1. in your version, esp-at should use [ESP-IDF: 588436db47da792736dade1c21fcbf2c879456a4](https://github.com/espressif/esp-at/blob/master/module_config/module_esp32_default/IDF_VERSION), other than 844624ead2b204639f6cedaaf0f31902373022f8. It may bring in potential unknown issues if use unmatched ES...

https://docs.espressif.com/projects/esp-at/en/release-v2.1.0.0_esp32s2/index.html should be the right document for ESP32-S2 v2.1.0.0, please check it. btw, AT+CMD? is supported in v2.2.0.0+. and one more kindly suggestion: could you please consider to use the ESP32-C3 or ESP32-C2 series module inste...

TCP 连接建立完成后，通信是双向的，ESP32 能接收到 PC 端的数据，也就能发送数据到 PC。

建议您抓包看下，ESP32 是否发送了数据，同时也可以在 menuconfig 里打开 debug log 和 LwIP 层日志，从日志口看下具体的交互过程。

Could you please try with latest esp-at version, i fixed a possible similar issue on this commit: https://github.com/espressif/esp-at/com ... 42b7ed9928

if this issue still exists, please provide detailed logs from AT command port and AT log port.
thanks
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和 viewtopic.php?f=34&t=29866 一样。

这是由于 URL 比较长，导致 HTTP 的 TX buffer 超过默认值了 (默认 512 字节)。

如果你是自己编译 ESP-AT 工程，可以修改下 esp-at/esp-idf/components/esp_http_client/include/esp_http_client.h 这个文件里的 DEFAULT_HTTP_BUF_SIZE 大小试试看。

如果你是下载 AT 通用固件的话，可能要等 2 个月多，我会为 AT+HTTPGETSIZE 命令添加 tx size 和 rx size 参数。

oh, no, so you download the ESP32 firmware into ESP32-S2 chip, right?

当前 ESP-AT 不支持 ESP32-S3 芯片，也暂无计划支持。
烧录的固件是软件，不会破坏硬件。重新烧录可用的固件即可。

i'm afraid that AT firmware for ESP32-C3 just supports Bluetooth® Core Specification Version 5.0, does not support BT Classic. more details are in https://docs.espressif.com/projects/esp-at/en/latest/esp32c3/AT_Command_Set/BLE_AT_Commands.html About download guide, please browse https://docs.espress...

Good to know that, thanks for your explanation.