This is what we will achieve when one Sonoff Basic it is:

Necessary equipment:

A Sonoff Basic (an R2 for this tutorial but the principle is the same with an R1 or an R3)

Step 1: Unscrew one of the fuse's pates

Step 2: Cut the track (yellow circle) and drill a hole for the fuse (purple circle)

Step 3: Unleash the small black cable circled with blue

Step 4: Solve the fuse in the previously drilled hole

in step 2 small purple circle.

(I advise to weld it by reversing the meaning, it is more convenient)

Step 5: Pass the small black cable with blue collar in the newly created hole and weld it on a terminal of the relay

It is also possible to drill a hole and pass this blue collar cable through it, it may be simpler:

It’s over, here’s a dry contact and thousands of possibilities

Other tutorials explain:

• How Flashing the Sonoffs, I did not do for the Sonoff Basic, there are many on the web
• After Flashing, connect a Sonoff to the WIFI network and link to Jeedom

The one photographed on this page is installed to trigger the centralised suction at home, just a pulse, as a bonus, here is the Jeedom config via EspEsay: