/corebluetooth runtime mtu#466
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CoreBluetooth's maximum write length is not reliably negotiated in the initial connection callback. Infer and publish the ATT MTU after service discovery, while resetting the exposed MTU to the default for each new connection. Rename the Rust integration test and its Android JNI/Kotlin entry points from "after connection" to "after service discovery". The shared helper discovers services before reading the MTU, so the old name overstated connect-only coverage; the JNI export and Kotlin declarations must match the renamed shared test.
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I'd like to be able to size payloads to the mtu and while the MTU branch added support the value was always 23 as apparently corebluetooth isn't updating the mtu property until after service discovery.