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@Jean-Philippe_Rey
Actually I misunderstood the behavior of the BLE stack.
sd_ble_gattc_hv_confirmis to be called on client side to send an application level acknowledge of an incoming "indication" packet.Server side, however, the BLE stack will emit an
BLE_GATTS_EVT_HVCevent upon reception of such an application level acklowledge sent by the peer. While this mecanism seems to be used in some specific BLE services, it seems that thisBLE_GATTS_EVT_HVCevent is not available for a custom BLE service. Do anyone know how and where should I try to add this event in such a way for the server application to be able to react on it?