Telnet disconnect and need hard reset

[pchirouze]

Hello,
When my Wipy is connected with Wifi in mode VPA, Wipy disconnect after a time maybe the timeout and in my Telnet session receive "Connection closed by foreign host". The only way to restart Telnet is a hard reset on Wipy. Can someone explain and help to resolve this trouble.
Many thanks,

[daniel]

Hi Gabriel,

Thanks for the extra info. I'll go through a debugging session tomorrow and see what's going on...

Cheers,
Daniel

[gbozzi]

@daniel
Adding some info, even with a higher timeout I experience some issues with Server.

Reconnecting to an FTP session that has been closed or inactive from a while brings this:

ftp 10.25.0.165
Connected to 10.25.0.165.
220 Micropython FTP Server
Name (10.25.0.165:gabriele): 
331 
Password: 
230 
Remote system type is UNIX.
Using binary mode to transfer files.
ftp> cd flash/lib
250 
ftp> ls
425 
502 
150 

... (timeout to occur)

ftp: Poll timeout waiting before accept
502 

421 Service not available, remote server timed out. Connection closed.

During the session, the server is connected, from the TCP PoV:

tcp4       0      0  10.25.0.150.63805      10.25.0.165.ftp        ESTABLISHED

And Telnet works; however, a soft re-boot (CTRL-D) doesn't fix the FTP issue, I need to press the reset button.

[pchirouze]

Thanks for your quick reply. I seems better whith the version 1.8.2 now installed. Another remarks when the trouble happens the heartbit led comes and stay off. I have nothing read in the docs about heartbit state off. Is it a state without significant relation ?

Best regards,
Patrice.

[daniel]

Hi Gabrielle,

That's interesting. I'll look into it. Thanks!

Cheers,
Daniel

[gbozzi]

Hi,
It happens to me as well, new firmware installed.

Practical experience tells me that changing timeout of telnet server makes the trick, even exceeding server timeout.

import network
server = network.Server()
#Set timeout to 5 minutes
server.timeout(600)

You can include the mod in a boot.py file
https://micropython.org/resources/docs/en/latest/wipy/wipy/tutorial/reset.html

Now, this is a workaround, the issue might have to do on how wifi is managed at server level, further investigation would be needed.

[daniel]

@pchirouze The default timeout for Telnet and FTP (when there's no activity) is 120s. But you should be able to connect again without performing a hard reset. Check the Server class for details on how to change the timeout value:

https://docs.pycom.io/wipy/library/network.html?highlight=server#class-server

Cheers,
Daniel