Hello: In order to take full advantage of Data Length Extension the user should set the following syscfg values to 251.
BLE_LL_MAX_PKT_SIZE BLE_LL_CONN_INIT_MAX_TX_BYTES Both of these values should be set to 251 in order for both transmitted and received PDU’s to possibly be as large as 251 bytes. If only the LL_MAX_PKT_SIZE is 251, received PDU’s can be as large as 251 but transmitted PDU’s will only be as large as CONN_INIT_MAX_TX_BYTES. Of course, the host can always change things by using the LE_Set_Data_Length command. Enjoy
