nrf52832 学习笔记蓝牙协议层级理解
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nrf52832 学习笔记（七）蓝牙协议层级理解
本文主要由一下几篇文档摘录汇总而成 ，如有错误欢迎斧正
蓝牙协议，一定要明白蓝牙协议是蓝牙通信的协议，通信协议就是定义通信数据结构和字段含义的一个规定，LL、L2CAP、ATT、GATT、GAP等都是通信协议。
单模BLE设备分为三个模块：控制器(Controller)、主机(Host)和应用程序(Application)。
控制器(Controller)
PHY(物理层)
PHY层用来指定BLE所用的无线频段，调制解调方式和方法等。PHY层做得好不好，直接决定整个BLE芯片的功耗，灵敏度以及selectivity等射频指标。
LL(链路层)
LL层是整个BLE协议栈的核心，也是BLE协议栈的难点和重点。LL提供的功能通常包括：前导码，访问地址和空中协议框架，CRC生成和验证，数据白化，随机数生成和AES加密，并且控制射频模块状态（ 待机、广播、扫描、正在启动或已连接 五选一），定义四种角色（广播设备、扫描设备、主设备、从设备）
像Nordic的BLE协议栈能同时支持20个link（连接），就是LL层的功劳。LL层要做的事情非常多，比如具体选择哪个射频通道进行通信，怎么识别空中数据包，具体在哪个时间点把数据包发送出去，怎么保证数据的完整性，ACK如何接收，如何进行重传，以及如何对链路进行管理和控制等等。LL层只负责把数据发出去或者收回来，对数据进行怎样的解析则交给上面的GAP或者GATT。
HCI( 主机控制器接口)
协议栈有三种架构，只有 host+controller双芯片标准架构才有HCI层
host+controller双芯片标准架构
蓝牙的Host 和 Controller 分别在不同的芯片上运行，Host 和 Controller就需要一种标准化的接口进行通信，这个接口就是HCI
单芯片整体方案
host和controller都放在同一颗芯片上，由于host和controller都在同一颗芯片上，因此物理HCI就没有存在的必要性，host和controller之间直接通过API来交互。像Nordic的蓝牙协议栈Softdevice，就是采用这种模式。
自定义双芯片架构
和 host+controller双芯片标准架构 类似，只是Host 和 Controller 之间通信使用的是自定义协议
主机(Host)
L2CAP
对ATT层和SM层来的数据进行分包重组形成标准的BLE数据包发送给LL层， 反之接收LL层数据包重组传输到上层，并且还要对连接间隔进行管理。
ATT
ATT，全称attribute protocol（数据交互协议）。BLE采用了client/server (C/S) 架构来进行数据交互，一般而言从机提供服务，因此从机是server，手机使用从机提供的服务，因此手机是client。比如蓝牙体温计，它可以提供 “体温” 数据服务，因此是一个server，而手机则可以请求“体温”数据以显示在手机上，因此手机是一个client。
注意这里的server端和client端和主从机没有对应关系，主机可以是 ATT server端或 ATT client端，而从机也可以是 ATT server端或 ATT client端。从机也可以同时成为 ATT server端和 ATT client端。
服务是以数据为载体的，所以说server端提供服务其实就是提供各种有价值的数据。客户端要访问某一个数据，就发送一个request/请求（其实就是一条命令或者PDU），服务端再把该数据返回给客户端（一条response/响应命令或者PDU）,这个request 和 response 命令也叫做ATT命令，而ATT则由一系列ATT命令组成。
request 和 response有很多种:
常用的包括4类：读，写，notify（通知）和indicate（指示）。这些命令又可以分成两种：
- 如果它需要response，那么会在相应命令后面加上request；
- 如果它只需要ACK而不需要response，那么它的后面就不会带request。
这里要特别强调一点，ATT所有命令都是“必达”的，也就是说每个命令发出去之后，会立马等ACK信息，如果收到了ACK包，发送方认为命令完成；否则发送方会一直重传该命令直到超时导致BLE连接断开。换句话说，只要你的BLE连接没有断开，那么你之前发送的数据包，不管它是用什么ATT PDU来发送的，它肯定被对方收到了。
估计很多人对此会产生疑问，因为大家经常碰到丢包的情况，其实碰到的“丢包”，不是空中把包丢了或者包在空中被干扰了，而是大家发送的代码写得有问题，导致要发送的包没有被安全送达到协议栈射频FIFO中，从而出现所谓的“丢包”。以后大家碰到丢包情况，请先检查代码，保证数据包正确完整安全地送达到协议栈射频FIFO中，只要数据包放到了协议栈射频FIFO中，蓝牙协议栈就能保证该数据包“必达”对方。
既然每个ATT命令都必达对方，那么还需要request类型的命令做什么？
如果一个命令带有request后缀，那么发起方就可以收到命令的response包，这个response包在应用层是有回调事件的，而前述的ACK包在应用层是没有回调事件的。换句话说，不带request的命令，虽然协议栈底层确保了该命令必达对方，但应用层其实并不知道（私有实现方法除外），当你需要实现一个通信序列的时候，这种命令就显得不足了。而采用request/response方式的命令对，request命令发出去之后，必须等到相应的response命令回复才能进行下一步操作，比如发送下一个request命令，这样应用层可以严格按照规定逻辑执行一系列的操作，这个在很多应用场合是非常有用的。
Request/response命令对还有一个副作用：大大降低通信的有效速率（吞吐率），因为request/response命令必须在不同的连接间隔中出现，也就是说，你在间隔1中发送了一个request命令，那么response包必须在间隔2或者稍后间隔中回复，而不能在间隔1中回复，这就导一个数据包的发送需要跨两个连接间隔甚至更多。而不带request后缀的ATT命令就没有这个限制，ACK可以在同一个连接间隔中回复，这样一个连接间隔中可以同时发出多个数据包，这样将大大提高通信速率。大家可以参考下图来理解request和非request命令的区别：
注：第1个连接间隔中的蓝色包为request命令，旁边的灰色包是该request的ACK；第2个连接间隔的绿色包是response包，而它的ACK是第3个连接间隔中的蓝色包
注：图中的绿色包就是非request命令，而紧随其后的灰色包就是它的ACK
attribute
ATT，全称attribute protocol（数据交互协议），也就是操作 attribute 的协议。那么attribute 是什么？
蓝牙 server 中的数据都是以 attribute 为单位存储的，attribute 包含一下四部分：
- Attribute Handle
Attribute句柄，16-bit长度。Client端要访问Server端的Attribute，都是通过这个句柄来访问的，也就是说ATT PDU一般都包含handle的值。用户在软件代码添加characteristic的时候，系统会自动按顺序地为相关attribute生成句柄。Attribute Handle 相当于一个序号，可以方便查找Attribute 并且可以区分相同Attribute Type 的 Attribute
- Attribute Type
Attribute类型，2字节或者16字节长,也就是常说的蓝牙UUID。SIG小组用UUID和世间万物（目前只定义了一小部分）做了一个对照表，将UUID和事物联系起来。例如 心率计 的UUID是 0x180D
- Attribute Value
数据真正的值，0到512字节长。
- Attribute Permissions
权限属性
Attribute Type 已定义的UUID
/** @defgroup BLE_UUID_VALUES Assigned Values for BLE UUIDs
* @ */
/* Generic UUIDs, applicable to all services */
#define BLE_UUID_UNKNOWN 0x0000 /**< Reserved UUID. */
#define BLE_UUID_SERVICE_PRIMARY 0x2800 /**< Primary Service. */
#define BLE_UUID_SERVICE_SECONDARY 0x2801 /**< Secondary Service. */
#define BLE_UUID_SERVICE_INCLUDE 0x2802 /**< Include. */
#define BLE_UUID_CHARACTERISTIC 0x2803 /**< Characteristic. */
#define BLE_UUID_DESCRIPTOR_CHAR_EXT_PROP 0x2900 /**< Characteristic Extended Properties Descriptor. */
#define BLE_UUID_DESCRIPTOR_CHAR_USER_DESC 0x2901 /**< Characteristic User Description Descriptor. */
#define BLE_UUID_DESCRIPTOR_CLIENT_CHAR_CONFIG 0x2902 /**< Client Characteristic Configuration Descriptor. */
#define BLE_UUID_DESCRIPTOR_SERVER_CHAR_CONFIG 0x2903 /**< Server Characteristic Configuration Descriptor. */
#define BLE_UUID_DESCRIPTOR_CHAR_PRESENTATION_FORMAT 0x2904 /**< Characteristic Presentation Format Descriptor. */
#define BLE_UUID_DESCRIPTOR_CHAR_AGGREGATE_FORMAT 0x2905 /**< Characteristic Aggregate Format Descriptor. */
/* GATT specific UUIDs */
#define BLE_UUID_GATT 0x1801 /**< Generic Attribute Profile. */
#define BLE_UUID_GATT_CHARACTERISTIC_SERVICE_CHANGED 0x2A05 /**< Service Changed Characteristic. */
/* GAP specific UUIDs */
#define BLE_UUID_GAP 0x1800 /**< Generic Access Profile. */
#define BLE_UUID_GAP_CHARACTERISTIC_DEVICE_NAME 0x2A00 /**< Device Name Characteristic. */
#define BLE_UUID_GAP_CHARACTERISTIC_APPEARANCE 0x2A01 /**< Appearance Characteristic. */
#define BLE_UUID_GAP_CHARACTERISTIC_RECONN_ADDR 0x2A03 /**< Reconnection Address Characteristic. */
#define BLE_UUID_GAP_CHARACTERISTIC_PPCP 0x2A04 /**< Peripheral Preferred Connection Parameters Characteristic. */
#define BLE_UUID_GAP_CHARACTERISTIC_CAR 0x2AA6 /**< Central Address Resolution Characteristic. */
#define BLE_UUID_GAP_CHARACTERISTIC_RPA_ONLY 0x2AC9 /**< Resolvable Private Address Only Characteristic. */
/** @ */
/** @defgroup UUID_SERVICES Service UUID definitions
* @ */
#define BLE_UUID_ALERT_NOTIFICATION_SERVICE 0x1811 /**< Alert Notification service UUID. */
#define BLE_UUID_BATTERY_SERVICE 0x180F /**< Battery service UUID. */
#define BLE_UUID_BLOOD_PRESSURE_SERVICE 0x1810 /**< Blood Pressure service UUID. */
#define BLE_UUID_CURRENT_TIME_SERVICE 0x1805 /**< Current Time service UUID. */
#define BLE_UUID_CYCLING_SPEED_AND_CADENCE 0x1816 /**< Cycling Speed and Cadence service UUID. */
#define BLE_UUID_LOCATION_AND_NAVIGATION_SERVICE 0x1819 /**< Location and Navigation service UUID. */
#define BLE_UUID_DEVICE_INFORMATION_SERVICE 0x180A /**< Device Information service UUID. */
#define BLE_UUID_GLUCOSE_SERVICE 0x1808 /**< Glucose service UUID. */
#define BLE_UUID_HEALTH_THERMOMETER_SERVICE 0x1809 /**< Health Thermometer service UUID. */
#define BLE_UUID_HEART_RATE_SERVICE 0x180D /**< Heart Rate service UUID. */
#define BLE_UUID_HUMAN_INTERFACE_DEVICE_SERVICE 0x1812 /**< Human Interface Device service UUID. */
#define BLE_UUID_IMMEDIATE_ALERT_SERVICE 0x1802 /**< Immediate Alert service UUID. */
#define BLE_UUID_LINK_LOSS_SERVICE 0x1803 /**< Link Loss service UUID. */
#define BLE_UUID_NEXT_DST_CHANGE_SERVICE 0x1807 /**< Next Dst Change service UUID. */
#define BLE_UUID_PHONE_ALERT_STATUS_SERVICE 0x180E /**< Phone Alert Status service UUID. */
#define BLE_UUID_REFERENCE_TIME_UPDATE_SERVICE 0x1806 /**< Reference Time Update service UUID. */
#define BLE_UUID_RUNNING_SPEED_AND_CADENCE 0x1814 /**< Running Speed and Cadence service UUID. */
#define BLE_UUID_SCAN_PARAMETERS_SERVICE 0x1813 /**< Scan Parameters service UUID. */
#define BLE_UUID_TX_POWER_SERVICE 0x1804 /**< TX Power service UUID. */
#define BLE_UUID_IPSP_SERVICE 0x1820 /**< Internet Protocol Support service UUID. */
#define BLE_UUID_BMS_SERVICE 0x181E /**< BOND MANAGEMENT service UUID*/
#define BLE_UUID_CGM_SERVICE 0x181F /**< Continuous Glucose Monitoring service UUID*/
#define BLE_UUID_PLX_SERVICE 0x1822 /**< Pulse Oximeter Service UUID*/
#define BLE_UUID_OTS_SERVICE 0x1825 /**< Object Transfer Service UUID*/
/** @ */
/** @defgroup UUID_CHARACTERISTICS Characteristic UUID definitions
* @ */
#define BLE_UUID_REMOVABLE_CHAR 0x2A3A /**< Removable characteristic UUID. */
#define BLE_UUID_SERVICE_REQUIRED_CHAR 0x2A3B /**< Service Required characteristic UUID. */
#define BLE_UUID_ALERT_CATEGORY_ID_CHAR 0x2A43 /**< Alert Category Id characteristic UUID. */
#define BLE_UUID_ALERT_CATEGORY_ID_BIT_MASK_CHAR 0x2A42 /**< Alert Category Id Bit Mask characteristic UUID. */
#define BLE_UUID_ALERT_LEVEL_CHAR 0x2A06 /**< Alert Level characteristic UUID. */
#define BLE_UUID_ALERT_NOTIFICATION_CONTROL_POINT_CHAR 0x2A44 /**< Alert Notification Control Point characteristic UUID. */
#define BLE_UUID_ALERT_STATUS_CHAR 0x2A3F /**< Alert Status characteristic UUID. */
#define BLE_UUID_BATTERY_LEVEL_CHAR 0x2A19 /**< Battery Level characteristic UUID. */
#define BLE_UUID_BLOOD_PRESSURE_FEATURE_CHAR 0x2A49 /**< Blood Pressure Feature characteristic UUID. */
#define BLE_UUID_BLOOD_PRESSURE_MEASUREMENT_CHAR 0x2A35 /**< Blood Pressure Measurement characteristic UUID. */
#define BLE_UUID_BODY_SENSOR_LOCATION_CHAR 0x2A38 /**< Body Sensor Location characteristic UUID. */
#define BLE_UUID_BOOT_KEYBOARD_INPUT_REPORT_CHAR 0x2A22 /**< Boot Keyboard Input Report characteristic UUID. */
#define BLE_UUID_BOOT_KEYBOARD_OUTPUT_REPORT_CHAR 0x2A32 /**< Boot Keyboard Output Report characteristic UUID. */
#define BLE_UUID_BOOT_MOUSE_INPUT_REPORT_CHAR 0x2A33 /**< Boot Mouse Input Report characteristic UUID. */
#define BLE_UUID_CURRENT_TIME_CHAR 0x2A2B /**< Current Time characteristic UUID. */
#define BLE_UUID_DATE_TIME_CHAR 0x2A08 /**< Date Time characteristic UUID. */
#define BLE_UUID_DAY_DATE_TIME_CHAR 0x2A0A /**< Day Date Time characteristic UUID. */
#define BLE_UUID_DAY_OF_WEEK_CHAR 0x2A09 /**< Day Of Week characteristic UUID. */
#define BLE_UUID_DST_OFFSET_CHAR 0x2A0D /**< Dst Offset characteristic UUID. */
#define BLE_UUID_EXACT_TIME_256_CHAR 0x2A0C /**< Exact Time 256 characteristic UUID. */
#define BLE_UUID_FIRMWARE_REVISION_STRING_CHAR 0x2A26 /**< Firmware Revision String characteristic UUID. */
#define BLE_UUID_GLUCOSE_FEATURE_CHAR 0x2A51 /**< Glucose Feature characteristic UUID. */
#define BLE_UUID_GLUCOSE_MEASUREMENT_CHAR 0x2A18 /**< Glucose Measurement characteristic UUID. */
#define BLE_UUID_GLUCOSE_MEASUREMENT_CONTEXT_CHAR 0x2A34 /**< Glucose Measurement Context characteristic UUID. */
#define BLE_UUID_HARDWARE_REVISION_STRING_CHAR 0x2A27 /**< Hardware Revision String characteristic UUID. */
#define BLE_UUID_HEART_RATE_CONTROL_POINT_CHAR 0x2A39 /**< Heart Rate Control Point characteristic UUID. */
#define BLE_UUID_HEART_RATE_MEASUREMENT_CHAR 0x2A37 /**< Heart Rate Measurement characteristic UUID. */
#define BLE_UUID_HID_CONTROL_POINT_CHAR 0x2A4C /**< Hid Control Point characteristic UUID. */
#define BLE_UUID_HID_INFORMATION_CHAR 0x2A4A /**< Hid Information characteristic UUID. */
#define BLE_UUID_IEEE_REGULATORY_CERTIFICATION_DATA_LIST_CHAR 0x2A2A /**< IEEE Regulatory Certification Data List characteristic UUID. */
#define BLE_UUID_INTERMEDIATE_CUFF_PRESSURE_CHAR 0x2A36 /**< Intermediate Cuff Pressure characteristic UUID. */
#define BLE_UUID_INTERMEDIATE_TEMPERATURE_CHAR 0x2A1E /**< Intermediate Temperature characteristic UUID. */
#define BLE_UUID_LOCAL_TIME_INFORMATION_CHAR 0x2A0F /**< Local Time Information characteristic UUID. */
#define BLE_UUID_MANUFACTURER_NAME_STRING_CHAR 0x2A29 /**< Manufacturer Name String characteristic UUID. */
#define BLE_UUID_MEASUREMENT_INTERVAL_CHAR 0x2A21 /**< Measurement Interval characteristic UUID. */
#define BLE_UUID_MODEL_NUMBER_STRING_CHAR 0x2A24 /**< Model Number String characteristic UUID. */
#define BLE_UUID_UNREAD_ALERT_CHAR 0x2A45 /**< Unread Alert characteristic UUID. */
#define BLE_UUID_NEW_ALERT_CHAR 0x2A46 /**< New Alert characteristic UUID. */
#define BLE_UUID_PNP_ID_CHAR 0x2A50 /**< PNP Id characteristic UUID. */
#define BLE_UUID_PROTOCOL_MODE_CHAR 0x2A4E /**< Protocol Mode characteristic UUID. */
#define BLE_UUID_RECORD_ACCESS_CONTROL_POINT_CHAR 0x2A52 /**< Record Access Control Point characteristic UUID. */
#define BLE_UUID_REFERENCE_TIME_INFORMATION_CHAR 0x2A14 /**< Reference Time Information characteristic UUID. */
#define BLE_UUID_REPORT_CHAR 0x2A4D /**< Report characteristic UUID. */
#define BLE_UUID_REPORT_MAP_CHAR 0x2A4B /**< Report Map characteristic UUID. */
#define BLE_UUID_RINGER_CONTROL_POINT_CHAR 0x2A40 /**< Ringer Control Point characteristic UUID. */
#define BLE_UUID_RINGER_SETTING_CHAR 0x2A41 /**< Ringer Setting characteristic UUID. */
#define BLE_UUID_SCAN_INTERVAL_WINDOW_CHAR 0x2A4F /**< Scan Interval Window characteristic UUID. */
#define BLE_UUID_SCAN_REFRESH_CHAR 0x2A31 /**< Scan Refresh characteristic UUID. */
#define BLE_UUID_SERIAL_NUMBER_STRING_CHAR 0x2A25 /**< Serial Number String characteristic UUID. */
#define BLE_UUID_SOFTWARE_REVISION_STRING_CHAR 0x2A28 /**< Software Revision String characteristic UUID. */
#define BLE_UUID_SUPPORTED_NEW_ALERT_CATEGORY_CHAR 0x2A47 /**< Supported New Alert Category characteristic UUID. */
#define BLE_UUID_SUPPORTED_UNREAD_ALERT_CATEGORY_CHAR 0x2A48 /**< Supported Unread Alert Category characteristic UUID. */
#define BLE_UUID_SYSTEM_ID_CHAR 0x2A23 /**< System Id characteristic UUID. */
#define BLE_UUID_TEMPERATURE_MEASUREMENT_CHAR 0x2A1C /**< Temperature Measurement characteristic UUID. */
#define BLE_UUID_TEMPERATURE_TYPE_CHAR 0x2A1D /**< Temperature Type characteristic UUID. */
#define BLE_UUID_TIME_ACCURACY_CHAR 0x2A12 /**< Time Accuracy characteristic UUID. */
#define BLE_UUID_TIME_SOURCE_CHAR 0x2A13 /**< Time Source characteristic UUID. */
#define BLE_UUID_TIME_UPDATE_CONTROL_POINT_CHAR 0x2A16 /**< Time Update Control Point characteristic UUID. */
#define BLE_UUID_TIME_UPDATE_STATE_CHAR 0x2A17 /**< Time Update State characteristic UUID. */
#define BLE_UUID_TIME_WITH_DST_CHAR 0x2A11 /**< Time With Dst characteristic UUID. */
#define BLE_UUID_TIME_ZONE_CHAR 0x2A0E /**< Time Zone characteristic UUID. */
#define BLE_UUID_TX_POWER_LEVEL_CHAR 0x2A07 /**< TX Power Level characteristic UUID. */
#define BLE_UUID_CSC_FEATURE_CHAR 0x2A5C /**< Cycling Speed and Cadence Feature characteristic UUID. */
#define BLE_UUID_CSC_MEASUREMENT_CHAR 0x2A5B /**< Cycling Speed and Cadence Measurement characteristic UUID. */
#define BLE_UUID_RSC_FEATURE_CHAR 0x2A54 /**< Running Speed and Cadence Feature characteristic UUID. */
#define BLE_UUID_SC_CTRLPT_CHAR 0x2A55 /**< Speed and Cadence Control Point UUID. */
#define BLE_UUID_RSC_MEASUREMENT_CHAR 0x2A53 /**< Running Speed and Cadence Measurement characteristic UUID. */
#define BLE_UUID_SENSOR_LOCATION_CHAR 0x2A5D /**< Sensor Location characteristic UUID. */
#define BLE_UUID_EXTERNAL_REPORT_REF_DESCR 0x2907 /**< External Report Reference descriptor UUID. */
#define BLE_UUID_REPORT_REF_DESCR 0x2908 /**< Report Reference descriptor UUID. */
#define BLE_UUID_LN_FEATURE_CHAR 0x2A6A /**< Location Navigation Service, Feature characteristic UUID. */
#define BLE_UUID_LN_POSITION_QUALITY_CHAR 0x2A69 /**< Location Navigation Service, Position quality UUID. */
#define BLE_UUID_LN_LOCATION_AND_SPEED_CHAR 0x2A67 /**< Location Navigation Service, Location and Speed characteristic UUID. */
#define BLE_UUID_LN_NAVIGATION_CHAR 0x2A68 /**< Location Navigation Service, Navigation characteristic UUID. */
#define BLE_UUID_LN_CONTROL_POINT_CHAR 0x2A6B /**< Location Navigation Service, Control point characteristic UUID. */
#define BLE_UUID_BMS_CTRLPT 0x2AA4 /**< BMS Control Point characteristic UUID. */
#define BLE_UUID_BMS_FEATURE 0x2AA5 /**< BMS Feature characteristic UUID. */
#define BLE_UUID_CGM_MEASUREMENT 0x2AA7 /**< CGM Service, Measurement characteristic UUID*/
#define BLE_UUID_CGM_FEATURE 0x2AA8 /**< CGM Service, Feature characteristic UUID*/
#define BLE_UUID_CGM_STATUS 0x2AA9 /**< CGM Service, Status characteristic UUID*/
#define BLE_UUID_CGM_SESSION_START_TIME 0x2AAA /**< CGM Service, session start time characteristic UUID*/
#define BLE_UUID_CGM_SESSION_RUN_TIME 0x2AAB /**< CGM Service, session run time characteristic UUID*/
#define BLE_UUID_CGM_SPECIFIC_OPS_CTRLPT 0x2AAC /**< CGM Service, specific ops ctrlpt characteristic UUID*/
#define BLE_UUID_PLX_SPOT_CHECK_MEAS 0x2A5E /**< PLX Service, spot check measurement characteristic UUID*/
#define BLE_UUID_PLX_CONTINUOUS_MEAS 0x2A5F /**< PLX Service, continuous measurement characteristic UUID*/
#define BLE_UUID_PLX_FEATURES 0x2A60 /**< PLX Service, feature characteristic UUID*/
#define BLE_UUID_OTS_FEATURES 0x2ABD /**< OTS Service, feature characteristic UUID*/
#define BLE_UUID_OTS_OBJECT_NAME 0x2ABE /**< OTS Service, Object Name characteristic UUID*/
#define BLE_UUID_OTS_OBJECT_TYPE 0x2ABF /**< OTS Service, Object Type characteristic UUID*/
#define BLE_UUID_OTS_OBJECT_SIZE 0x2AC0 /**< OTS Service, Object Size characteristic UUID*/
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