I plan to setup sigfox system as per attached file.From the diagram it shows 3 units for target area which that each unit target area connected to #[B-l072z-lrwan1]​ to work as Sigfox communication.

If I want to assign a master/manager for sigfox module #B-l072z-lrwan1​  as seen on attached file,how it detect to that slave sigfox module #B-l072z-lrwan1​ ?Is that any guideline/manual instruction that you can provide?