Ah; So, you want to know if you set the directAddr, and then start directed advertising from your peripheral to the IOS whether the peripheral will still be reaching the IOS, or if it will need to reacquire the address from the IOS device?
I don't know the answer to that question unfortunately. But, I would suspsect that the IOS changing its address would no longer receive the directed advertisement packets (as it has changed it's address that it responds to).
