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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
Andrea
That's because data in advertisement is encrypted, see https://github.com/Magalex2x14/LYWSD03MMC-info#encryption When connected there is no such encryption! And any device can connect without pairing so it all makes very little sense.
That's why I suggested alternative firmware - there is no such encryption nonsense there. And the firmware was developed from scratch (with Telink SDK available on github) and is opensource.