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Relationship between MTU and characteristic size

takashina hiroki

SDK: 15.3.0
SoftDevice: S132
Device: EYSHJNZWZ (nRF52832)

Is it possible to "WRITE" a characteristic that is larger than the MTU?
As an example, we are considering the following settings.

MTU size : 23Byte
Characteristic size : 160Byte

Will the data be divided into multiple "WRITE"?
In the above example, we think it will be divided into 8 times ( = 160 / (23-3)).

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  • +1

    Hi

    Indeed, the MTU size can be negotiated and increased if both peripheral and central supports larger MTU sizes, but you can also split up a write into multiple instances if communicating with devices only supporting older BLE versions. If so it would indeed be split up into chunks of 23 bytes.

    Best regards,

    Simon

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  • +1

    Hi

    Indeed, the MTU size can be negotiated and increased if both peripheral and central supports larger MTU sizes, but you can also split up a write into multiple instances if communicating with devices only supporting older BLE versions. If so it would indeed be split up into chunks of 23 bytes.

    Best regards,

    Simon

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