NUS Max data size

Hello,

What is the max data size for NUS?

According to BLE data throughput in the S140 document, it looks like 247 but the data was sent successfully with  NRF_SDH_BLE_GATT_MAX_MTU_SIZE 435 by using NUS and if I set more than that, it caused crashes.

Can anyone clarify it if NUS MAX MTU size is bigger than BLE spec or my code just worked luckily but I am supposed to do that?

Thank you in advance.

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