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E90-DTU(Ethernet) wireless transceiver
5.4 UDP Client characteristics
(1) UDP Client is a connectionless transmission protocol that provides a simple, unreliable information transfer service,
without connection establishment and disconnection, only IP and port are needed to send data. Generally used for data
transmission scenarios where packet loss rate is not required, data packets are small and the frequency is fast, and data is
transmitted to a specified IP.
(2) In UDP Client mode, the E90-DTU will only communicate with the target IP's target port, if the data is not from
this channel, it will not be received by the E90-DTU.
(3) In UDP Client mode, if the target address is set to 255.255.255.255, it will broadcast within the whole UDP
network segment, and it can also receive broadcast data ， E90-DTU supports broadcast within the supporting network
segment, such as the mode of xxx.xxx.xxx.255.
6. Special function
6.1 Short connection
The use of short connections is mainly to save server resources, and is generally applied to multipoint-to-point scenarios.
Short connections is to ensure that existing connections are useful connections and do not require additional controls for
filtering.
The short connection function is applied in the TCP Client mode. After the short connection function is enabled, when
sending data. If no data is received from the serial port or network port within the setting time, the connection will be
automatically disconnected. The short connection function is turned off by default, and the disconnection time can be set
after the function is turned on, the range is 2~255S.
6.2 Registration packet mechanism
In the network transparent transmission mode, users can make the module send registration packets to the server. The
registration packet is for the server to identify the data source device, or as a password to obtain server authorization.
E90-DTU has 4 registration packet mechanisms:
Sending MAC when connecting: The module will send the its own MAC address to the device when the connection is
established.
Sending user-defined data when connecting: The module sends a user-defined data to the device when the connection
is established
Each packet of data sending MAC: The module will add its MAC address in front of each frame of data sent.
Each packet of data sending user-defined data: The module will add its user-defined data in front of each frame of data
sent.
Chengdu Ebyte Electronic Technology Co., Ltd.
Figure 6 UDP Client
E90 series user manual
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