Connect 2 Sodaq Sara R410M between them


Does anyone knows if its possible to connect 2 Sodaq sara R410M ?
I have 2 boards that are connected in the same antenna. Can i send messages between them directly or through the antenna or through the Vodafone M2M platform?
So can i send messages between them in these 3 occassions :
1. SodaqSara1 -> SodaqSara2
2. SodaqSara1 ->Antenna -> SodaqSara2
3. SodaqSara1 ->Antenna ->Vodafone M2M platform ->SodaqSara2
If yes do you know how?