compatibility panel tells you whether they will connect and, if not, which setting to change.

Publisher

Subscription

Compatibility

Compatible — this publisher and subscription will connect.
✓
Reliability

Compatible.

✓
Durability

Compatible.

✓
Deadline

Compatible.

✓
Liveliness

Compatible.

✓
Liveliness lease duration

Compatible.

How QoS matching works

A subscription requests a QoS policy and a publisher offers one. They can connect only if the publisher's offer is at least as strict as what the subscription requires — e.g. a subscription requesting Reliable needs a Reliable publisher (a Best Effort publisher won't satisfy it), but a subscription requesting Best Effort is happy with either.

History (Keep Last / Keep All) and Lifespan only affect local buffering and message expiry — they never block a connection, which is why they're not part of the compatibility check above.