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connection interval set/ reset during OAD

Hi All,

I have verified OAD happens successfully only when Connection interval parameter is set to 20ms.

and I also assume only Slave(Keyfob) can change/set connection Interval Parameter and not the master(IOS Device).

Now what I am trying to do is,I want to change connection interval parameter to 20ms only when OAD starts..like When the IOS App/Master Device sends its image header to 0xFFC1 characteristic,  the firmware on keyfob should set the connection interval to 20ms at that point.Firmware should also reset it back to original when the transfer is complete.

How to make this scenario work? what would be the sequence of actions?

Regards,

Sarang K.