目前我正在做一个项目，该项目需要从和读取Huawei Watch GT-DEE一些传感器。这里的服务端和客户端分别是华为手表和树莓派。但是，我得到的这篇文章非常接近我的目标。我一直在寻找更多细节，并得到了这篇文章和这篇文章。无论如何，我得到以下 BLE服务：gatttoolPythonRaspberry Pi 4primary
[aa:bb:cc:dd:ee:ff][LE]> primary
attr handle: 0x0001, end grp handle: 0x0009 uuid: 00001800-0000-1000-8000-00805f9b34fb
attr handle: 0x000a, end grp handle: 0x000d uuid: 00001801-0000-1000-8000-00805f9b34fb
attr handle: 0x0010, end grp handle: 0x0020 uuid: 0000180a-0000-1000-8000-00805f9b34fb
attr handle: 0x002a, end grp handle: 0x0034 uuid: 0000fe86-0000-1000-8000-00805f9b34fb
attr handle: 0x0100, end grp handle: 0x0112 uuid: 00001812-0000-1000-8000-00805f9b34fb
attr handle: 0x0300, end grp handle: 0xffff uuid: 00003802-0000-1000-8000-00805f9b34fb
并获得以下特征：
[aa:bb:cc:dd:ee:ff][LE]> characteristics
handle: 0x0002, char properties: 0x02, char value handle: 0x0003, uuid: 00002a00-0000-1000-8000-00805f9b34fb
handle: 0x0004, char properties: 0x02, char value handle: 0x0005, uuid: 00002a01-0000-1000-8000-00805f9b34fb
handle: 0x0006, char properties: 0x02, char value handle: 0x0007, uuid: 00002aa6-0000-1000-8000-00805f9b34fb
handle: 0x0008, char properties: 0x02, char value handle: 0x0009, uuid: 00002ac9-0000-1000-8000-00805f9b34fb
handle: 0x000b, char properties: 0x20, char value handle: 0x000c, uuid: 00002a05-0000-1000-8000-00805f9b34fb
handle: 0x0011, char properties: 0x02, char value handle: 0x0012, uuid: 00002a29-0000-1000-8000-00805f9b34fb
handle: 0x0013, char properties: 0x02, char value handle: 0x0014, uuid: 00002a23-0000-1000-8000-00805f9b34fb
handle: 0x0015, char properties: 0x02, char value handle: 0x0016, uuid: 00002a24-0000-1000-8000-00805f9b34fb
handle: 0x0017, char properties: 0x02, char value handle: 0x0018, uuid: 00002a25-0000-1000-8000-00805f9b34fb
handle: 0x0019, char properties: 0x02, char value handle: 0x001a, uuid: 00002a26-0000-1000-8000-00805f9b34fb
handle: 0x001b, char properties: 0x02, char value handle: 0x001c, uuid: 00002a27-0000-1000-8000-00805f9b34fb
handle: 0x001d, char properties: 0x02, char value handle: 0x001e, uuid: 00002a28-0000-1000-8000-00805f9b34fb
handle: 0x001f, char properties: 0x02, char value handle: 0x0020, uuid: 00002a2a-0000-1000-8000-00805f9b34fb
handle: 0x002b, char properties: 0x0c, char value handle: 0x002c, uuid: 0000fe01-0000-1000-8000-00805f9b34fb
handle: 0x002d, char properties: 0x10, char value handle: 0x002e, uuid: 0000fe02-0000-1000-8000-00805f9b34fb
handle: 0x0030, char properties: 0x0c, char value handle: 0x0031, uuid: 0000fe03-0000-1000-8000-00805f9b34fb
handle: 0x0032, char properties: 0x10, char value handle: 0x0033, uuid: 0000fe04-0000-1000-8000-00805f9b34fb
handle: 0x0101, char properties: 0x02, char value handle: 0x0102, uuid: 00002a4a-0000-1000-8000-00805f9b34fb
handle: 0x0103, char properties: 0x02, char value handle: 0x0104, uuid: 00002a4b-0000-1000-8000-00805f9b34fb
handle: 0x0106, char properties: 0x04, char value handle: 0x0107, uuid: 00002a4c-0000-1000-8000-00805f9b34fb
handle: 0x0108, char properties: 0x12, char value handle: 0x0109, uuid: 00002a22-0000-1000-8000-00805f9b34fb
handle: 0x010b, char properties: 0x0e, char value handle: 0x010c, uuid: 00002a32-0000-1000-8000-00805f9b34fb
handle: 0x010d, char properties: 0x12, char value handle: 0x010e, uuid: 00002a4d-0000-1000-8000-00805f9b34fb
handle: 0x0111, char properties: 0x06, char value handle: 0x0112, uuid: 00002a4e-0000-1000-8000-00805f9b34fb
handle: 0x0301, char properties: 0x1e, char value handle: 0x0302, uuid: 00004a02-0000-1000-8000-00805f9b34fb
根据这篇文章，2a00 服务（uuid：0000 2a00 -0000-1000-8000-00805f9b34fb，char 值句柄为 0x0003）指的是设备名称（主要为 1800），我得到正确如下：
[aa:bb:cc:dd:ee:ff][LE]> char-read-hnd 0x0003
Characteristic value/descriptor: 48 55 41 57 45 49 20 57 41 54 43 48 20 47 54 2d 44 45 45
但是，我正在寻找由（或主要）输出部分中2a37缺少的服务定义的 BMP 值。根据规格（请查看传感器部分），它具有. 无论如何，我可以在手表屏幕和手机的健康应用程序中看到心率。characteristics180dOptical heart rate sensor
问题：
为什么gatttool不在2a37特征或180d主要部分显示服务？