appinventor安装和mqtt插件

windows编译的mosquitto（mqtt）,可以直接下载使用。

STM32例程，包含一个https(有SSL加密) 服务器和一个mqtt客户端，比较稳定（其实是某产品源码）。

该文件为MQTT纯组件，需要手动导入到App inventor中使用，内含使用方法。 可用于MQTT协议接入阿里云，onenet等云平台。

通过vc实现SSL的客户端与服务端通信,包含完整源码

vc手工实现ssl通信协议的例子，包括客户端和服务端。

Win64OpenSSL_Light-1_1_1b, 用来生成各种证书，用来做SSL 安全和爬虫，以及支付宝支付验证等.

The wolfSSL embedded SSL library (formerly CyaSSL) is a lightweight SSL/TLS library written in ANSI C and targeted for embedded, RTOS, and resource-constrained environments - primarily because of its small size, speed, and feature set. It is commonly used in standard operating environments as well because of its royalty-free pricing and excellent cross platform support. wolfSSL supports industry standards up to the current TLS 1.3 and DTLS 1.3 levels, is up to 20 times smaller than OpenSSL, and offers progressive ciphers such as ChaCha20, Curve25519, NTRU, and Blake2b. User benchmarking and feedback reports dramatically better performance when using wolfSSL over OpenSSL.

1.2、【技升课堂】嵌入式物联网联网编程实战开发之WIFI上报MQTT数据,手机APP查看并控制开发板(WEB端+APP端) 技升课堂， JS103VC开发板， 涵盖4G、wifi、以太网、NB-IOT全联网方式，支持LORA、zigbee、2.4G、蓝牙、433M等无线通讯，支持RS485、RS232、CAN、DI、DO、AI、AO、PWM等有线连接。覆盖物联网领域全行业应用。

自用的ca-bundle.crt证书 SSL certificate problem: unable to get local issuer certificate