ble_gap_event::::conn_update_req field
Represents a peer's request to update the connection parameters. This event is generated when a peer performs any of the following procedures: o L2CAP Connection Parameter Update Procedure o Link-Layer Connection Parameters Request Procedure To reject the request, return a non-zero HCI error code. The value returned is the reject reason given to the controller. Valid for the following event types: o BLE_GAP_EVENT_L2CAP_UPDATE_REQ o BLE_GAP_EVENT_CONN_UPDATE_REQ