All the documentation is in Chinese. There’s also an “ESP8266 IoT SDK”, but from a quick glance at the code, this appears to be an SDK for the SOC on the module, not a simple way to connect ...
Security has always been an issue with IoT devices. Off the shelf devices ... The normal ways to do HTTPS with an ESP8266 is to either use Fingerprints, or to use client.setInsecure().
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