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PDU Size 不能更改，只能通过选择不同的版本去更换。
//source\ti\ble5stack\icall\inc\ble_user_config.h MAX_PDU_SIZE Line 214
// Maximum size in bytes of the BLE HCI PDU. Valid range: 27 to 255
// The maximum ATT_MTU is MAX_PDU_SIZE - 4.
#ifndef MAX_PDU_SIZE
#if defined(BLE_V42_FEATURES) && (BLE_V42_FEATURES & SECURE_CONNS_CFG)
#define MAX_PDU_SIZE 255
#else
#define MAX_PDU_SIZE 27
#endif //(BLE_V42_FEATURES & SECURE_CONNS_CFG)
#endif
我刚才去看了一下眼小米6是支持Bluetooth5的你可以在你的初始化中加入下面的代码试一下，其他先不要更改。
//Set default values for Data Length Extension
//Extended Data Length Feature is already enabled by default
//in build_config.opt in stack project.
{
//Set initial values to maximum, RX is set to max. by default(251 octets, 2120us)
#define APP_SUGGESTED_PDU_SIZE 251 //default is 27 octets(TX)
#define APP_SUGGESTED_TX_TIME 2120 //default is 328us(TX)
//This API is documented in hci.h
//See the LE Data Length Extension section in the BLE5-Stack User's Guide for information on using this command:
//software-dl.ti.com/.../
HCI_LE_WriteSuggestedDefaultDataLenCmd(APP_SUGGESTED_PDU_SIZE, APP_SUGGESTED_TX_TIME);
}
