Tcp Client Characteristics; Udp Server Characteristics; Udp Client Characteristics; Special Function - Ebyte E70-DTU User Manual

Star Network Modem
(2) It is usually used for communication with TCP clients in the LAN. Suitable for scenarios where there is no server in
the LAN and there are many computers or cellphones requesting data from the server. There is difference between connection
and disconnection like TCP Client to ensure the reliable exchange of data.
(3) When the E70-DTU(433NW30-ETH) 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.

4.2 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 E70-DTU(433NW30-ETH) 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 E70-DTU(433NW30-ETH) is set to static IP, please keep the E70-DTU(433NW30-ETH) IP
and gateway in the same network segment and set the gateway IP correctly, otherwise it cannot communicate normally.

4.3 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.

4.4 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 E70-DTU(433NW30-ETH) 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 E70-DTU(433NW30-ETH).
(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,E70-DTU(433NW30-ETH) supports broadcast within the supporting network
segment, such as the mode of xxx.xxx.xxx.255.

5. Special function

5.1 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
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