Does KFTPCLOSE correctly close FTP connection?

IoT Modules Legacy HL Series
1

Hi,
It seems that calling AT+KFTPCLOSE in HL7692 doesn’t send QUIT command over FTP Connection, and the ftp-server keep connection “alive” until timeout.

AT+KFTPCFG=1,“x.y.z.q”,“vXXX”,“vXXXa”,“3340”,1
+KFTPCFG: 1
…recv or send something
AT+KFTPCLOSE=1,0
OK

Modem Information:
AT+GMM
HL7692
AT+GMR
RHL769x.2.26.180400.201802141030.x7120m_1

2

do you see the control channel of FTP (on port 3340 in your case)is closed after AT+KFTPCLOSE?

4

No it isn’t closed. I look at FTP server log and QUIT command is never received

5

does latest FW 2.27 have problem?

https://source.sierrawireless.com/resources/airprime/software/hl7692-firmware/#sthash.HepkauHF.dpbs

6

Sincerely I don’t know, my modules are now all soldered and I can’t easily upgrade

7

you don’t have USB port?

Can you also install wireshark in your FTP server to see if the TCP connection on port 3340 is closed after the command?

8

No :frowning:
Is there a changelog for 2.27?

9

Can you also install wireshark in your FTP server to see if the TCP connection on port 3340 is closed after the command?

10

Yes I can, tomorrow I will try

Thank you

11

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Not only the connection is not closed sending QUIT command after AT+KFTPCLOSE, but
the modem continue sending NOOP command every 2 minutes for 10 minutes.

After 10 minutes from successful transfer the QUIT command arrives to the FTP server

12

When did you type at+kftpclose?

13

After 37.0 second from the session beginning (just after the transfer complete)

14

how about using the following? Is it same behavior?

AT+KFTPCLOSE=1,1
AT+ KFTPCFGDEL=1

If + KFTPCFGDEL is successfully, according to the AT command user guide, the connection should be closed.

15

Just tried, nothing changed. The connection remains open even after AT+ KFTPCFGDEL=1

16

how about AT+KCNXDOWN=1,1

17

I can see the TCP connection is closed after +KFTPCLOSE.

AT+KCNXCFG=1,“GPRS”,“internet”
OK
AT+KFTPCFG=1,“xxx.xxx.xxx.xxx”,“username”,“password”,21,1
+KFTPCFG: 1

OK

+KCNX_IND: 1,4,1

+KCNX_IND: 1,1,0

+KFTP_IND: 1,1
AT+KFTPRCV=1,"",“2222.txt”
CONNECT
2222–EOF–Pattern–
OK

+KFTP_IND: 1,2,4
AT+KFTPCLOSE=1
OK

+KCNX_IND: 1,5,30

+KCNX_IND: 1,0,0
ati3
RHL769x.2.24.173100.201709051100.x7120m_1

OK
ati9
RHL769x.2.24.173100.201709051100.x7120m_1
HL7692
HL769x.2.24
x7120m
FUSED
2017-09-05 11:32:03
r10943

OK

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