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ESP8266连接阿里云的流程
* 发送“+++” 目的是让ESP8266退出透传;
* AT+RESTORE 让模块恢复出厂设置;
* AT 判断模块的好坏及工作状态,正常就会回复OK;
* ATE0 关闭回显,这个没什么好说的;
* AT+CWMODE_CUR=1 设置为station模式;
* .AT+CWJAP_CUR=“ssid”,“password” 连接热点,需要根据自己的热点更改;
* AT+CIPSTART=“TCP”,“域名”,端口 连接TCP;
* AT+CIPMODE=1 设置传输模式为透传模式;
* AT+CIPSEND 告诉模块开始传输数据,收到模块的‘>’就证明可以了;
* 登录MQTT
* 发送心跳包
* 发送消息
* 接收消息
以上就是ESP8266模块连接阿里云、和阿里云通信的所有步骤。
这里登录MQTT、发送心跳包、发消息内容都是要根据MQTT协议来的。一个字节都不能错。除此之外登录MQTT的报文内容还要根据阿里云的一机一密来计算。再有就是步骤7到步骤10是有时间限制的。通过TCP连接上阿里云服务器后,如果10s内没有通过MQTT登录,阿里云会自动的把你踢下去。