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SIM5218E FTP(S) passive data connection fail

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SIM5218 has no problem establishing connection to a FTP or FTPS server. Unfortunately, it cannot establish data connection once it has requested the server to enter passive mode to perform, LIST, GET and PUT commands.

The following commands,
AT+CFTPSLIST,
AT+CFTPSGETFILE,
AT+CFTPSPUTFILE

send PASV command to the FTPS server. Once the server reply with,

SENT: 227 Entering Passive Mode (x1,x2,x3,x4,p1,p2)

SIM5218 just freeze and fail to establish data connection to the server to complete the command.


Does anyone has any success with FTP operations with SIM5218?

Many thanks.
 

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