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For my NodeMCU Ai-WB2-12F-Kit , it's pre-loaded with Ai-Thinker Combo AT Command firmware, NOT the so called General AT Command Set. Locate the Ai-Thinker Combo AT Command Set: Currently, Combo AT Command Set is not listed in English version of Ai-WB2 Series Module page . Switch to Chinese version . Scroll download, click to open " Ai-WB2系列模组Combo-AT_V4.18版本指令集 (Ai-WB2 series module Combo-AT_V4.18 command set) ". In this video I try it using Arduino IDE's Serial Monitor.

Ai-WB2-12F is a Wi-Fi&BT module developed by Ai-Thinker Technology Co., LTD. The module is equipped with BL602 chip as the core processor and supports Wi-Fi 802.11b/ g/n protocol and BLE 5.0 protocol. The BL602 chip has a low-power 32-bit RISC CPU, 276KB RAM,and awealth of peripheral interfaces, including SDIO, SPI, UART, I2C, IR Remote, PWM,ADC, DAC, PIR and GPIO etc. It can be widely used in Internet of Things (IoT), mobile devices, wearable electronic devices, smart home and other fields. Ai-WB2-12F-Kit is a development board designed for Ai-WB2-12F modules. Pinouts: Ai-WB2-12F-Kit pinout Ai-WB2-12F pinout Product Page: ~  Ai-WB2-12F ~  Ai-WB2-12F-Kit Specification: ~  Ai-WB2-12F Specification ~  Ai-WB2-12F-Kit Specification more links: ~  Ai-WB2 Series Module ~ BL602 WIFI+BLE Module doc in Google Driver more: ~  First power-up NodeMCU Ai-WB2-12F-Kit, test with Ai-Thinker Combo AT Com...