蓝牙Mesh设备属性规范V2.0：20200915版

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"蓝牙Mesh设备属性V2.0是蓝牙技术联盟（Bluetooth SIG）的一份官方文档，旨在定义蓝牙Mesh网络中设备所需的各种属性。这份规范于2020年9月15日更新至V2.0版本，由蓝牙SIG的Mesh工作组编撰。文档的修订历史显示，该规范自2017年以来经历了多次升级，以适应蓝牙Mesh技术的发展和改进。" 蓝牙Mesh设备属性V2.0是蓝牙Mesh网络的核心组成部分，它详细阐述了在蓝牙Mesh配置文件和模型规范中必要的设备属性。蓝牙Mesh是一种网络拓扑结构，允许大量蓝牙低功耗（BLE，也称为Bluetooth LE）设备之间进行通信，特别适用于大规模物联网(IoT)解决方案，如智能建筑、工业自动化和智能家居。在蓝牙Mesh网络中，设备属性是定义设备功能和行为的关键元素。这些属性可能包括设备的身份、配置状态、支持的模型以及如何与其他节点交互的信息。例如，一个设备可能有属性来指示其制造商、固件版本、电池电量或网络设置。通过理解并正确实现这些属性，设备可以在Mesh网络中有效地工作，执行诸如消息转发、状态报告和控制指令接收等任务。此文档的修订历史表明，自v1.0以来，蓝牙Mesh设备属性规范经历了多个版本的更新。v1.0到v1.1的升级包含了MeshDeviceProperties CR1.1中的更改，并修正了一些错误（errata）。v1.1到v1.2的更新则纳入了MeshDeviceProperties CR1.2的内容和问题ID12524的处理。最后，v1.2到v2.0的转变引入了MeshDeviceProperties CR2，这通常意味着更多的增强和改进，以保持与最新蓝牙技术的兼容性和性能优化。蓝牙Mesh设备属性V2.0是蓝牙Mesh网络开发人员和设计师的重要参考资料，它提供了确保设备间通信和协作所需的标准和指导。通过遵循这些规范，开发者可以创建可靠、高效的蓝牙Mesh网络，服务于各种应用场景，从而推动IoT技术的广泛应用。

Mesh Device Properties / Specification

Bluetooth SIG Proprietary Page 11 of 64

2 Values and represented values

A device property provides a usage context for a Generic Attributes (GATT) characteristic. Each

characteristic value contains one or more fields. The interpretation of the meaning of the raw value stored

in the characteristic shall be defined in the characteristic definition. Common default rules for

interpretation of characteristics representing scalar values and for byte ordering are given in the following

subsections. These rules apply unless otherwise overridden by a specific characteristic definition.

2.1 Scalar values

When a characteristic field represents a scalar value and unless otherwise specified by the characteristic

definition, the represented value is related to the raw value by the following equations, where the M

coefficient, d, and b exponents are defined per field of the characteristic:

R = C * M * 10

* 2

where R = represented value, C = raw value, M = multiplier (positive or negative integer between -10 and

10, inclusive), d = decimal exponent (positive or negative integer), and b = binary exponent (positive or

negative integer).

The default values are: M = 1, d = 0, and b = 0.

2.1.1 Example decimal exponent

To represent a length in decimeters with a resolution of 1 decimeter within a characteristic value, the

following values are used:

M = 1, d = –1, b = 0

2.1.2 Example binary exponent

To represent a duration in 256ths of a second with a precision of 1/256s within a characteristic value, the

following values are used:

M = 1, d = 0, b = –8

2.1.3 Example multiplier

To represent the horizontal dilution of precision with an accuracy of 1/5 with a precision of 1/5 within a

characteristic value, the following values are used:

M = 2, d = –1, b = 0

2.2 Octet ordering

Where characteristics and descriptors are made up of multiple octets, and unless otherwise specified by

the characteristic definition, the Least Significant Octet (LSO) is the eight low-numbered bits (i.e., bits 0 to

7) of the top-most field in the table. The Most Significant Octet (MSO) is the high-numbered bits of the

bottom-most field in the table. See the example in Table 2.1.

Mesh Device Properties / Specification

Bluetooth SIG Proprietary Page 13 of 64

3 Properties

3.1 Ambient Temperature property group

This category contains the property definitions related to the air temperature surrounding a sensor or a

device.

3.1.1 Average Ambient Temperature In A Period Of Day property

This property represents an average ambient temperature measured over a period of time during the day.

This property can be used to update a column in a histogram. The first value is the average ambient

temperature as measured during a period of time, the second value is the start of the period, and the third

value is the end of the period.

A period of time is represented with a unit of decihour (1/10th of an hour, or 6 minutes); a start time of 0

corresponds to midnight (local time), and the maximum value for the end time is 240. The values reported

represent the most recent measured average values for the periods in the past 24 hours. For example, if

the current time is 11:00, and an average is reported for a time period with a start value of 115 and with

an end value of 116 (corresponding to a time period from 11:30 to 11:36), that measurement represents

the average temperature of that time period during the previous day. This property does not distinguish

between indoor and outdoor ambient temperatures. Typically, the use context is derived from the device

location properties.

Characteristic: Temperature 8 In A Period Of Day

3.1.2 Indoor Ambient Temperature Statistical Values property

This property represents the most recent average, standard deviation, and minimum and maximum

values for a set of measured ambient indoor temperatures, and the period of time over which the

measurements were taken.

Characteristic: Temperature 8 Statistics

3.1.3 Outdoor Statistical Values property

This property represents the most recent average, standard deviation, and minimum and maximum

values for a set measured ambient outdoor temperatures, and the period of time over which the

measurements were taken.

Characteristic: Temperature 8 Statistics

3.1.4 Present Ambient Temperature property

This property represents an ambient air temperature as measured by a temperature sensor. This property

does not distinguish between indoor or outdoor temperature. This context is derived from the location of

the element when this property is used, for example, by using the device location properties. This

property can be used if a temperature sensor can be used both indoors and outdoors.

Characteristic: Temperature 8

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