![USR IOT USR-G800V2 Скачать руководство пользователя страница 27](http://html.mh-extra.com/html/usr-iot/usr-g800v2/usr-g800v2_user-manual_1064575027.webp)
USR-G806 User Manual
Technical Support:
h.usriot.com
Jinan USR IOT Technology Limited
www.usriot.com
27
Figure25 serial port parameters
Package mechanism: packaged time calculated according to the baud rate, packing length of 1460 bytes,
it cannot be changed.
Support domain server and the function of the serial port to send a heartbeat and registration packet
Heartbeat package: we choose works as TCP Client, the heartbeat time is set to be send every 5 seconds.
The data content is hexadecimal data.
Heartbeat packets and registration packet is disable by default
Figure26 heartbeat package
3.3.8 VPN Client(PPTP
、
L2TP
、
IPSEC
、
OPENVPN
、
GRE
、
SSTP)
3.3.8.1 PPTP
PPTP is a point-to-point tunnel protocol. It uses a TCP (port 1723) connection to maintain the tunnel. It uses
the general route encapsulation (GRE) technology to encapsulate the data into PPP data frames and transmit
them through the tunnel. It encrypts or compresses the load data in the encapsulated PPP frames. MPPE
encrypts PPP frames through encryption keys generated by MS-CHAP, MS-CHAP V2 or EAP-TLS