Sending a list in ServiceRequest

[philianeles]

Hi, I am trying to send a list of "va" and "ha" values in a ServiceREquest, on line 51 below:

And running into the error that can also be seen above. Is there a way to send a list in a ServiceRequest?

Thank you for the help!

[gonzalocasas]

@philianeles this is actually python complaining, not roslibpy, you're trying to create a dictionary with two values, but the dict constructor takes only key/value pairs. If va contains the keys and ha the values, you can create it with:

data = {}
data[va] = ha

notice that va is not the key, but the value of va is... that is not the case if you write dict(va=ha) in which va will literally be the key.

But service messages have a much stricter format than what your code implies... if you use the code above, your service request will have keys that change dynamically based on the content of VA_user_input, which doesn't seem like what ROS msgs support at all. If you add the service msg type here, I can probably point you in the right direction...

[philianeles]

Yes! my bad, the correct version should have been this:

service = roslibpy.Service(ros_client, '/plt_ros/cmd/pose_set_absolute', 'plt_msgs/SetPose')
for va, ha in zip(VA_user_input, HA_user_input):
      request = roslibpy.ServiceRequest(dict(VA=va, HA=ha))
      call_service(service, request)

which would imply having keys that change dynamically... plt_msgs/SetPose is a (custom) service msg:

float32 HA
float32 VA
---
ResponseCode response

[gonzalocasas]

aha! so, does that change fix the problem? can we close the issue? or is there something else still open?

[philianeles]

not sure yet - I could not test it with the hardware, not connected atm, but will follow-up here asap!