Emailing via Telnet cannot get prntln to send ":"

Projects Programming
1

Hi All,
I have managed to get my Arduino to email via Telnet but i am having problems getting a particular string to work... any help would be greatly appreciated.

The end result would be an email with the body something like this:
TempF : 86

Everytime I send this:
client.println("TempF : 86");
The email body is blank.

If I send this:
client.println("TempF 86");
the body contains TempF 86 - as expected.

I have several hours of research into this and simply cannot come up with the solution.
client.print does not appear to work... only println
client.println(byte(58)); will place the ":" on its own line... but it must all be together as shown above.
if I place the ":" in a variable the result is a blank email also.

BTW I am using the code found on the old board here:
http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1235534880/15

I have tried many things and am sure the answer will be simple... being a newbie to Arduino/C/telnet I am having some difficulty.
Any help is appreciated - Thanks in advance
Shane

2

Did you put a blank line in between the "head" part of the message and the body? That's the only thing that normally separates them, and if you put "Tempf: 86" in the header, most email clients will probably not display it...

3

westfw,
I think the answer to your question is yes...
Here is the code that i am using...

client.println("HELO itismeletschat"); /* say hello (statement after helo is needed but irrelevant)/
delay(wait); / wait for a response */

client.println("MAIL From: @**.com"); / identify sender, this should be the same as the smtp server you are using /
delay(wait); / wait for a response */

client.println("RCPT To: ****@gmail.com"); / identify recipient /
delay(wait); / wait for a response */

client.println("DATA");
delay(wait); /* wait for a response */

client.println("To: ****@gmail.com"); / identify recipient */

client.println("Subject: Arduino Mail!!"); /* insert subject */

/client.println("sID : 1 TempF : 32 TempC : 0 Humidity : 68"); / insert body */
client.println("TempF : 32");

client.println("."); /* end email */

client.println("QUIT"); /* terminate connection /
delay(wait); / wait for a response */

This will send an email to my account with the subject as expected but nothing in the body.

If i change the line in red (above) to client.println("TempF 32");
The body of the email contains "TempF 32"

BTW - the reason for the very specific formatting is that i am attempting to add records to a ZOHO Data Base and the required format is "ColumName : Data"
I am attempting to create an Internet Temperature and Humidity Logging Application with ZOHO as the preferred back end.

Thanks Shane

4

Quick Note:
sending the text "TempF : 32" from the Telnet command line works as expected.
Therefore I think Telnet can be ruled out as the issue.

  • Shane
5

I don't see the blank line. It should be like:

client.println("DATA");
delay(wait); /* wait for a response */

client.println("To: *****@gmail.com"); /* identify recipient */
client.println("Subject: Arduino Mail!!"); /* insert subject */

client.println("");  // Separate Mail Headers from message Body

/*client.println("sID : 1 TempF : 32 TempC : 0 Humidity : 68"); /* insert body */
client.println("TempF : 32");
                      
client.println("."); /* end email */
6

westfw,
:smiley: Thanks so much that was what i needed... just did not understand what was meant the first time by blank line.

If i may ask... is that documented somewhere that i missed or is it just one of those things you knew?

I also have one other question on the client.println syntax... it is related but not sure if I should ask now or start a new thread.
In the example of "TempF : 32" the 32 is a variable ... can you point me in the right direction for the syntax to print "TempF : " + variable ?

Thanks Again
Shane

7

westfw,
Ok... that blank line really did the trick!
Now the client.print is working also .... so i just did this

client.print("TempF : ");
client.println(TempF);

To get the results i needed in the body of the e-mail.
(That answers my second question above.)
I assume that telnet just needed to know where the header stopped and the body started.

Thanks Shane

8

I assume that telnet just needed to know where the header stopped and the body started.

It's more likely that the email DID contain the "TEMP:" line, but your mail client chose not to display it (most modern mail clients choose not to display non-standard header lines by default.)

Did you try looking at the messages with 'view raw source' or equivalent?

Telnet doesn't care (or even know) about header/body separation, and most mail server software will leave all the headers that it sees (and add some more.)

9

RFC 2822 is the definition of SMTP message format, and it specifies an empty line separating the headers from the body.

So two things to be aware of: the blank line between headers and body, and there is special handling for any line that starts with a ".". So make sure you have the empty line between headers and body, and don't start lines with a "." and you'll be fine :slight_smile:

10

"2822" ??!!

I feel old. "When I was a boy, we only had RFC733 !"

11

All,
Wanted to say thanks for your help!
This section of the project is now working even better than I had hoped
I am looking forward to the day when i know enough to help out.

Thanks Shane

12

westfw:
"When I was a boy, we only had RFC733 !"

You should see RFC 1149 for one of the oldest messaging protocols still being used :slight_smile: