I am trying to make use of depthimagetolaserscan. However, it subscribes to the image topic with a Reliable Reliability QoS profile while the topic of the image is being published with a Best_Effort profile. So they are not compatible.

~/dev_ws$ ros2 topic info /camera/depth/image_raw --verbose
Type: sensor_msgs/msg/Image

Publisher count: 1

Node name: depth_camera_controller
Node namespace: /
Topic type: sensor_msgs/msg/Image
Endpoint type: PUBLISHER
GID: c0.56.10.01.27.68.be.2d.2a.b1.2c.eb.00.00.4d.03.00.00.00.00.00.00.00.00
QoS profile:
  Reliability: BEST_EFFORT
  Durability: VOLATILE
  Lifespan: 9223372036854775807 nanoseconds
  Deadline: 9223372036854775807 nanoseconds
  Liveliness: AUTOMATIC
  Liveliness lease duration: 9223372036854775807 nanoseconds

Subscription count: 3

Node name: rtabmapviz
Node namespace: /
Topic type: sensor_msgs/msg/Image
Endpoint type: SUBSCRIPTION
GID: 3b.ac.10.01.ba.bd.e9.f3.5d.91.dd.83.00.00.3c.04.00.00.00.00.00.00.00.00
QoS profile:
  Reliability: BEST_EFFORT
  Durability: VOLATILE
  Lifespan: 9223372036854775807 nanoseconds
  Deadline: 9223372036854775807 nanoseconds
  Liveliness: AUTOMATIC
  Liveliness lease duration: 9223372036854775807 nanoseconds

Node name: rtabmap
Node namespace: /
Topic type: sensor_msgs/msg/Image
Endpoint type: SUBSCRIPTION
GID: 3c.d0.10.01.84.b8.c6.33.85.74.5f.b5.00.00.7a.04.00.00.00.00.00.00.00.00
QoS profile:
  Reliability: BEST_EFFORT
  Durability: VOLATILE
  Lifespan: 9223372036854775807 nanoseconds
  Deadline: 9223372036854775807 nanoseconds
  Liveliness: AUTOMATIC
  Liveliness lease duration: 9223372036854775807 nanoseconds

Node name: depthimage_to_laserscan_node
Node namespace: /
Topic type: sensor_msgs/msg/Image
Endpoint type: SUBSCRIPTION
GID: b8.a6.10.01.3b.22.48.a2.df.78.c2.6f.00.00.16.04.00.00.00.00.00.00.00.00
QoS profile:
  Reliability: RELIABLE
  Durability: VOLATILE
  Lifespan: 9223372036854775807 nanoseconds
  Deadline: 9223372036854775807 nanoseconds
  Liveliness: AUTOMATIC
  Liveliness lease duration: 9223372036854775807 nanoseconds

I managed to change the QoS on RTABMAP because it has a parameter to do so, but how can I change it in the depthimagetolaserscan node?

The depthimagetolaserscan has this parameters:

~/dev_ws$ ros2 service call /depthimage_to_laserscan_node/list_parameters rcl_interfaces/srv/ListParameters
requester: making request: rcl_interfaces.srv.ListParameters_Request(prefixes=[], depth=0)

response:
rcl_interfaces.srv.ListParameters_Response(result=rcl_interfaces.msg.ListParametersResult(names=['output_frame', 'qos_overrides./parameter_events.publisher.depth', 'qos_overrides./parameter_events.publisher.durability', 'qos_overrides./parameter_events.publisher.history', 'qos_overrides./parameter_events.publisher.reliability', 'range_max', 'range_min', 'scan_height', 'scan_time', 'use_sim_time'], prefixes=['qos_overrides./parameter_events.publisher']))

I would like to change the QoS either in the depth camera controller or in the depthimagetolaserScan to make it work.

Thank you!