(post withdrawn by author)
If scheduling a downlink works, then sending the first uplink as a confirmed uplink might work as well?
I assume you’re using EU863-870? What you want seems to be implemented for US902-928, then shown as “initial” in the Trace part of the gateway Traffic page in TTN Console:
Related: Does ADR require the use of confirmed uplinks?, ADR is not working (nucleo - raspberry -italy) and:
(Update: I removed some unrelated things, which did not apply to this very use case.)
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