[Cialug] Python failing

[Patrick Mcgillan]

Reloaded the server with Debian 8 and sensor reading via USB is rock solid.
Not sure what went flaky on old server software.

Thanks for all the suggestions.


--
Patrick

On Thu, Jun 30, 2016 at 7:34 PM, Patrick Mcgillan <
patrick.mcgillan at gmail.com> wrote:

> This problem is on hold.
>
> Tried to load syslog-ng and got weird load errors. Tried a apt-get update
> and it had problems.
>
> Backed up my relevent files, then booted up the netinst cd for Debian.
> Gonna totally reload.
>
> Will report back in a day or so if this problem still persists.
>
> In short, the arduino uno never stops trying to send, but the tx flash
> when it sends is missing. The heartbeat on the uno continues its 1 a second
> flash, so the uno is running.
>
> Run the python program in a terminal and it randomly stops displaying
> data. The process is still running, but not sure to where. LOL
>
> Ctrl-c to stop python program, up-arrow and enter to restart. It starts
> right up and goes back to showing data in the terminal screen.
>
> Note also that the uno goes back to sending as the tx lt flickers every so
> often. 4 different messages and each is apprx 1 minute apart, so each
> minute, 4 messages are received by the uno and sent down the usb cable to
> the server.
>
> Couldn't find anything in any log program or journal about USB problems.
>
>
> --
> Patrick
>
> On Thu, Jun 30, 2016 at 12:33 PM, Sean Flattery <sean.r.flattery at gmail.com
> > wrote:
>
>> I agree with David, it looks like an issue with input from ttyUSB0.  Like
>> you, I'm no python expert but it appears that the script doesn't have code
>> to handle lack of input from your serial connection.  When your While True
>> statement turn to false, the program ends.  You could modify the code to
>> wait, or maybe hack up a workaround like a cron job to restart the python
>> code if it's no longer running.
>>
>> If journalctl doesn't have the logs you want, try installing and running
>> syslog-ng.
>>
>>
>>
>> Date: Thu, 30 Jun 2016 07:00:46 -0500
>> > From: Patrick Mcgillan <patrick.mcgillan at gmail.com>
>> > To: Central Iowa Linux Users Group <cialug at cialug.org>
>> > Subject: Re: [Cialug] Python failing
>> > Message-ID:
>> >         <CACQ_s3kSEFQgt9ZE85S2WknXKtwVQkh1QCS5mnpaLi-B=
>> > OTQGA at mail.gmail.com>
>> > Content-Type: text/plain; charset=UTF-8
>> >
>> > how interesting. there are no system logs. there is a dmesg log, but
>> > nothing in it past boot of course. the version is known as bbq, picked
>> for
>> > its small foot print. not been worth it and am thinking of switching
>> back
>> > to regular debian.
>> >
>> > I wonder if there is a missing package that could be loaded to restore
>> > normal runtime logs. cron works and until you asked i assumed logs were
>> > working, just never went and looked.
>> >
>> >
>> > --
>> > Patrick
>> >
>> > On Wed, Jun 29, 2016 at 11:42 PM, David Champion <dchamp1337 at gmail.com>
>> > wrote:
>> >
>> > > Do you see any system messages about ttyUSB0 having issues?
>> > >
>> > > -dc
>> > >
>> > > On Wed, Jun 29, 2016 at 7:44 PM, Patrick Mcgillan <
>> > > patrick.mcgillan at gmail.com> wrote:
>> > >
>> > > > The following script has been running fine for over a year. Now it
>> is
>> > > > stopping more than once a day. Kill program and restart and it again
>> > runs
>> > > > fine for a while. Any thoughts? I know enough about python to be
>> > > dangerous
>> > > > to myself. n arduino uno is sending messages to the server running
>> the
>> > > > capture script.
>> > > >
>> > > > Patrick
>> > > >
>> > > >
>> > > > #!/usr/bin/python
>> > > >
>> > > > import serial
>> > > >
>> > > > debug = 0
>> > > >
>> > > > MySerial = serial.Serial('/dev/ttyUSB0', 9600)
>> > > >
>> > > > while True:
>> > > > data = MySerial.readline();
>> > > > print "%s" % (data)
>> > > >
>> > > > if data.count(":") == 2: who,s1,s2 = data.split(":",3)
>> > > > if data.count(":") == 3: who,s1,s2,s3 = data.split(":",4)
>> > > > if data.count(":") == 4: who,s1,s2,s3,s4 = data.split(":",5)
>> > > > if data.count(":") == 5: who,s1,s2,s3,s4,s5 = data.split(":",6)
>> > > > if data.count(":") == 6: who,s1,s2,s3,s4,s5,s6 = data.split(":",7)
>> > > >
>> > > > if data.count(":") > 1:
>> > > > fileout = open ('/var/local/Sensor/' + who + '-Data.txt', 'a');
>> > > > fileout.write (data);
>> > > > fileout.close();
>> > > > if data.count(":") > 1:
>> > > > fileout = open ('/var/local/Sensor/' + who + '-Last.txt', 'w');
>> > > > fileout.write (data);
>> > > > fileout.close();
>> > > > _______________________________________________
>> >
>> >
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