Reopening TCP server on the same port, TCP proxy (Serial LTE modem)

[Jaroslav Havel]

Dear Nordic company,

                                   I am writting to you in order to discuse some trouble with TCP server that I am trying run on Serial LTE modem application.

I am able to create TCP server (after entering APN usign AT+CGDCONT command, AT+CEREG=5 and AT+CFUN=1) with AT#XTCPSVR command.

If i close server with command

AT#XTCPSVR=0,XYZW 

OK

I am not able to open server on the same port again.

AT#XTCPSVR=1,XYZW 

ERROR

But if I try open server on another port, it works.

AT#XTCPSVR=1,XYZK 

OK

I try to logg isue and i know  I am not able to use listen() function.

I tried to fix it with using AT+CFUN=0 and AT+CFUN=1, but this doesn't help me. I tried to shut down net_if via net_if library, it doesn't work. Only way how fix it is use reset. I tried AT%XFACTORYRESET command, but it doesn't help too.

Could you please help me find way how to reopen server on the same port without reset of nrf9151?

Kind regards

Jaroslav Havel

[Øyvind]

Hello Jaroslav, 

Are you able to provide more details on which version of the Serial LTE Modem you are using? I.e. nRF Connect SDK version

Can you also please provide the full application log from startup, showing the steps you are taking?

Thank you.

Kind regards,
Øyvind

[Jaroslav Havel]

> AT+CGDCONT=1,IP,iot.1nce.net

OK
> AT+CEREG=5

OK
> AT+CFUN=1

OK

+CEREG: 2,"0655","081EAD01",7

+CEREG: 5,"0655","081EAD01",7,,,"11100000","11100000"
> AT#XTCPSVR=1,6500

#XTCPSVR CLIENT 1: 0,"started"

#XTCPSVR CLIENT 2: 0,"started"

#XTCPSVR CLIENT 3: 0,"started"

#XTCPSVR CLIENT 4: 0,"started"

#XTCPSVR CLIENT 5: 0,"started"

#XTCPSVR CLIENT 6: 0,"started"

#XTCPSVR CLIENT 7: 0,"started"

#XTCPSVR CLIENT 8: 0,"started"

#XTCPSVR CLIENT 9: 0,"started"

#XTCPSVR CLIENT 10: 0,"started"

OK
> AT#XTCPSVR=0,6500

OK
> AT#XTCPSVR=1,6500

 NEDAŘÍ SE POSLOUCHAT 

#XTCPSVR se nepodarilo spustit

ERROR

00> *** Booting nRF Connect SDK v2.7.0-5cb85570ca43 ***
00> *** Using Zephyr OS v3.6.99-100befc70c74 ***
00> [00:00:00.256,042] <inf> at_cmd_custom: Custom AT commands enabled with 79 entries.
00> [00:00:00.262,145] <inf> fs_nvs: 2 Sectors of 4096 bytes
00> [00:00:00.262,176] <inf> fs_nvs: alloc wra: 0, fe8
00> [00:00:00.262,176] <inf> fs_nvs: data wra: 0, 0
00> [00:00:00.526,977] <inf> slm: lib_modem init: 0
00> [00:00:00.527,038] <inf> mcuboot_util: Image index: 0, Swap type: none
00> [00:00:00.527,038] <inf> slm: Serial LTE Modem
00> [00:00:00.620,483] <inf> slm_uart_handler: UART baud: 115200 d/p/s-bits: 3/0/1 HWFC: 1
00> [00:00:00.620,605] <inf> slm_at_host: at_host init done
00> [00:02:06.398,498] <err> slm_tcp: listen() failed: -112
00> [00:02:06.404,968] <err> slm_at_host: AT command failed: -22

Kind regards

Jardoslv Havel