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Seems to be some discrepancy exists between these two statements:
I bought a shelly 2PM and it works great with a roller shutter.
and
I found the schema when i have a UP and DOWN cable to the engine but i d'on't find the solution when you have only one cable to the engine (behind my push button)
A roller shutter with ONE button only needs another Shelly actor as a Shelly plus 2PM. And it’s not sure that a proper solution exists with such a roller shutter motor.
At first, you should describe the device and its possibilities! After that, we could think about a solution.
i'd like open my garage doors.
From now i have a button in the garage.
If you press on it it goes DOWN ==> STOP ==> UP ==> STOP ==> ....
Behind this button i only have two cables (L + another one that goes to the engine)
I ned to keep this button but i'd like a shelly module to open it from my phone.
I hope you have enough detail to help me 
