[Introduction]：E103-W04 is a high-performance and highly reliable WiFi data transmission module developed by Chengdu Ebyte Electronic Technology Co., Ltd. The module integrates the transparent transmission function, which can be used immediately, and can realize serial port (TTL) data through WiFi. Device networking data interaction. Support IEEE802.11 b/g/n standard, support 4-way Socket connection; support Alibaba Cloud, Baidu Cloud, OneNet, standard MQTT protocol; support TCP/UDP/HTTP/MQTT multiple network communication protocols. The module is small in size, comes with PCB onboard antenna, works in the 2.4GHz frequency band, has low power consumption and fast data transmission. It is widely used in Internet of Things applications such as smart home appliances, smart homes, wireless audio and video, smart toys, medical monitoring, and industrial control.