What version of AT do you use?

For ESP32-C3 v2.2.0.0 version, It does not support BLE function. If you want to use BLE functions, you can download ESP32-C3 v2.3.0.0 from https://docs.espressif.com/projects/esp ... aries.html.

For BLE SPP, you can refer to https://docs.espressif.com/projects/esp ... mples.html
For Classic BT, you can refer to https://docs.espressif.com/projects/esp ... mples.html

AT version:1.2. 0.0 is too old!

Here I recommend that you use the latest AT version v2.2.1.0 for ESP8266 series. You can download firmware from https://github.com/espressif/esp-at/rel ... .0_esp8266.

For MQTT examples, you can refer to https://docs.espressif.com/projects/esp-at/en/latest/AT_Command_Examples/MQTT_AT_Examples.html#mqtt-over-tls-with-a-local-mqtt-broker. For PKI files, you can refer to https://docs.espressif.com/projects/esp-at/en/latest/Compile_and_Develop/how_to_generate_pki_file...

Please refer to https://docs.espressif.com/projects/esp ... mples.html

Judging from the version you provided, this is your own compiled version, and it seems that some source files in esp-idf have been modified. My suggestion is you can download AT v2.2.0.0 WROVER-32 from https://docs.espressif.com/projects/esp-at/en/release-v2.2.0.0_esp32/AT_Binary_Lists/ESP32_AT_bina...

Sorry, ESP-AT current support for nimble is not very friendly.

Hello, I don't quite understand what you mean. Could you describe the problem in detail?

For AT communicate over SPI, you can refer to https://docs.espressif.com/projects/esp ... PI_AT.html.

It is recommended that you execute the git submodule update --init --recursive command in the esp-idf directory in ESP-AT root directory. If it can't be solved, you can post your compilation steps for a look.

I don't know what you want to say. Could you describe it clearly ?

Form my point, I guess you want to connect router through a Ethernet, I recommend you to refer to https://docs.espressif.com/projects/esp ... ernet.html first.