app连接蓝牙设备，对其进行OTA升级时，对于不同的android系统有不同的反应

[inusida]

针对android 11和Android 13 设置MTU为150时，会显示设置错误还有“GATT INVALID PDU”
针对android 15的手机设置MTU为150时，显示设置成功并且返回mtu 设置为251，有人知道为啥吗？

[philips77]

From Android 14+ the MTU value given in requestMtu(...) is ignored and Android is always requesting 517: https://developer.android.com/about/versions/14/behavior-changes-all#mtu-set-to-517

I recommend requesting 517 on older Android versions as well to keep the behavior consistent.

I don't know why would you get INVALID PDU error...

[inusida]

Thank you for your answer