Cannot load mesage class / messages not being built

[enricoande]

I am trying to use ros-imc-broker as a bridge between ROS and Dune. At this stage, I am running simulations in Dune (e.g. lauv-xplore-1.ini) and intend to subscribe to the generated messages, e.g. /IMC/In/Temperature, IMC/In/Depth, IMC/In/Pressure, etc.

I am using ROS Noetic on Ubuntu 20.04. I had to update the code to C++11, by replacing lines 61 & 63 of params_changer_node.cpp as follows:

61  static constexpr float c_entity_update = 60.0f;
63  static constexpr float c_entity_deactivation = 200.0f;

I am not compiling the code in a docker container, but rather as a normal ROS package. I am also running dune and neptus for the simulations.

With rostopic list, I can see the full list of messages. By running the Dune simulator on its own (i.e. without initialising a simulated deployment in Neptus), rqt_graph shows that the /IMC/In/Temperature message is being passed by /ros_imc_broker_node to the /settings node.

However, running
rostopic echo /IMC/In/Temperature
returns the following error:
ERROR: Cannot load message class for [imc/Temperature]. Are your messages built?

I would be tempted to update the CMakeList.txt file, but before going down that route, I was just wondering if you could quickly point out to me where I am going wrong?

Many thanks!

[pettsol]

Bump on this one.

I am also getting "ERROR: Cannot load message class for [message]. Are your messages built?" Did anyone find a solution to this problem? I noticed someone had a similar problem a few years back (#1 ), but adding -pthread to the CMake file does not work. I am also on Ubuntu 20.04 & ROS Noetic, trying to bridge DUNE and ROS.

Any ideas?