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how to discovery 128bit characteristic UUID which is totally different form 128bit service UUID

Hi, I am trying to make nrf52832 as a UART certal. The service UUID and characteristic UUID of peripheral are shown as the following picture. They are all 128bit and quite different. In the example of "ble_app_uart_c", the BLE_UUID_NUS_SERVICE, BLE_UUID_NUS_TX_CHARACTERISTIC, and BLE_UUID_NUS_RX_CHARACTERISTIC are all 16bit. throught this example, I can get service UUID but can not get characteristic UUID. the version of SDK is 12.1.  How can i get the characteristic UUID? Could anyone help me or give me some suggestion?  thanks.

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