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I am not sure if your code is correct based on this "A Gentle Introduction to ROS" Chapter: Services - e.g. it seems like you don't have a pointer to the function there. Can you rework your code based on these examples?

Overall, there is maybe another approach worth trying:

Maybe this answer and it's gist could help you?

I would try to use the wrapper to non-blocking 'n' service calls of the spawn_turtle_service.

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