esp_modem maybe.

Thanks! That's it!

If you are looking for AT firmware that can be run on the ESP32, rather than the AT client component, you can find it here.

https://github.com/espressif/esp-at/releases

I'm afraid this is a AT server, not the one I'm talking about.

Currently, I am using the ESP32-C6 as a gateway to convert protocols such as CAN, MODBUS, and MQTT.

Now, I need to implement remote connectivity via NB-IoT. Since the NB-IoT module uses the AT command protocol over UART, an AT Client module is required.

However, I could only find the ESP-AT ...

thank you for ur reply.
I will update to v4.2 to see how it goes

I run a TCP server on esp32, esp32 connect to a AP as a station. But the wifi state always change from run to init, and it will reset my Tcp server. System log shows:

I (270506) wifi:state: run -> init (ce00)
I (270506) wifi:pm stop, total sleep time: 63165857 us / 205445718 us
I (270506) wifi:new ...

fixed. Just idf.py fullclean

How could I fix the error? I'm using IDF release/v4.1。

Is it traditional Verilog/VHDL or scala based chisel/spinalhdl?

将GPIO34,35,39初始化为数字输入，并且上拉，开机过程中串口打印如下信息：

I (319) gpio: GPIO[26]| InputEn: 0| OutputEn: 1| OpenDrain: 0| Pullup: 0| Pulldown: 0| Intr:0
I (328) gpio: GPIO[27]| InputEn: 0| OutputEn: 1| OpenDrain: 0| Pullup: 0| Pulldown: 0| Intr:0
I (338) gpio: GPIO[18]| InputEn: 1| OutputEn: 0| OpenDrain: 0 ...

谢谢回复。我是pull的最新master分支才发现这个问题的。
现在我回退到v3.2 rc版本，这个问题就消失了