If the reception level is limit or unstable, the use of an offset antenna or a test with a different
mobile operator is recommended to improve the connection.
If the IP and DNS addresses are not displayed, there may be several causes:
• The APN has not been entered or is incorrect,
• If authentication is required, the login and/or password are incorrect.
As long as the problem persists, the concentrator will not be able to use the modem
to connect to the remote server. On the other hand, the text message commands
will function.
Servers:
• FTP server name
• FTP server authentication: login and password
• Interface to use: modem or Ethernet properly configured to access external devices
The text messages make it possible to issue some basic requests to launch the configuration
file retrieval on the FTP server. They are never a substitute for full FTP or web configuration.
FTP/SFTP
As indicated previously, this configuration method takes precedence over local configuration
using the web interface.
This operating mode requires an FTP or SFTP server accessible by the concentrator. This server
is accessible using an address, a login and a password.
The server can be hosted on any server type (Windows, Linux, etc.). What is important is that
its address is accessible by the concentrator using the configured network interface (Ethernet
or modem). Please note that Windows FTP servers are unable to manage the case in file
names. Therefore, to avoid all problems, it is recommended to only use Linux FTP servers.
The use of an SFTP server is preferable because of the extra security layers compared to a
classic FTP server. Otherwise, both types of servers operate in the same way.
3.1.1 Operating principle
FTP/SFTP configuration is based on a directory tree structure and files on an FTP/SFTP server.
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