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2)
Transparent transmission protocol :
0 : TRANSPARENT
is the standard TCP/IP protocol.
In the interface as shown below, the user can set the content (ASCII code or
hexadecimal data) and time interval of the heartbeat packet. The heartbeat packet is a
data packet sent regularly to prevent the operator from cutting off the connection when
the mobile data communication is idle.
As shown in the figure below, the server downloads the data interval setting to deal
with the accidental disconnection of the communication channel, and the DTU side has
not yet been aware of this unexpected situation (at this time, the DTU is still forwarding
the data received by the serial port, but all the forwarded data will be lost) . If the data
upload interval is set to 240 seconds, if the DTU does not receive data from the server
within 240 seconds, it is considered that the connection with the server is interrupted, and
the DTU will try to re-establish the connection; if it is set to 0, the DTU completely ignores
whether to receive or not. to the data sent from the server.
