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Sonoff 4ch pro R2 with Somfy Altus RTS

Hi all,

i must to use Sonoff with my awnings that use Somfy Altus RS (https://service.somfy.com/downloads/ch_v4/altus_a4.pdf). Now i can command it only from remote control. The engine have 3 wires blue, black and yellow. 

How can connect it on the Sonoff for command climb and descent on 2 different channels?

Thank you 

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