Meross MSS425 Power Strip
Meross MSS425

Available from:

GPIO #Component
GPIO00 Relay5i
GPIO01 None
GPIO02 None
GPIO03 None
GPIO04 Led1i
GPIO05 None
GPIO09 None
GPIO10 None
GPIO12 Relay1
GPIO13 Button1
GPIO14 Relay2
GPIO15 Relay3
GPIO16 Relay4i
Configuration (old format, will be converted to new template when applied)
{"NAME":"Meross MSS425","GPIO":[33,0,0,0,56,0,0,0,21,17,22,23,32],"FLAG":0,"BASE":18}

To open, 4 screws are under the soft foot pads. They take a size 2.0 triangle bit; make sure you have a large collection of small screwdriver bits around.

meross guts picture

The programming header is directly on the Tuya module and is silkscreened with the labels for the pins. Solder onto those and program just like any other Tuya. There’s unfortunately no button to get into firmware mode that I could find, so you have to ground the pin yourself. If you’re using an external power source for the board and another power source for your TXD/RXD, make sure to tie the grounds together or else it won’t talk. I burned on the generic tasmota release and set it up like so:

Relays 1-3 are the AC plugs Relays 4,5 are the USBs The button only turns off the first AC by default, but you could write rules to do whatever you want.

tasmota config