BLE GAT event question

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Hi all,


I am trying to develop BLE device based on SAM D51(WINC3400)

I need to send big data via BLE.

So I have several question below.


1. I am trying to send several frames. But I can't get any BLE GAT event from at_ble_event_get after sent at_ble_notification_send.

at_ble_characteristic_value_set - at_ble_notification_send - (wait BLE event to check the complete)...


2. atmel defined the max data size is below

#define MAX_BLE_DATA_SIZE    20

I am trying to increase it. But BLE doesn't work.


Anyone help please !!!