Ebyte E90-DTU(433L30E) User Manual page 11

E90-DTU(Ethernet) wireless transceiver
Sending a registration packet when establishing a connection are mainly used to connect to a server that requires
registration. Data-carrying registration packets refers to accessing registration packets at the head of data in sending data,
which is mainly used for protocol transmission. The user-defined data packet defaults to hexadecimal data (ASCII code
optional) and the maximum packet length is 40 bytes.
6.3 Heartbeat mechanism
In the network transparent transmission mode, users can make the module send heartbeat packets to the server.
Heartbeat packets can be sent to the web server or sent to the serial device, they cannot run at the same time.
Network heartbeat pocket: The heartbeat packet is sent to the network, in the heartbeat transmission cycle, the module
sends heartbeat packet data to the network server to maintain the connection with the network server. It only runs in the TCP
Client and UDP Client modes。
Serial data packet: In the set heartbeat sending cycle, the module sends heartbeat packet data to the serial port, users
can do corresponding processing after the serial port receives the heartbeat data.
In an application in which a server sends a fixed inquiry command to a device, in order to reduce communication
traffic, users can choose to send a heartbeat packet (inquiry command) to the serial device side instead of sending a inquiry
command from the server.
User-defined data packet defaults to hexadecimal data (ASCII code optional), E90-DTU module supports custom
heartbeat packet content up to 40 bytes
Chengdu Ebyte Electronic Technology Co., Ltd.
Figure 8 Sending MAC when connecting
Figure 9 Sending user-defined data when connecting
Figure 10 Each packet of data sending MAC
Figure 11 Each packet of data sending user-defined data
E90 series user manual
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