SerivceId就是Service UUID。
蓝牙设备的ID，通过此ID可以进行连接蓝牙设备，连接成功之后可以获取serviceId，serviceId可以有多个，每个serviceId可以看作是服务，每个serviceId中可以定义多个uuid（特征值）。
Service UUID已经有了很多特定的，也可以自己定义。
特定的：{0000xxxx-0000-1000-8000-00805F9B34FB}
xxxx = 0x0000 ~ 0xFFFE
GATT Service 0x1800 Generic Access
GATT Service 0x1801 Generic Attribute
GATT Service 0x1802 Immediate Alert
GATT Service 0x1803 Link Loss
GATT Service 0x1804 Tx Power
GATT Service 0x1805 Current Time
GATT Service 0x1806 Reference Time Update
GATT Service 0x1807 Next DST Change
GATT Service 0x1808 Glucose
GATT Service 0x1809 Health Thermometer
GATT Service 0x180A Device Information
GATT Service 0x180D Heart Rate
GATT Service 0x180E Phone Alert Status
GATT Service 0x180F Battery
GATT Service 0x1810 Blood Pressure
GATT Service 0x1811 Alert Notification
GATT Service 0x1812 Human Interface Device
GATT Service 0x1813 Scan Parameters
GATT Service 0x1814 Running Speed and Cadence
GATT Service 0x1815 Automation IO
GATT Service 0x1816 Cycling Speed and Cadence
GATT Service 0x1818 Cycling Power
GATT Service 0x1819 Location and Navigation
GATT Service 0x181A Environmental Sensing
GATT Service 0x181B Body Composition
GATT Service 0x181C User Data
GATT Service 0x181D Weight Scale
GATT Service 0x181E Bond Management
GATT Service 0x181F Continuous Glucose Monitoring
GATT Service 0x1820 Internet Protocol Support
GATT Service 0x1821 Indoor Positioning
GATT Service 0x1822 Pulse Oximeter
GATT Service 0x1823 HTTP Proxy
GATT Service 0x1824 Transport Discovery
GATT Service 0x1825 Object Transfer
GATT Service 0x1826 Fitness Machine
GATT Service 0x1827 Mesh Provisioning
GATT Service 0x1828 Mesh Proxy
GATT Service 0x1829 Reconnection Configuration
GATT Service 0x183A Insulin Delivery
GATT Service 0x183B Binary Sensor
GATT Service 0x183C Emergency Configuration
GATT Service 0x183E Physical Activity Monitor
GATT Service 0x1843 Audio Input Control
GATT Service 0x1844 Volume Control