'ros2 param list' stuck when node create with namespace

[realdream]

Bug report

Required Info:

• Operating System:
  • Ubuntu 16.04
• Installation type:
  • from source
• Version or commit hash:
  • release bouncy
• DDS implementation:
  • Fast-RTPS
• Client library (if applicable):
  • rclcpp

Steps to reproduce issue

ros2 run demo_nodes_cpp talker __ns:=/demo
ros2 param list

Actual behavior

the 'ros2 param list' stuck forever with out output any message
'ros2 param set/get' also failed

---

edit by @sloretz for waffle.io
blocked by #105

[sloretz]

Thanks for the bug report @realdream . I can reproduce ros2 param list being stuck forever and being unable to get/set parameters using bouncy patch release 1 installed from debs.

Output when trying to get or set a parameter on a node with a namespace set.

developer@bbd2c434522d:~$ ros2 param set talker foo true
Wait for service timed out
developer@bbd2c434522d:~$ ros2 param get talker foo
Wait for service timed out
developer@bbd2c434522d:~$ ros2 param get /demo/talker foo
Node not found
developer@bbd2c434522d:~$ ros2 param set /demo/talker foo true
Node not found

Services and topics

developer@bbd2c434522d:~$ ros2 service list
/demo/talker/describe_parameters
/demo/talker/get_parameter_types
/demo/talker/get_parameters
/demo/talker/list_parameters
/demo/talker/set_parameters
/demo/talker/set_parameters_atomically
developer@bbd2c434522d:~$ ros2 topic list
/clock
/demo/chatter
/demo/parameter_events

Possibly related to #105 ? list gets all node names from ros2node's api

ros2cli/ros2param/ros2param/verb/list.py

Lines 42 to 43 in be38ea4

	node_names = get_node_names(
	node=node, include_hidden_nodes=args.include_hidden_nodes)

Then it creates a client with the node name assuming it will be a single token.

ros2cli/ros2param/ros2param/verb/list.py

Lines 55 to 57 in be38ea4

	client = node.create_client(
	ListParameters,
	'/{node_name}/list_parameters'.format_map(locals()))

[mjcarroll]

I agree with your assessment @sloretz. This is going to be dependent on the rmw returning a list of namespaced names, in addition to just the node names.