Thank you greenja for your reply,
what is interesting is the chip CC2540 and especially its link layer (baseband) ...
For example, if I have my BLE proprietary stack+profiles working with a chip "TOTO" which not works on multi-nodes (one master connected to 3 slaves), and I want my stack+profiles running in multi-nodes network, I can not do this with my chip "TOTO", but if I plug my stack+profile on CC2540, I will use the baseband and can make a multi-nodes network ... even if the TI stack run also
