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BG18536179121/01/2020
Nice device ;-)
I have not even tried the original firmware, because I don't wanted to have a always-on device connected to my home network and the cloud (perhaps I'm a little bit paranoid).
I've flashed it with tasmota via serial port without any problems, using a ch340g usb-to-serial adapter with a additional 3.3V-supply.
I don't use it in a real smart Home scenario yet, only as a convenience time switch, to turn on a lamp at sunset, and turn it off at sunrise.
There is no galvanic isolation between any of the terminals or between the terminals and the inside of the antenna. I don't think the isolation of the antenna cable can reliable withstand 230V mains voltage, so it's necessary to provide some additional protection against contact, e.g. mount everything in an isolated case, including the antenna.
I am fully satisfied, thank you banggood!
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