Heartbeat Packet; Clear Cache; High Speed Mode - Ebyte E840-TTL-4G02E User Manual

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configured. ①Send physical address (IMEI code) when connecting. ②Send custom data when connecting. ③Add the

physical address before each packet when connecting. ④Add custom data before each packet when connecting. The

maximum length of the custom registration data packet is 40 bytes (with HEX format, the maximum length is 20 bytes).

4.2.3 Heartbeat packet

In idle state of network communication, heartbeat packets are used for network status maintenance. The heartbeat

cycle can be set from 0 to 65535 seconds, and the maximum length of the heartbeat packet is 40 bytes (when set to HEX

format, the maximum length is 20 bytes). Supports two heartbeat types: network heartbeat and serial heartbeat.

Network heartbeat: from the communication idle time, send heartbeat packets to the server according to the

configured heartbeat period.

Serial port heartbeat: from the communication idle, send heartbeat packets to the serial port according to the

configured heartbeat period.

Before connecting to the server, the data received by the serial port will be cashed. After connection, you can choose

to clear the cached data or not. By default, the cache will be cleared. The maximum size of each Socket in the local cache

is 10 bytes, and each Socket buffer is independent of each other.

The E840-TTL-4G02E is designed with a separate high-speed mode. In this mode, both the network and the device

can transmit any packet length data, such as file, picture, and video.

Configure/query the high-speed mode state through the AT+HSPEED command. After the high-speed mode is

enabled, the device can transmit any packet length data at 460800 serial port baud rate.

The E840-TTL-4G02E file transfer process will be demonstrated below:

Step 1. Turn on the high-speed mode: After the device enters the AT mode, send AT+HSPEED=ON to enable the

high-speed mode, configure the connected server address, and restart the device.

Step 2. Prepare files for transfer, RF_Setting_E90.exe. The file is an executable file. After startup, the following

interface is displayed:

E840-TTL-4G02E User Manual

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