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我是用simple_central例程来连接simple_peripheral，连接之后我想修改MTU，但是发现没有合适的API。我试图在simple_central中使用GATT_UpdateMTU来修改当前连接的MTU，但是均不能成功。请问应该如何使用API来修改MTU的大小？谢谢~
若只想更改MTU size则可以直接在sysconfig->General ConfigurationConfigure General BLE Settings 修改PDU size
连接后修改参考：https://dev.ti.com/tirex/content/simplelink_cc13x2_26x2_sdk_5_20_00_52/docs/ble5stack/ble_user_guide/html/ble-stack-5.x/gatt.html#maximum-transmission-unit-mtu
