Ebyte E90-DTU User Manual page 16

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Send: +++(no wrap)
Send: AT+VER(with auto wrap)
Return: +OK=E840-DTU(4G-02)_V1.0
Send: AT+SOCK=TCPC,116.62.42.192,31687
SOCK0 will connect to (the parameter here is the Ebyte test server, it is not recommended for users)
Return: +OK
Send: AT+LINKSTA
Return: +OK=Connect
Send: AT+POTOCOL=ON
Return: +OK
Send: AT+POTOCOL
Return: +OK=ON
Send: AT+REBT
Return: +OK
After the module is restarted, the SOCK will automatically establish a connection with the server. And when the
connection is successful, data can be transmitted to each other in the protocol mode.
6. Network function
(a) Registration packet: The registration packet is closed by default. The user can configure 4 types of registration
packet: send physical address (IMEI code) when connecting, send custom data when connecting, add physical
address when connection and at the head of each packet, add custom data when connection and at the head of each
packet. The custom registration packet has a maximum size of 40 bytes (it is 20 bytes when in HEX format).
(b) Heartbeat packet: In the idle state of network communication, the heartbeat packet is used for network state
maintenance. The heartbeat cycle can be set from 0 to 65535 seconds, and the maximum size of the heartbeat packet
is 40 bytes (it is 20 bytes when in HEX format). It supports two heartbeat types: network heartbeat and serial port
heartbeat. When the network heartbeat is selected, it starts timing from communication idle and sends heartbeat
packet to the server according to the configured heartbeat cycle. When serial port heartbeat is selected, it starts
timing from communication idle and sends heartbeat packet to the serial port according to the configured heartbeat
cycle.
(c) Clear the cache: Before the connection to the server is established, the data received by the serial port will be
cached. When the connection with the server is established, you can choose whether to clear the cached data. By
default, the clear cache is closed. The maximum size of each Socket in the local cache is 10 bytes, and each Socket
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// Enter AT command mode
// Read version information and enter AT command mode
// Query whether the SOCK has established a connection with the server.
// Open protocol transmission mode
// Query whether the protocol mode is open
// Restart
// Open SOCK0 and configure the network server parameters that
E90-DTU(900SL22-4G)Usermanual
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