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PICList Thread
'[EE] Dialup login to ISP help!'
2008\04\12@124123 by Carl Denk

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I have a PLC that would like to login in to my ISP and send an E-mail if
there is an alarm condition, like high water level of a sump pump. The
PLC can be programmed and communicates via RS-232 to a dialup modem on a
land line. With the PLC or a terminal software (Realterm) have no
problem dialing, connecting and getting the ISP login message ending
with "..User name:<sp>", but unable to get verified as a user, even
though the username and password are correct. Long conversation with ISP
(Windstream, used to be Alltel) India tech support didn't help, they
know nothing of the login protocol and format.

Using a RS-232 Spy software (Free Serial Port Monitor) I am able to
catch the Windows XP Dialer conversation which is able to logon
successfully reliably. Several runs of logging on seems to indicated
that the conversation is consistent with exactly the same strings of
characters each time, ruling out noise. The following is the
conversation after the "..User name:<sp>" and through my username and
password being sent out. I have changed my username and password to
protect the innocent. The password follows the 07h after the username
(E-mail address).

|Port opened by process "svchost.exe" (PID: 1408)|

|*Request: 4/12/2008 10:04:27 AM.56364 (+0.2813 seconds)*|

| ||7E FF 7D 23 C0 21 7D 21 7D 20 7D 20 7D 37 7D 22   ~ÿ}#À!}!} } }7}"|
| ||7D 26 7D 20 7D 20 7D 20 7D 20 7D 25 7D 26 4F 6C   }&} } } } }%}&Ol|
| ||5C C2 7D 27 7D 22 7D 28 7D 22 7D 2D 7D 23 7D 26   \Â}'}"}(}"}-}#}&|
| ||78 7A 7E                                          xz~             |

|*Answer: 4/12/2008 10:04:27 AM.75164 (+0.1875 seconds)*|

| ||7E FF 7D 23 C0 21 7D 21 F1 7D 20 7D 38 7D 22 7D   ~ÿ}#À!}!ñ} }8}"}|
| ||26 7D 20 7D 2A 7D 20 7D 20 7D 23 7D 24 C0 23 7D   &} }*} } }#}$À#}|
| ||25 7D 26 3D 66 A9 2C 7D 27 7D 22 7D 28 7D 22 7F   %}&=f©,}'}"}(}"|
| ||56 7E 7E FF 7D 23 C0 21 7D 24 7D 20 7D 20 7D 27   V~~ÿ}#À!}$} } }'|
| ||7D 2D 7D 23 7D 26 AD 36 7E                        }-}#}&­6~       |

|*Request: 4/12/2008 10:04:27 AM.86064 (+0.0313 seconds)*|

| ||7E FF 7D 23 C0 21 7D 22 F1 7D 20 7D 38 7D 22 7D   ~ÿ}#À!}"ñ} }8}"}|
| ||26 7D 20 7D 2A 7D 20 7D 20 7D 23 7D 24 C0 23 7D   &} }*} } }#}$À#}|
| ||25 7D 26 3D 66 A9 2C 7D 27 7D 22 7D 28 7D 22 B3   %}&=f©,}'}"}(}"³|
| ||BB 7E 7E FF 7D 23 C0 21 7D 21 7D 21 7D 20 7D 34   »~~ÿ}#À!}!}!} }4|
| ||7D 22 7D 26 7D 20 7D 20 7D 20 7D 20 7D 25 7D 26   }"}&} } } } }%}&|
| ||4F 6C 5C C2 7D 27 7D 22 7D 28 7D 22 7D 39 FC 7E   Ol\Â}'}"}(}"}9ü~|

|*Answer: 4/12/2008 10:04:28 AM.06364 (+0.1563 seconds)*|

| ||7E FF 03 C0 21 02 01 00 14 02 06 00 00 00 00 05   ~ÿ.À!...........|
| ||06 4F 6C 5C C2 07 02 08 02 F2 95 7E               .Ol\Â....ò•~    |

|*Request: 4/12/2008 10:04:28 AM.12664 (+0.0313 seconds)*|

| ||7E C0 21 0C 02 00 12 4F 6C 5C C2 4D 53 52 41 53   ~À!....Ol\ÂMSRAS|
| ||56 35 2E 31 30 F1 17 7E 7E C0 21 0C 03 00 17 4F   V5.10ñ.~~À!....O|
| ||6C 5C C2 4D 53 52 41 53 2D 30 2D 44 36 39 35 2D   l\ÂMSRAS-0-D695-|
| ||4C 54 47 4F 7E 7E C0 23 01 01 00 1D 10 58 58 58   LTGO~~À#.....XXX|
| ||58 58 58 58 58 58 58 58 58 2E 58 58 58 07 58 58   spam_OUTXXTakeThisOuTspamalltel.net.XX|
| ||58 58 58 58 58 01 12 7E                           XXXXX..~        |

|*Answer: 4/12/2008 10:04:28 AM.43864 (+0.2500 seconds)*|

| ||7E FF 03 C0 23 02 01 00 05 00 8B 3B 7E            ~ÿ.À#.....‹;~  
-----------------------------

1:Can someone explain what's happening with the conversation
between the request and sending the user name?
2: Looks like some kind of encryption? Sending what info?
3: I would rather not program the PLC for all this garbage,
is there a work around?
|




2008\04\12@125646 by piclist

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On Sat, 12 Apr 2008, Carl Denk wrote:
> 1:Can someone explain what's happening with the conversation
> between the request and sending the user name?
> 2: Looks like some kind of encryption? Sending what info?
> 3: I would rather not program the PLC for all this garbage,
> is there a work around?

Does this PLC have TCP/IP support?  Your ISP is most likely using a
protocol called PPP which is meant to transfer raw packets over a serial
connection.

What sort of options does your PLC have for networking?  I know some have
ethernet but not sure about dial up internet support.

--
Ian Smith

2008\04\12@150013 by Carl Denk

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Thanks for the quick reply.

The PLC does have TCP/IP support I think, but would need an adapter to
get to ethernet or leaving a PC along with the DSL running while we are
vacation. The PLC communicates for programming, online monitoring, and
control via RS-232. I was preferring something a little more straight
forward, like just a modem hooked to the phone line, and when there was
an alarm condition, like a failed sump pump, the cell phone or
daughter's land line would get the E-mail. The PLC also has RS-485 for
communications to other items including a PIC18F1320 reporting natural
gas well items, and future house HVAC zone thermostats/humidistats.

The PLC is easy to program in a version of BASIC where just use a "PRINT
#1" command.

.....piclistKILLspamspam@spam@ian.org wrote:
{Quote hidden}

2008\04\12@154924 by Dave Wheeler

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Hi Carl,

For this application, I'm not sure if email is the best way. I would
just buy a cheep (old) Nokia mobile phone and a pay-as-you-go SIM.
Then just send SMS, in the UK you can also SMS landlines.

EPE Magazine did a alarm signalling unit last year (I think, might have
been longer ago) with various inputs sending different SMS

Good Luck,

Dave

Carl Denk wrote:
{Quote hidden}

2008\04\12@161046 by Bob Axtell

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Dave Wheeler wrote:
{Quote hidden}

I have successfully used a cellular modem module. It is about 2"x2"x0.5"
and interfaces to an RS232
serial port. It sends data to an ISP address. Very simple and easy to
use. Vetrizon is the provider of
choice in the USA.

Google for "cellular modem", there are several.

--Bob A

2008\04\12@163650 by Carl Denk

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Thanks more for the replies, keep them coming. :)

Did some Googling for SMS and Nokia. The little I read seemed to
indicate that the Nokia wants to be hooked to a PC. If I was going to
leave a PC up while on vacation, then I could send the E-mail via the
PC, leaving the DSL up also.

And from Bob Axtell, I did google for cell modems, and found several in
the $500+ range, that's far out of range.

In our semi-rural area, cell service isn't the greatest. Recently AT&T
put up a low tower 1.5 miles away. It helped a little. Land line service
is more dependable. I have no problem dialing the modem with the PLC,
just the issue of connecting to the network. Once there, it seems like
SMTP should work I think. No additional equipment (I have a couple of
modems laying around) and no additional charges for service. The land
line terminal is right next to the PLC. This is in the basement, which
doesn't help cell reception. Our cell phone has E-mail and web, plus
being able to send messages to more than one is nice.

Longer term down the road, I's like to be able to send the PLC some very
basic info, like acknowledging the message, where if not received by the
PLC, would after a delay would E-mail next on the list.

Dave Wheeler wrote:
{Quote hidden}

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