How to initiate mtu length update on CC2640R2F

flashtt

How to initiate mtu length update on CC2640R2F [Copy link]

Recently, I have been working on the communication between CC2640R2F and Android phones. Because the project requires a large throughput, it is necessary to send the 251-byte mtu supported by the Bluetooth 4.2/5.0 protocol, but the Android end is unable to receive it. When tested on iOS, iPhone6 cannot, but iPhoneX can. The reason is that iPhoneX will actively initiate an mtu length update. After CC2640R2F receives it, it can communicate with a 251-byte mtu length. The captured packets are as follows: But Android doesn't. I'm using OnePlus 6, Android 8.1, which supports Bluetooth 5. There is a requestMtu function in Android, but it's unsuccessful in my personal experiments or when I looked at other people's online. So now there's only one way left, which is for CC2640R2F to actively initiate an MTU length update. I checked the relevant documents and added the following code. But the corresponding packet was not captured during packet capture, which means it was unsuccessful. So how can CC2640R2F initiate an MTU update, even though the Android end may not accept it?

flashtt

I just got the correct answer on the TI forum. The mtu length update can only be initiated by the client. If the Android side does not actively initiate it, it will not work if the corresponding API cannot be implemented.

懒猫爱飞

You need to actively initiate a parameter update request

灞波儿奔

The Android side did not initiate this initiative, right?