However, the situation is so that these xbees (max about 10) should autodetect (discover) and connect to a coordinator xbee
that is in broadcast mode.
And the problem is?
One of your XBees MUST be in broadcast mode, so that it can talk to all the other XBees. It's the MY address of that XBee that is the DL value of the other XBees. A will talk to B (and all the others); B will talk to A. A will talk to C (and all the others); C will talk to A. A will talk to D (and all the others); D will talk to A. And so on...