6Keepalive Function; 7Timeout Restart Function; 8Clearing The Cache Function; 9Link/ Data Transmission Indication - Ebyte E90-DTU User Manual

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Chengdu Ebyte Electronic Technology Co., Ltd

3.2.6KeepAlive function

Keep-Alive is the mechanism for detecting dead connections in a TCP connection. When the user does not send any data, the

"Keep-Alive" information is periodically sent on the TCP link to maintain the idle link, avoiding dead connections and consuming

unnecessary system resources. This setting is valid under TCP. Users can customize the Keep-Alive switch and other parameters.

keepalive parameter introduction：

time：

How many seconds after the TCP link does not receive data packet transmission to start the probe packet；

intv：

Time interval between the previous probe packet and the next probe packet；

probes ： The maximum number of probe failures. When the sniffing fails to this number, the TCP connection will be

disconnected.。

The timeout restart (no data restart) function is mainly used to ensure that the E90-DTU-(230SL22-ETH) works stably for a long

time. When the network port does not receive data for a long time, or the network does not receive data for a long time,

E90-DTU-( The 230SL22-ETH) will restart after the set time has elapsed to avoid anomalies affecting communication. The timeout

timeout can be set through the webpage. The normal working time of this function is set to 60~65535S, and the default value is 3600S.

0 is off, when the setting is out of range, it returns to the default value.

When the TCP connection is not established, the data received by the DTU will be placed in the buffer area. The

E90-DTU-(230SL22-ETH) receive buffer is 2Kbyte. When the TCP connection is established, the network cache data can be set or not

according to customer requirements.

The device has two buffer areas, which are the serial data buffer and the network data buffer. When the SOCKET clear cache

function is enabled, only the cache data of the relevant SOCKET link will be cleared, and the serial cache data will not be cleared.

Link indicates the status of the network connection. In TCP mode, when the network is not connected, the Link is off, and when

the connection is established, the Link is always on. The Link indicator is always on in UDP mode.

The other one is the data transmission indication, showing the transmission status of the DTU. When there is no data transmission

on the DTU, the data transmission indicator is off. When there is data transmission on the DTU, the flashing indicates that the period is

E90-DTU(400SL22-ETH) User Manual

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400sl22-eth