[Introduction]：E90-DTU(400SL22)E is a wireless gateway (Ethernet interface data transmission radio) that supports 10M/100M rate and is developed by Chengdu Ebyte based on LoRa communication technology and Ethernet protocol. Supports 2-way Socket and provides six working modes: TCP Server, TCP Client, UDP Server, UDP Client, HTTP Client, and MQTT Client. It also supports six-way client connections in TCP server mode.