Index of Abbreviations

A2DP

Advanced Audio Distribution Profile

高级音频分发框架

ADC

Analog-to-Digital Converter

模拟数字转换器

ALPN

Application Layer Protocol Negotiation

应用层协议协商

AT

AT stands for “attention”.

AT 是 attention 的缩写。

AT command port

The port that is used to send AT commands and receive responses. More details are in the AT port introduction.

AT 命令端口

也称为 AT 命令口，用于发送 AT 命令和接收响应的端口。更多介绍请参考 AT 端口。

AT log port

The port that is used to output log. More details are in the AT port introduction.

AT 日志端口

也称为 AT 日志口，用于输出 AT 日志的端口。更多介绍请参考 AT 端口。

AT port

AT port is the general name of AT log port (that is used to output log) and AT command port (that is used to send AT commands and receive responses). Please refer to Hardware Connection for default AT port pins and How to Set AT Port Pins for how to customize them.

AT 端口

AT 端口是 AT 日志端口（用于输出日志）和 AT 命令端口（用于发送 AT 命令和接收响应）的总称。请参考 Hardware Connection 了解默认的 AT 端口管脚，参考 How to Set AT Port Pins 了解如何自定义 AT 端口管脚。

Bluetooth LE

Bluetooth Low Energy

低功耗蓝牙

BluFi

Wi-Fi network configuration function via Bluetooth channel

BluFi 是一款基于蓝牙通道的 Wi-Fi 网络配置功能

Command Mode

Default operating mode of AT. In the command mode, any character received by the AT command port will be treated as an AT command, and AT returns the command execution result to the AT command port. AT enters Data Mode from Command Mode in the following cases.

After sending the AT+CIPSEND set command successfully and returns >.
After sending the AT+CIPSEND execute command successfully and returns >.
After sending the AT+CIPSENDL set command successfully and returns >.
After sending the AT+CIPSENDEX set command successfully and returns >.
After sending the AT+SAVETRANSLINK set command successfully and sending the AT+RST command and restart the module.

In the data mode, send the +++ command, AT will exit from Data Mode and enter the Command Mode.

命令模式

AT 的默认工作模式。在命令模式下，AT 命令端口收到的任何字符都会被当作 AT 命令进行处理，同时 AT 会在命令端口回复命令执行结果。 AT 在下列情况下，会从命令模式进入数据模式。

发送 AT+CIPSEND 设置命令成功，回复 > 之后
发送 AT+CIPSEND 执行命令成功，回复 > 之后
发送 AT+CIPSENDL 设置命令成功，回复 > 之后
发送 AT+CIPSENDEX 设置命令成功，回复 > 之后
发送 AT+SAVETRANSLINK 设置命令成功，再发送 (AT+RST) 命令，模组重启之后

在数据模式下，发送 +++ 命令，会从数据模式退出，进入命令模式。

Data Mode

In the data mode, any character received by the AT command port will be treated as data (except for special +++) instead of the AT command, and these data will be sent to the opposite end without modification. AT enters Data Mode from Command Mode in the following cases.

After sending the AT+CIPSEND set command successfully and returns >.
After sending the AT+CIPSEND execute command successfully and returns >.
After sending the AT+CIPSENDL set command successfully and returns >.
After sending the AT+CIPSENDEX set command successfully and returns >.
After sending the AT+SAVETRANSLINK set command successfully and sending the AT+RST command and restart the module.

In the data mode, send the +++ command, AT will exit from Data Mode and enter the Command Mode.

数据模式

在数据模式下，AT 命令端口收到的任何字符都会被当作数据（除了特殊的 +++），而不是 AT 命令，这些数据会无修改的发往对端。 AT 在下列情况下，会从命令模式进入数据模式。

发送 AT+CIPSEND 设置命令成功，回复 > 之后
发送 AT+CIPSEND 执行命令成功，回复 > 之后
发送 AT+CIPSENDL 设置命令成功，回复 > 之后
发送 AT+CIPSENDEX 设置命令成功，回复 > 之后
发送 AT+SAVETRANSLINK 设置命令成功，再发送 AT+RST 命令，模组重启之后

在数据模式下，发送 +++ 命令，会从数据模式退出，进入命令模式。

DHCP

Dynamic Host Configuration Protocol

动态主机配置协议

DNS

Domain Name System

域名系统

DTIM

Delivery Traffic Indication Map

延迟传输指示映射

GATTC

Generic Attributes client

GATT 客户端

GATTS

Generic Attributes server

GATT 服务器

HID

Human Interface Device

人机接口设备

I2C

Inter-Integrated Circuit

集成电路总线

ICMP

Intemet Control Message Protocol

因特网控制报文协议

LwIP

A Lightweight TCP/IP stack

一个轻量级的 TCP/IP 协议栈

LWT

Last Will and Testament

遗嘱

MAC

Media Access Control

MAC 地址

mDNS

Multicast Domain Name System

多播 DNS

manufacturing nvs

Manufacturing Non-Volatile Storage. manufacturing nvs stores all certificates, private keys, GATTS data, module information, Wi-Fi configurations, UART configurations, etc. The default values of these configurations are defined in raw_data . These configurations are finally built into the mfg_nvs.bin file and downloaded to the flash at the address defined in at_customize.csv.

一个适用于量产的 NVS。manufacturing nvs 中存储了 AT 固件默认所用到的所有证书、私钥、GATTS 数据、模组信息、Wi-Fi 配置、UART 配置等。这些配置信息，默认值在 raw_data 里，最终生成了 mfg_nvs.bin，烧录到 at_customize.csv 中定义的位置。

MSB

Most Significant Bit

最高有效位

MTU

maximum transmission unit

最大传输单元

NVS

Non-Volatile Storage

非易失性存储器

Normal Transmission Mode

Default Transmission Mode

In normal transmission mode, users can send AT commands. For examples, users can send MCU data received by AT command port to the opposite end of transmission by AT+CIPSEND; and the data received from the opposite end of transmission will also be returned to MCU through AT command port with additional prompt: +IPD.

During a normal transmission, if the connection breaks, ESP32-S2 will give a prompt and will not attempt to reconnect.

More details are in Transmission Mode Shift Diagram.

普通传输模式

默认传输模式

在普通传输模式下，用户可以发送 AT 命令。例如，用户可以通过 AT+CIPSEND 命令，发送 AT 命令口收到的 MCU 数据到传输对端。从传输对端收到的数据，会通过 AT 命令口返回给 MCU，同时会附带 +IPD 信息。

普通传输模式时，如果连接断开，ESP32-S2 不会重连，并提示连接断开。

更多介绍请参考 Transmission Mode Shift Diagram。

OWE

Opportunistic Wireless Encryption. OWE is a Wi-Fi standard which ensures that the communication between each pair of endpoints is protected from other endpoints.

More details are in Wikipedia.

机会性无线加密。OWE 是一种 Wi-Fi 标准，它确保每对端点之间的通信受到保护，不受其他端点的影响。

更多介绍请参考维基百科。

Passthrough Mode

Also called as “Passthrough Sending & Receiving Mode”.

In passthrough mode, users cannot send AT commands except special +++ command. All MCU data received by AT command port will be sent to the opposite end of transmission without any modification; and the data received from the opposite end of transmission will also be returned to MCU through AT command port without any modification.

During the Wi-Fi passthrough transmission, if the connection breaks, ESP32-S2 (as client) will keep trying to reconnect until +++ is input to exit the passthrough transmission; ESP32-S2 (as server) will shutdown the old connection and listen new connection until +++ is input to exit the passthrough transmission.

More details are in Transmission Mode Shift Diagram.

透传模式

也称为 “透传发送接收模式”。

在透传模式下，用户不能发送其它 AT 命令，除了特别的 +++ 命令。AT 命令口收到的所有的 MCU 数据都将无修改地，发送到传输对端。从传输对端收到的数据也会通过 AT 命令口无修改地，返回给 MCU。

Wi-Fi 透传模式传输时，如果连接断开，ESP32-S2 作为客户端时，会不停地尝试重连，此时单独输入 +++ 退出透传，则停止重连；ESP32-S2 作为服务器时，会关闭连接同时监听新的连接，此时单独输入 +++ 退出透传。

更多介绍请参考 Transmission Mode Shift Diagram。

Transmission Mode Shift Diagram

More details are in the following introduction.

Normal Transmission Mode (普通传输模式)
Passthrough Receiving Mode (透传接收模式)
Passthrough Mode (透传模式)
AT+CIPMODE
AT+CIPSEND
+++
AT+SAVETRANSLINK

Passthrough Receiving Mode

The temporary mode between Normal Transmission Mode and Passthrough Mode.

In passthrough receiving mode, AT cannot send any data to the opposite end of transmission; but the data received from the opposite end of transmission can be returned to MCU through AT command port without any modification. More details are in Transmission Mode Shift Diagram.

透传接收模式

在普通传输模式和透传模式之间的一个临时模式。

在透传接收模式，AT 不能发送数据到传输对端；但 AT 可以收到来自传输对端的数据，通过 AT 命令口无修改地返回给 MCU。更多介绍请参考 Transmission Mode Shift Diagram。

PBC

Push Button Configuration

按钮配置

PCI Authentication

Payment Card Industry Authentication. In ESP-AT project, it refers to all Wi-Fi authentication modes except OPEN and WEP.

PCI 认证，在 ESP-AT 工程中指的是除 OPEN 和 WEP 以外的 Wi-Fi 认证模式。

PKI

A public key infrastructure (PKI) is a set of roles, policies, hardware, software and procedures needed to create, manage, distribute, use, store and revoke digital certificates and manage public-key encryption.

More details are in Public Key Infrastructure.

公开密钥基础建设。公开密钥基础建设（PKI）是一组由硬件、软件、参与者、管理政策与流程组成的基础架构，其目的在于创造、管理、分配、使用、存储以及撤销数字证书。

更多介绍请参考公开密钥基础建设。

PLCP

Physical Layer Convergence Procedure

PLCP 协议，即物理层会聚协议

PMF

protected management frame

受保护的管理帧

PSK

Pre-shared Key

预共享密钥

PWM

Pulse-Width Modulation

脉冲宽度调制

QoS

Quality of Service

服务质量

RTC

Real Time Controller. A group of circuits in SoC that keeps working in any chip mode and at any time.

实时控制器，为 SoC 中的一组电路，在任何芯片模式下都能随时保持工作。

SMP

Security Manager Protocol

安全管理协议

SNI

Server Name Indication

服务器名称指示

SNTP

Simple Network Time Protocol

简单网络时间协议

SPI

Serial Peripheral Interface

串行外设接口

SPP

Serial Port Profile

SPP 协议，即串口协议

SSL

Secure Sockets Layer

SSL 协议，即安全套接字协议

system message

Data sent via AT command port to MCU. Each system message usually ends with \r\n. Detailed system message descriptions are available at AT Messages.

系统消息