这个好像也用不到，不过可以先贴出来。简单看了一下也没深入分析，直接扒过来了，感觉涉及到了上位机的学习了。我这下位机的可能用不到，就是贴过来好了。

应用概述

使用 AT 方式连接阿里云分为一机一密和一型一密，其中一机一密又包含 HTTP 认证二

次连接和 MQTT 直连两种方式。

步骤

1. 训练波特率

2. 激活 PDP （之前也研究过了，也设置过了。下面再贴一遍过来吧。）

使用如下AT命令，激活了一路id为1、APN为自动获取的默认APN的PDP承载（就是连接并开启了相关通道，无需在担心通讯了，算是设备本身的资料了）

AT+SAPBR=3,1,"CONTYPE","GPRS"

AT+SAPBR=3,1,"APN",""

AT+SAPBR=1,1

AT+SAPBR=2,1

+SAPBR: 1,1,"10.55.40.48"

3. 连接阿里云

这个本次研究就是这个了。

材料准备

准备设备证书及产品证书。

--设备证书

{

"ProductKey": "a1qsHBbKtmc",

"DeviceName": "866714044533668",

"DeviceSecret": "c25262e140bb58d4ec3de5028a2cc836"

}--产品证书

{

"ProductSecret": "nNmPacH5aL8EViD4",

"ProductKey": "a1qsHBbKtmc"

}

阿里云操作

产品操作

打开阿里云找到物联网平台，开通业务后进入控制台。

点开设备管理的产品页面，点击新建产品。根据需求和图示说明创建产品。

具体详细介绍见阿里云页面（如何在物联网平台创建产品_物联网平台(IoT)-阿里云帮助中心）

设备操作

创建产品完成后就可以进入设备页面添加设备，在对应产品页面进入设备管理，按照提示添

加设备（在做正式产品时建议使用 imei 为 devicename，方便后期维护）

阿里云设备创建

连接阿里云

一机一密 AT HTTP 鉴权连接

首先需要使用 HmacMD5 计算哈希值用于签名，使用网址：计算工具

明文：

clientId866714044533668deviceName866714044533668productKeya1qsHBbKtmc

秘钥： c25262e140bb58d4ec3de5028a2cc836

结果： 655d19e9c43e27d8c66419a6724eb56a

拼接 DOWNLOAD 参数

productKey=a1qsHBbKtmc&sign=655d19e9c43e27d8c66419a6724eb56a&clientId=866714044533668&deviceName=866714044533668

具体交互流程如下所示

[2021-05-21 20:24:55.620]# SEND ASCII>

AT+HTTPINIT

[2021-05-21 20:24:55.674]# RECV ASCII>

AT+HTTPINIT

[2021-05-21 20:25:04.547]# SEND ASCII>

AT+HTTPPARA="URL",https://iot-auth.cn-shanghai.aliyuncs.com/auth/devicen

ame

[2021-05-21 20:25:04.601]# RECV ASCII>

AT+HTTPPARA="URL",https://iot-auth.cn-shanghai.aliyuncs.com/auth/devicen

ame

[2021-05-21 20:25:11.724]# SEND ASCII>

AT+HTTPPARA="USER_DEFINED","Content-Type:

application/x-www-form-urlencoded"

[2021-05-21 20:25:11.776]# RECV ASCII>

AT+HTTPPARA="USER_DEFINED","Content-Type:

application/x-www-form-urlencoded"

[2021-05-21 20:25:22.028]# SEND ASCII>

AT+HTTPDATA=120,20000

[2021-05-21 20:25:22.078]# RECV ASCII>

AT+HTTPDATA=120,20000

DOWNLOAD

[2021-05-21 20:25:29.643]# SEND ASCII>

productKey=a1qsHBbKtmc&sign=655d19e9c43e27d8c66419a6724eb56a&clientId=866714044533668&deviceName=866714044533668

[2021-05-21 20:25:42.079]# RECV ASCII>

[2021-05-21 20:25:52.388]# SEND ASCII>

AT+HTTPACTION=1

[2021-05-21 20:25:52.450]# RECV ASCII>

AT+HTTPACTION=1

[2021-05-21 20:25:53.034]# RECV ASCII>

+HTTPACTION: 1,200,124

[2021-05-21 20:25:59.556]# SEND ASCII>

AT+HTTPREAD

[2021-05-21 20:25:59.624]# RECV ASCII>

AT+HTTPREAD

+HTTPREAD: 124

{"code":200,"data":{"iotId":"8rCqP6OVgi90P5a479IC000000","iotToken":"^1^1621599952882^218a0a267fc6c36"},"message":"success"}

OK--收到服务器返回数据其中 iotId 为 MQTT Client 的用户名，iotToken 的值为 MQTT Clientd 的密码

[2021-05-21 20:29:48.876]# SEND ASCII>

AT+MCONFIG="866714044533668","8rCqP6OVgi90P5a479IC000000","^1^1621599952882^218a0a267fc6c36"

[2021-05-21 20:29:48.932]# RECV ASCII>

AT+MCONFIG="866714044533668","8rCqP6OVgi90P5a479IC000000","^1^1621599952882^218a0a267fc6c36"

[2021-05-21 20:29:57.900]# SEND ASCII>

AT+SSLMIPSTART="a1qsHBbKtmc.iot-as-mqtt.cn-shanghai.aliyuncs.com",1883

[2021-05-21 20:29:57.950]# RECV ASCII>

AT+SSLMIPSTART="a1qsHBbKtmc.iot-as-mqtt.cn-shanghai.aliyuncs.com",1883

[2021-05-21 20:29:58.474]# RECV ASCII>

CONNECT OK

[2021-05-21 20:30:03.332]# SEND ASCII>

AT+MCONNECT=1,120

[2021-05-21 20:30:03.383]# RECV ASCII>

AT+MCONNECT=1,120

[2021-05-21 20:30:03.493]# RECV ASCII>

CONNACK OK

一机一密 AT 直连 MQTT

当设备属于公共实例，使用一型一密预注册认证方式时，动态注册参数如下：

mqttClientId:clientId+"|securemode=3,signmethod=hmacsha1,timestamp=132323232|"

mqttUsername: deviceName+"&"+productKey

mqttPassword: sign_hmac(deviceSecret,content)

具体交互流程如下所示

[2021-05-21 21:26:59.670]# SEND ASCII>

AT+MCONFIG="866714044533668|securemode=3,signmethod=hmacmd5|","866714044533668&a1qsHBbKtmc","655d19e9c43e27d8c66419a6724eb56a"

[2021-05-21 21:26:59.725]# RECV ASCII>

AT+MCONFIG="866714044533668|securemode=3,signmethod=hmacmd5|","866714044533668&a1qsHBbKtmc","655d19e9c43e27d8c66419a6724eb56a"

[2021-05-21 21:27:00.958]# SEND ASCII>

AT+SSLMIPSTART="a1qsHBbKtmc.iot-as-mqtt.cn-shanghai.aliyuncs.com",1883

[2021-05-21 21:27:01.007]# RECV ASCII>

AT+SSLMIPSTART="a1qsHBbKtmc.iot-as-mqtt.cn-shanghai.aliyuncs.com",1883

[2021-05-21 21:27:01.567]# RECV ASCII>

CONNECT OK

[2021-05-21 21:27:02.333]# SEND ASCII>

AT+MCONNECT=1,120

[2021-05-21 21:27:02.385]# RECV ASCII>

AT+MCONNECT=1,120

[2021-05-21 21:27:02.527]# RECV ASCII>

CONNACK OK

一型一密 AT 方式连接

一型一密与一机一密的主要区别在于第一次连接的时候需要根据协议请求秘钥。首先需要在阿里云打开动态注册开关如下图所示。

用到的参数如下所示。

{

"ProductSecret": "nNmPacH5aL8EViD4",

"ProductKey": "a1qsHBbKtmc"

"DeviceName" "866714044533668"

}--random 为随机数，长度不定

productKey=a1qsHBbKtmc&deviceName=866714044533668&random=123456&sign=073074d8b722eacb1f6d2054d99e9d64&signMethod=HmacMD5e10adc3949ba59abbe56e057f20f883e

明文：deviceName866714044533668productKeya1qsHBbKtmcrandom123456

秘钥：nNmPacH5aL8EViD4

HmacMD5 计算结果：073074d8b722eacb1f6d2054d99e9d64d8d847e2558c6382fc35d2c91f626501a1qsHBbKtmcnNmPacH5aL8EViD4

ProductKey = b1KCi45LcCP

ProductSecret = VWll9fiYWKiwraBk

DeviceName = 862991419835241

productKey=a1qsHBbKtmc&deviceName=866714044533668&random=123456&sign=073074d8b722eacb1f6d2054d99e9d64&signMethod=HmacMD5deviceName866714044533668productKeya1qsHBbKtmcrandom123456nNmPacH5aL8EViD4073074d8b722eacb1f6d2054d99e9d64

当设备属于公共实例，使用一型一密预注册认证方式时，动态注册参数如下：

mqttClientId:

clientId+"|securemode=2,authType=xxxx,random=xxxx,signmethod=xxxx|"

mqttUserName: deviceName+"&"+productKey

mqttPassword: sign_hmac(productSecret,content)

AT 交互流程如下

[21:37:43.379]发→◇AT+HTTPINIT

[21:37:43.383]收←◆AT+HTTPINIT

[21:37:48.704]发

→◇AT+HTTPPARA="URL","https://iot-auth.cn-shanghai.aliyuncs.com/auth/register/device"

[21:37:48.713]收

←◆AT+HTTPPARA="URL","https://iot-auth.cn-shanghai.aliyuncs.com/auth/register/device"