Hi,
I have a Gsm connection with static ip and I configured the Sim800l as ftp server but I'm having problems.
This is what happens on FTP with FileZilla:
the system opens listener on port 21;
FileZilla successfully connects to the system;
the opening of another port (passive mode) is requested to receive the data contained in the workbook, the system: stop the listener on port 21 start the listener on another port tells FileZilla the connection port and waits for the connection request;
FileZilla sends the LIST command and the system responds correctly with the list of files/folders.
At this point the listener on port 21 should be restarted, but the module always replies with "SERVER ERROR".
I've tried various ways, but I can't find a workaround to the problem, I'm trying to understand the problem but I can't see any solutions.
In client mode it works.
Some idea?
Thank you