I want to publish /cmd_vel topic from command line.
ros2 topic pub /cmd_vel geometry_msgs/msg/Twist "linear: x: 0.1, y: 0.0, z: 0.0 angular: x: 0.0, y: 0.0, z: 0.0"
But it gives below error :
Traceback (most recent call last):
File "/opt/ros/foxy/bin/ros2", line 11, in <module>
load_entry_point('ros2cli==0.9.7', 'console_scripts', 'ros2')()
File "/opt/ros/foxy/lib/python3.8/site-packages/ros2cli/cli.py", line 67, in main
rc = extension.main(parser=parser, args=args)
File "/opt/ros/foxy/lib/python3.8/site-packages/ros2topic/command/topic.py", line 41, in main
return extension.main(args=args)
File "/opt/ros/foxy/lib/python3.8/site-packages/ros2topic/verb/pub.py", line 93, in main
return main(args)
File "/opt/ros/foxy/lib/python3.8/site-packages/ros2topic/verb/pub.py", line 103, in main
return publisher(
File "/opt/ros/foxy/lib/python3.8/site-packages/ros2topic/verb/pub.py", line 126, in publisher
values_dictionary = yaml.safe_load(values)
File "/usr/lib/python3/dist-packages/yaml/__init__.py", line 162, in safe_load
return load(stream, SafeLoader)
File "/usr/lib/python3/dist-packages/yaml/__init__.py", line 114, in load
return loader.get_single_data()
File "/usr/lib/python3/dist-packages/yaml/constructor.py", line 49, in get_single_data
node = self.get_single_node()
File "/usr/lib/python3/dist-packages/yaml/composer.py", line 36, in get_single_node
document = self.compose_document()
File "/usr/lib/python3/dist-packages/yaml/composer.py", line 55, in compose_document
node = self.compose_node(None, None)
File "/usr/lib/python3/dist-packages/yaml/composer.py", line 84, in compose_node
node = self.compose_mapping_node(anchor)
File "/usr/lib/python3/dist-packages/yaml/composer.py", line 127, in compose_mapping_node
while not self.check_event(MappingEndEvent):
File "/usr/lib/python3/dist-packages/yaml/parser.py", line 98, in check_event
self.current_event = self.state()
File "/usr/lib/python3/dist-packages/yaml/parser.py", line 428, in parse_block_mapping_key
if self.check_token(KeyToken):
File "/usr/lib/python3/dist-packages/yaml/scanner.py", line 116, in check_token
self.fetch_more_tokens()
File "/usr/lib/python3/dist-packages/yaml/scanner.py", line 223, in fetch_more_tokens
return self.fetch_value()
File "/usr/lib/python3/dist-packages/yaml/scanner.py", line 577, in fetch_value
raise ScannerError(None, None,
yaml.scanner.ScannerError: mapping values are not allowed here
in "<unicode string>", line 1, column 10:
linear: x: 0.1, y: 0.0, z: 0.0 angular: x ...