Meross put out a firmware update that patched some vulnarabilites that prevent the same MessageId, Sign, and Timestamp from being used. I managed to fix it and created a pull request on Github. Firmware update by coKaliszewski · Pull Request #4 · ithinkdancan/hubitat-meross (github.com) You'll need a Key that is provided from Meross when you login and can get it by running this script (github.com). You'll need to have Python installed to run it. The key is unique to your account so you only need to get it once.
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