Hi everyone
On ROS2 Navigation Advanced course, I get the next error when sending values to the /battery topic:
Thanks again
Hi everyone
On ROS2 Navigation Advanced course, I get the next error when sending values to the /battery topic:
Thanks again
Hello @lfernandez,
that error when you run ros2 interface proto sensor_msgs/msg/BatteryState
is strange.
When I run ros2 interface proto sensor_msgs/msg/BatteryState
I get this output:
"header:
stamp:
sec: 0
nanosec: 0
frame_id: ''
voltage: 0.0
temperature: 0.0
current: 0.0
charge: 0.0
capacity: 0.0
design_capacity: 0.0
percentage: 0.0
power_supply_status: 0
power_supply_health: 0
power_supply_technology: 0
present: false
cell_voltage: []
cell_temperature: []
location: ''
serial_number: ''
"
What unit number and exercise number are you on?
What is the output if you run this command?:
ros2 interface list | grep Battery
Could you also please post the full error message, so I can be sure we are not missing any important information?
Thanks,
Roberto
Hi @rzegers
Yes, it’s strange. I have a local installation and it works ok.
I’m on the 2nd unit, exercise 2.1
The error:
user:~/ros2_ws$ ros2 interface proto sensor_msgs/msg/BatteryState
Traceback (most recent call last):
File "/opt/ros/galactic/bin/ros2", line 11, in <module>
load_entry_point('ros2cli==0.13.3', 'console_scripts', 'ros2')()
File "/opt/ros/galactic/lib/python3.8/site-packages/ros2cli/cli.py", line 67, in main
rc = extension.main(parser=parser, args=args)
File "/opt/ros/galactic/lib/python3.8/site-packages/ros2interface/command/interface.py", line 35, in main
return extension.main(args=args)
File "/opt/ros/galactic/lib/python3.8/site-packages/ros2interface/verb/proto.py", line 33, in main
yaml = interface_to_yaml(args.type)
File "/opt/ros/galactic/lib/python3.8/site-packages/ros2interface/api/__init__.py", line 54, in interface_to_yaml
return message_to_yaml(instance)
File "/opt/ros/galactic/lib/python3.8/site-packages/rosidl_runtime_py/convert.py", line 91, in message_to_yaml
message_to_ordereddict(
File "/opt/ros/galactic/lib/python3.8/site-packages/rosidl_runtime_py/convert.py", line 178, in message_to_ordereddict
for field_name, field_type in zip(msg.__slots__, msg.SLOT_TYPES):
AttributeError: 'BatteryState' object has no attribute 'SLOT_TYPES'
The message output seems to be ok
Thanks again
Hi @lfernandez,
thanks for your feedback, at this point I am pretty confident that the error that you see is because of an issue on our side, not your side. I have executed the same command when in unit 1 and 3 of the course and it works ok. Only when in unit 2 there is this issue.
We are investigating what is wrong with unit 2.
I hope you are able to continue with the course and this does not affect your learning.
We will post here once we know what the issue is.
I apologize for the inconvenience and thank you for your patience,
Roberto
Definitely, that is an error in the installation of our system. We are correcting it now. It will be ready next week.
I apologize for the inconvenience
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