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but i retested it with /dev/ttyACM0

can you please check again? It's ttyAMC0, not ttyACM0.

but i retested it with /dev/ttyACM0

can you please check again? It's ttyAMC0, not ttyACM0.

After you've changed the launch file / parameters, update your original post to show us the output.

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