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ESP32 never had soft timers. By chance, Timer(-1) or actually any timer number would have selected a valid hard timer. Since some newer device did not support two timer groups, the check for valid timer numbers has been tightened.

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@echo-lalia
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@LucienMP
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@Josverl
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Josverl Oct 13, 2025
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@LucienMP
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Answer selected by Josverl
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