SIM7600 very slow with ftp upload

Using Arduino Networking, Protocols, and Devices
1

Hi,

i'm testing the chip sim7600 of dfrobot. It is connected to an arduino Uno. Everything is ok until now, but I have a problem when I want to upload data to a ftp server (ovh server):
The command "AT+CFTPSPUT="test.txt",10" with 10 bytes of data (ex "0123456789") returns immediately "OK", but I have to wait 9 seconds (!) to get the confirmation "AT+CFTPSPUT:0"
It's impossible to send other data before this message is returned.
The connection to the server seems good (ping 64ms).
I made some tests with http protocol and ThingSpeak server. Everything was ok.

AT+CFTPSLOGIN="ftp.cluster030.hosting.ovh.net",21,"","",0
OK
+CFTPSLOGIN: 0
AT+CFTPSPUT="test.txt",10

0123456789
OK
[[[ >>>>> 9 seconds <<<<< ]]]
+CFTPSPUT: 0
AT+CFTPSLOGOUT
OK
+CFTPSLOGOUT: 0

Any idea that could explain the delay of 9 seconds ?
Thanks.

2

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