Ebyte E90-DTU(433L30E) User Manual page 9

E90-DTU(Ethernet) wireless transceiver
connection and disconnection like TCP Client to ensure the reliable exchange of data.
(3) When the E90-DTU is a TCP Server, it can connect at most six clients, the local port number is a fixed value and
cannot be set to 0.
5.2 TCP Client characteristics
(1) TCP Client provides Client connectivity for TCP network services. Proactively initiates connection requests to the
server and establishes connections for the interaction of serial data and server data. According to the relevant TCP protocol,
there is difference between connection and disconnection to ensure the reliable exchange of data. It is normally used for
data exchange between devices and servers and it is the most commonly used networking communication method.
(2) In TCP Client mode, when the E90-DTU attempts to connect to the server and the local port is 0, it initiates a
connection with a random port each time.
(3) This mode supports short connection function。
(4) In the same LAN, if the E90-DTU is set to static IP, please keep the E90-DTU IP and gateway in the same network
segment and set the gateway IP correctly, otherwise it cannot communicate normally.
5.3 UDP Server characteristics
(1) UDP Server means that the source IP address is not verified on the basis of normal UDP. After each UDP packet is
received, the target IP is changed to the data source IP and port number, when the data is transmitted, it will be sent to the IP
and port number which was the nearest communication one.
(2) This mode is normally used for multiple network devices which need to communicate with the module, and do not
want to use TCP's data transmission due to fast speed and frequency.
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Figure 4 TCP Client
Figure 7 UDP Server
E90 series user manual
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