Here’s a library and script developed in Python 2.7 as far as I know covering Meross sensors. You may be able to modify it for use if your Python 3.7 route doesn’t work. I imagine you’ve enough info to be working with at this stage.
My advice as always to HG users is if you are making hardware purchases based around HG make sure the protocol is supported and there’s a MIG already in place for it. While I still use HG it’s mainly for its X10 support. Every other protocol I use is supported straight out of the box with HASSIO (Home Assistant) including your Meross sensors.