ESP-AT Firmware Differences

[中文]

This document compares the differences among AT firmwares of a certain ESP32-C2 series in terms of the supported commands set, hardware, and supported modules.

ESP32-C2 Series

This section describes the differences among AT firmwares of ESP32-C2 series, including

  • ESP32C2-2MB-AT-Vx.x.x.x.zip (referred to as ESP32C2-2MB Bin in this section);

  • ESP32C2-4MB-AT-Vx.x.x.x.zip (referred to as ESP32C2-4MB Bin in this section);

  • ESP32C2-BLE-2MB Bin (firmware is not released, but you can download the esp32c2-ble-2mb-at firmware from GitHub Actions, or Compile ESP-AT Project Locally by yourself);

Supported Command Set

The table lists which command set is supported by default in the official AT firmware applicable to ESP32-C2 series of modules (marked with icon-green-check), which is not supported by default but can be supported after configuration of the ESP-AT project (marked with icon-orange-check), and which is not supported at all (marked with icon-red-cross). Note that the command set that is not shown in this table is not supported either. Applicable firmware that has not been officially released requires compilation by yourself. Those self-compiled firmware cannot be upgraded OTA from Espressif official server.

Command Set

ESP32C2-2MB Bin

ESP32C2-4MB Bin

ESP32C2-BLE-2MB Bin

base

icon-green-check

icon-green-check

icon-green-check

user

icon-green-check

icon-green-check

icon-green-check

Wi-Fi

icon-green-check

icon-green-check

icon-red-cross

TCP-IP

icon-green-check

icon-green-check

icon-red-cross

mDNS

icon-green-check

icon-green-check

icon-red-cross

WPS

icon-green-check

icon-green-check

icon-red-cross

SmartConfig

icon-green-check

icon-green-check

icon-red-cross

ping

icon-green-check

icon-green-check

icon-red-cross

MQTT

icon-green-check

icon-green-check

icon-red-cross

HTTP

icon-orange-check

icon-green-check

icon-red-cross

Bluetooth LE

icon-red-cross

icon-red-cross

icon-green-check

BluFi

icon-red-cross

icon-green-check

icon-red-cross

FileSystem

icon-orange-check

icon-orange-check

icon-orange-check

driver

icon-orange-check

icon-orange-check

icon-orange-check

WPA2 enterprise

icon-orange-check

icon-orange-check

icon-red-cross

WEB server

icon-orange-check

icon-orange-check

icon-red-cross

WebSocket

icon-orange-check

icon-orange-check

icon-red-cross

OTA

icon-green-check

icon-green-check

icon-red-cross

Hardware Differences

Hardware

ESP32C2-2MB Bin

ESP32C2-4MB Bin

ESP32C2-BLE-2MB Bin

Flash

2 MB

4 MB

2 MB

PSRAM

icon-red-cross

icon-red-cross

icon-red-cross

UART Pins 1

TX: 7
RX: 6
CTS: 19
RTS: 20
TX: 7
RX: 6
CTS: 5
RTS: 4
TX: 7
RX: 6
CTS: 5
RTS: 4
1

UART pins can be customized. See How to Set AT Port Pins for details.

Supported Modules

The table below lists the modules or chips that are default supported by the officially released ESP32-C2 series AT firmware (indicated by icon-green-check), the modules that are not supported by default but can be modified to be supported using the at.py Tool (indicated by icon-orange-check), and the modules that are not supported at all (indicated by icon-red-cross). For modules that are not supported at all, you can refer to Compile ESP-AT Project Locally to modify the configuration as needed for support.

Module/Chip

ESP32C2-2MB Bin

ESP32C2-4MB Bin

ESP32C2-BLE-2MB Bin

ESP8684-MINI-1/1U

icon-green-check

icon-green-check

icon-green-check

ESP8684-WROOM-02C/02UC

icon-green-check

icon-green-check

icon-green-check

ESP8684-WROOM-03

icon-red-cross

icon-green-check

icon-green-check

ESP8684-WROOM-05

icon-red-cross

icon-green-check

icon-green-check

ESP8684-WROOM-07

icon-red-cross

icon-orange-check

icon-orange-check