Hi @fbt, The packets transferred per connection event is not determined by the connection parameter. The connection parameter only maintain the connection interval and connection timeout. What I can tell is that, the parameters, also known as PPCP on peripheral side, will apply only if the central side accept these parameters when peripheral initiates the request. While if the central initiate the parameter update sequence, it should pass in the connection parameters as you have already done. The packets transferred per connection is a very under layer stuff, so it is out of my research.