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4. Notes
1. The Socket link of this device will always be opened. After the initialization is successful, it will automatically
establish a connection with the configured network server.
2. After the device is powered on, it cannot be initialized successfully. That is, the "state" indicator has no indication for
more than 30 seconds. In this case, check whether the module is installed properly, whether the SIM card is properly
inserted, and whether the SIM has been invalid.
3. The short connection feature can be used to reduce the connection pressure of multiple devices to the server. After the
short connection function is enabled (AT+SHORTM>2), when the network or serial port has no data for more than the
short connection setting cycle, the device will actively disconnect the connection. After disconnection, the network
cannot send data. When the serial port sends valid data, the device will immediately establish a connection with the
server. If the local clear cache function is turned off, the current packet will be cached (up to 10K bytes). After the
connection is successful, the data will be sent to the server. If the clear local cache function is enabled, the packet will be
discarded.
4. The heartbeat function is used to maintain the state after the device and the server are successfully connected. Because
if the client and the network server successfully establish a connection and there is no data transmission for a long time,
the Socket link may be "dead", that is, the link exists, but cannot send or receive data. Therefore, in actual use, it is
recommended to enable the heartbeat packet function to ensure the reliability of the network link.
5. In actual use, it is normal that there is different data delay of two communications.
6. When the device serial port outputs the words "pdp error, device will be reset!", it indicates that the PDP context is
disabled by the network. Maybe the SIM card is loose or the current network channel is occupied abnormally.
5．Important Statement
1. Ebyte reserves the right of final interpretation and modification of all the contents of this manual.
2. As the hardware and software products continuously improving, this manual may subject to change without notice,
please refer to the latest version.
3. Everyone is responsible for protecting the environment: to reduce the use of paper, we only provide electronic
documents of the English manual, if necessary, please go to our official website to download.
6．Revision history
Version
Date
1.1
2019-05-30
1.2
2019-07-05
Copyright ©2012–2019, Chengdu Ebyte Electronic Technology Co.,Ltd.
Specification
Initial version
Revised version
E840-TTL-NB03 User Manual
Issued by
Blue
Lyl
18
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