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If you want to use std_srvs in one of your packages via:

from std_srvs.srv import Trigger, TriggerRequest, TriggerResponse

Make sure your CMakeLists.txt file contains references to std_srvs:

find_package(catkin REQUIRED COMPONENTS
  rospy
  std_msgs
  std_srvs # <-- HERE
  message_generation
)

generate_messages(
  DEPENDENCIES
  std_msgs
  std_srvs # <-- HERE
)

catkin_package(
  CATKIN_DEPENDS rospy std_msgs std_srvs message_runtime # <-- HERE
)

And your package.xml file contains:

<!-- standard service dependencies -->
<build_depend>std_srvs</build_depend>
<run_depend>std_srvs</run_depend>

If you want to use std_srvs in one of your packages via:

from std_srvs.srv import Trigger, TriggerRequest, TriggerResponse

Make sure your CMakeLists.txt file contains references to std_srvs:

find_package(catkin REQUIRED COMPONENTS
  rospy
  std_msgs
  std_srvs # <-- HERE
  message_generation
)

generate_messages(
  DEPENDENCIES
  std_msgs
  std_srvs # <-- HERE
)

catkin_package(
  CATKIN_DEPENDS rospy std_msgs std_srvs message_runtime # <-- HERE
)

And your package.xml file contains:

<!-- standard service dependencies -->
<build_depend>std_srvs</build_depend>
<run_depend>std_srvs</run_depend>