sd_ble_gatts_hvx() send more than 20 bytes per notify packet.

[Tim_lai]

SDK version: nRF5_SDK_15.3.0

Platform: nRF52840 DK

SoftDevice: s140

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Hi all,

I use ble_app_blinky example and Android nRF Blinky SDK(https://github.com/NordicSemiconductor/Android-nRF-Blinky) to add function.

Recently I want to modify the button characteristic of ble_app_blinky example to send 32 bytes notification packet.

so I fix example code as below:

modify that init_len and max_len are 32 of the button characteristic in ble_lbs_init().

add the string(32 bytes) in sd_ble_gatts_hvx()

Android APP side, try to print the log of notification packet in BlinkyButtonDataCallback.

only get 20 bytes:

 Is it possible to send more than 20 bytes per notification packet using sd_ble_gatts_hvx()?

Thanks.

[RK]

With the default MTU .. no. Please check other threads about negotiating a larger MTU and still assume that you won't be able to do it and will need to break your data into multiple packets.