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I'm trying to populate a service response array in a Python coded service node and I'm getting an assertion violations from one of the IDL generated files. The service Service.srv definition is the following:

string req
---
my_interfaces/MyCustomResponse[] resp

Where MyCustomResponse.msg is defined as following:

int64 an_id

The runtime error is something like:

python3: /projects/my_proj/build/my_interfaces/rosidl_generator_py/my_interfaces/msg/_my_custom_response_s.c:53: my_interfaces__msg__my_custon_response__convert_from_py: Assertion `strncmp("my_interfaces.msg._my_custom_response.MyCustomResponse", full_classname_dest, 54) == 0' failed.

If I remove the array to make the response just a simple MyCustomResponse response, everything works fine. Are there any issues with the arrays of custom messages in Python written services (the C++ counterpart works fine).

Thanks.

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  • $\begingroup$ Please consider sharing exactly how you're using it in a minimal example to get the best help. $\endgroup$ Commented Sep 16, 2024 at 8:57

1 Answer 1

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can you update your Python service advertiser (callback) function like this for a test.

def service_callback(self, request, response):
    # Populate the response array
    response.resp = []  # Initialize the array

    for i in range(5):  # Example of adding 5 items to the array
        custom_resp = MyCustomResponse()
        custom_resp.an_id = i
        response.resp.append(custom_resp)  # Add to the response array

    return response
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