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How to increase MAX ATT_MTU size ?

Question asked by Rajarathinam Lawrence on Mar 14, 2018
Latest reply on Mar 17, 2018 by Neo Xiong

I am using FRDM KW40z dev.board and KW40Z_Connectivity_Software_1.0.1 software for our application development. Here I need increase ATT_MTU size as 512 byte instead of 23(gAttMaxMtu_c = 23) for application but  I changed gAttMaxMtu_c as 512 in ble_constants.h file and after connection application called GattClient_ExchangeMtu(peerDeviceId) function but still MTU exchanged with client RX MTU size is 23. 


Could you please explain how to increase the ATT_MTU maximum size to upload large data?