esp-at application: AT+MQTT docking with Amazon cloud

翻译已于 2022-01-21 17:30:29 修改 · 1.3k 阅读

0 ·

CC 4.0 BY-SA版权

原文链接：https://blog.youkuaiyun.com/espressif/article/details/101714951

文章标签：

#AT #MQTT #AWS #IOT #esp-at

于 2020-03-23 14:23:25 首次发布

AT 指令 (ESP-AT) 同时被 2 个专栏收录

20 篇文章

订阅专栏

历史文档 (Achieves)

9 篇文章

订阅专栏

本文详细介绍了如何使用ESP32的AT+MQTT命令集与AWS IoT进行集成，包括设备证书、私钥和根CA证书的准备，以及基于双向认证的MQTT集成步骤。

AT Application: https://github.com/espressif/esp-at
AT+MQTT Documentation: https://docs.espressif.com/projects/esp-at/en/latest/

AT+MQTT Integration into AWS IoT

This article explains how to connect devices to AWS IoT using AT commands.

AT+MQTT command description AT+MQTT Command Set

Preparation

Please refer to AWS IoT Developer Guide and obtain:

xxx.cert.pem(device certificate)
xxx.private.key(private key)
AmazonRootCA1.pem(root CA certificate)
xxx-ats.iot.us-east-2.amazonaws.com(endpoint)

Suggestion:

All devices must have a device certificate, private key, and root CA certificate installed in order to communicate with AWS IoT. For details, please refer to AWS IoT Developer Guide
Select Ohio as your region
Note how to activate certificates described in the developer guide
Read AWS IoT Developer Guide repeatedly to deeper understanding

`MQTT` Integration into AWS IoT based on Two-Way Authentication

Replace Certificate

AmazonRootCA1.pem replaces components/customized_partitions/raw_data/mqtt_ca/mqtt_ca.crt
xxx.cert.pem replaces components/customized_partitions/raw_data/mqtt_cert/mqtt_client.crt
xxx.private.key replaces components/customized_partitions/raw_data/mqtt_key/mqtt_client.key

Compile Flashing AT Firmware

Please refer to Compiling ESP-AT Project to recompile and flash AT firmware

Integrate AT+MQTT into AWS IoT Commands

AT+CWMODE=1
AT+CWJAP="ssid","password"
AT+CIPSNTPCFG=1,8,"ntp1.aliyun.com"
AT+CIPSNTPTIME?

AT+MQTTUSERCFG=0,4,"esp32-at","espressif","1234567890",0,0,""
AT+MQTTCONN=0,"xxx-ats.iot.us-east-2.amazonaws.com",8883,1
AT+MQTTSUB=0,"esp32/at",1
AT+MQTTPUB=0,"esp32/at","hello aws!",1,0

Notes:

If the second parameter of AT+MQTTUSERCFG is 4, it is authenticated by both sides and cannot be changed.
In AT+MQTTCONN=0,"<endpoint>",8883,1, endpoint is the endpoint in preparation phase, and port 8883 cannot be changed
Other AT+MQTT parameters are user-definable