Thanks in advanced. Platform is nrf52832, SDK_17.0.2, use nrf connect app. I create custom service. If I set 128bit base uuid: {0x9E, 0xCA, 0xDC, 0x24, 0x0E, 0xE5, 0xA9, 0xE0, 0x93, 0xF3, 0xA3, 0xB5, 0x00, 0x00, 0x40, 0x6E}, the service name shows Nordic UART Service; If I set {0xAD, 0xE8, 0xF3, 0xD4, 0xB8, 0x84, 0x94, 0xA0, 0xAA, 0xF5, 0xE2, 0x0F, 0x00, 0x00, 0x5A, 0x95}, shows service name Beacon Config. So I think it must be a mapping list exist, as well as charateristic mapping of uuid and name. Would anyone send me?