@xidameng
I use BW16 module and release branch (or master as it is named now) that was recommended to me here RTL8720DN/BW16 firmware boot problem. Atcmd version is v2.2.1 and SDK version is v3.5.
I made some modifications to this SDK including:
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Support for UART ATcmds and SSL via ATcmds (defines and pin changes only)
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Support for SSL client example (defines only) and provided my own certificate
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Extended LOG_SERVICE_BUFLEN to 4200 and STACKSIZE to 4800 of log_service to support larger buffers
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Changes in ATSO command to support HTTPS OTA update
That’s everything that was changed and the only place I touched SSL is providing my own cert for MQTT connection which shouldn’t affect download process.