Yes Erel, I realize it, after 2 days of various tries. The nearest approach for me was with BlueStacks, but finally either it worked because BlueStacks (and so B4A Bridge) are referring the public IP -not the local one.
Apart this, is notable the speed of some emulators (I had no previous experience, except with the Android AVD -which is really slow).Seems that HAXM support is not so catalytic.
I will try a solution "Androidizing" a Rasberry Pi... just for fun.