Unlikely to help, but you never know:
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Can you run the
curlcommand manually?There is a known issues with some programming languages, especially Java (and Android apps written in Java) to access domain names that hold underscores. (Officially, underscores are not allowed in the hostname part of a URL.)
I don’t know what is used to create the Swagger UI pages.As the request are made by the Swagger UI JavaScript frontend code, this should not matter. Also, I doubt one would get a 204 No Data in that case. But who knows… -
Are you using any Decoder in the Payload Formats? (That should also work, but, e.g., nested result objects are persisted as text. Maybe there are some cases that are not persisted at all. Again, not likely, but who knows…)
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Are you running any other integrations? (Again, should not matter…)
Asides: the Data Integration works fine for me right now, but I’m not using underscores anywhere. The default authorization key you’re using should be fine. And you’re right that TTN Console should also show data from that integration (though sometimes it takes some time); see Why application data is shown as historical?