Maybe you can have a try with the latest master of esp-at, it seems solved an issue like that https://github.com/espressif/esp-at/com ... 53488ffb2d .

The latest RTOS 3.4 is released recently, maybe you could have a try to see if the issue persists?

找块官方模组对比试试看呢？如果官方模组可以，你的不可以，那可能就是硬件问题；如果官方模组和你的模组都不可以，那可能就是你操作或者用的工具之类的有问题。

感觉你的 SDK 版本太老了，考虑用最新的 RTOS SDK 试试么？https://github.com/espressif/ESP8266_RTOS_SDK

Maybe you could have a try with the latest RTOS SDK https://github.com/espressif/ESP8266_RTOS_SDK .

Could this example help？https://github.com/espressif/ESP8266_RTOS_SDK/blob/master/components/nvs_flash/test/test_nvs.c

The latest RTOS 3.4 is just released recently, maybe you can have a try with the latest version to see if the issue persists.

If you set it as then it should be SSL connection. Or maybe you can try to capture Wi-Fi packets to make sure of it.
And some SSL server may need certificates to connect to it, but google.com is not one of them.

Could this example help? https://github.com/espressif/ESP8266_RT ... herals/i2c

Since ESP8266_RTOS_SDK is similar to ESP-IDF, if there is no websocket example in ESP8266_RTOS_SDK, maybe you can have a try with the example in ESP-IDF. https://github.com/espressif/esp-idf/tr ... /websocket