invalid message type

rosmsg

asked 2013-11-24 20:41:14 -0600

pelment
47 ●6 ●6 ●13

updated 2013-11-24 20:43:25 -0600

I try to use my own messages. I created msg file named RopEvent:

 int32 value
 string name
 string comment

I can't publish message using rostopic pub. I try to proceed

rostopic pub rop_client rop_client/RopEvent 14 "Test" "Test"

But I receive an error

ERROR: invalid message type: rop_client/RopEvent.
If this is a valid message type, perhaps you need to type 'rosmake rop_client'

I type this, it makes package correctly, but message error still pops up. If I type rostopic list -v, I can see a string

* /rop_client [rop_client/RopEvent] 1 subscriber

'rosmsg list' shows me that my message exists, 'rosmsg show' finds message and shows it. What's wrong?

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I have the same problem. 'rosmsg show package_name/Msgname' works fine 'rostopic pub /xyz package_name/Msgname' doesn't.
UPDATED: After I edited the package.yml and CMakeLists.txt to actually compile the messages, it worked fine.

syrnick ( 2014-05-26 16:25:03 -0600 )edit

And which commands were missed?

pelment ( 2014-05-27 07:56:53 -0600 )edit

I think, these were the core changes and commands: in package.xml:

    <build_depend>message_generation</build_depend>
    <run_depend>message_runtime</run_depend>

In CMakeLists.txt

find_package(catkin REQUIRED COMPONENTS
  message_generation std_msgs
)

add_message_files(
  FILES
  Dummy.msg
  Hit.msg
)

Commands from the catkin workspace:

catkin_make 
catkin_make install
source devel/setup.bash

syrnick ( 2014-05-27 18:33:58 -0600 )edit

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answered 2014-04-02 16:19:52 -0600

tfoote

58457 ●128 ●550 ●526 http://www.ros.org/

You need to make sure that the compiled packages of your custom messages are in your environment when you run rostopic. That's the usual cause of this problem.

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answered 2013-12-01 20:23:51 -0600

pelment
47 ●6 ●6 ●13

My conclusions: I can send messages correctly from my own code, so I think that it isn't necessary to check messages using rostopic. I check it from my own nodes. It will be vary kind of anyone experienced to comment situation.

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