LTE-520 DTU is a wireless data acquisition device. It supports China Unicom, China Mobile 2G/3G/4G and Telecom 4G networks, PPP, TCP, UDP, HTTP, MQTT, ICMP and other complex network protocols and multiple SOCKET interface standards. It provides full transparent data transmission mode for users. It supports custom heartbeat packets, registration packets, data leading packets, and supports IoT cloud. Users don't need to build a server, and can use our IoT cloud to complete transparent testing. DTU also supports industrial configuration applications. Users don't need to care about complex network protocols. Through the transparent serial port, they can perform wireless data transmission and allow your devices to access the Internet anytime and anywhere.