concurrent characteristic write and notify

Question

Hi, 
 I was just wondering what the sequence of events would be in the following scenario: 
 A S110 peripheral device (GATT server) has a characteristic with write access and notifications enabled (by the GATT client). The GATT client performs a write to the charteristic at the same time as the GATT server issues a notification (changing it to different value). 
 What would happen in the first connection interval following these events?

Hung Bui · Accepted Answer

Hi Ned,
From what you described, in the first connection interval following the events, we will have 2 packets. First is the packet from central to peripheral which contains the write command. Right after this packet, in same connection interval, is the packet from peripheral to central with the notification .
Note that the value in the notification is the old value, not the new one comes with write command.