masterSlaveDetermination procedure

[henri.maenpaa at NOKIA.COM]

Hi,

I've understood masterSlaveDetermination procedure goes as follows:
1. EP1 sends mSD message with a value specific to it and also the random
number.
2. EP2 sends back an mSDAck with slave/master info (after comparing its own
and EP1's related info).
3. EP1 yet sends mSDAck to EP2 with slave/master info.

Question: Could someone try to explain the reasoning behind the "third
message", that is, what is it needed for?

Thank you,

Henri Mäenpää
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