... -powered industrial 32-bits CPU and embedded real time operating system. It supports RS232 (or RS485/RS422), Ethernet and WiFi ... ways, including SMS, ring and data. Support link disconnection when timeout Support APN/VPDN Support DHCP server and client, firewall, NAT, ... , statistics, real time link speed statistics etc. Full protocol support, such as TCP/IP, UDP, ICMP, SMTP, HTTP, POP3, OICQ, TELNET, ...