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Android 13 Limit max MTU to 515 #744

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phatpaul opened this issue Nov 18, 2022 · 0 comments

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phatpaul commented Nov 18, 2022

From: dariuszseweryn/RxAndroidBle#808

since Android 13 the real maximal supported MTU by Android is 515.

Even though in Android source code the GATT_MAX_MTU_SIZE is still set to 517, the data buffer size GAT_MAX_ATTR_LEN is now capped at 512 bytes.

It leads to the situation when Android allows you to negotiate MTU 517, but it drops all the packets with data larger then 512 bytes

Here is the commit where google engineers did this amazing change

This broke my app. I suggest to cap the MTU request to 515, not 517. (or at least add a note to the readme)

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