I have two packages, gps_driver and gps_msg.
Driver: gps_driver->gps_driver->python->gps_driver.py Msg: gps_msg->msg->GpsMsg.msg In the relevant package.xml, gps_msg is listed as a dependency for gps_driver. The gps_driver has the following line:
from gps_msg.msg import GpsMsg
which causes the error: ModuleNotFoundError: No module named gps_msg
Both packages are in the .src folder of the same workspace, everything is built.
Check in the GPS Msg package (not your package) if the message is being set in the CMakeLists.txt. Something like this:
set(msg_files
"msg/GpsMsg.msg"
...
)
...
rosidl_generate_interfaces(${PROJECT_NAME}
${msg_files}
...
DEPENDENCIES std_msgs sensor_msgs ...
)
ament_export_dependencies(rosidl_default_runtime)
ament_package()
Also, check if the name in the project is the same in both your driver package and message package (project(gps_msgs) in CMakeLists.txt and <name>gps_msgs</name> in package.xml).
And, after building it, don't forget to source your workspace.
