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Tagge
Joined: 23 Aug 2005
Posts: 93
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| How to create an attachment file to a GPRS Email? |
 Posted: Sat Jul 11, 2009 7:19 pm |
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Hi, I would like to create an attachment to an GPRS Email, because the module, Telit, demands it if the data is larger than 1kb.
How could it be done? or can it be done? I suppose any kind of "file" will do as long it contents ascii chars? It would be nice if its an .txt mode and therefore been able to be opened with for ex notepad.
The "file" has of course to be made "on the fly" due to lack of memory in the PIC, a 10kb buffer isn't nice.
Or as my data is stored in an 2M flash ic on the board, maybe it can be saved in some "file" format? its also updated(added to) once an hour.
Anyway it has to be able to be referred to as an attachment file when sending the data.
| Code: |
AT#EMAILD=<da>,
<subj>,<att>
[,<filename>]
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My data is about 10k bytes.
I'm using PIC18F97J60 and an Telit module.
Any ideas?
thanks, tagge |
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bkamen
Joined: 07 Jan 2004
Posts: 1611
Location: Central Illinois, USA
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| Posted: Sun Jul 12, 2009 2:48 pm |
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This is really the wrong forum for this -- as you are asking "how do I construct an email message".
You should be reading http://www.ietf.org/rfc/rfc2821.txt
and then making sure to review your mime types.
I do this stuff in scripting languages under Unix all the time. It's pretty easy -- if you do the reading.
Cheers,
-Ben
_________________
Dazed and confused? I don't think so. Just "plain lost" will do. :D |
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Tagge
Joined: 23 Aug 2005
Posts: 93
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| Posted: Tue Jul 14, 2009 12:50 pm |
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Hi, no, the problem is not to create an e-mail, that is done "automatically" in the Telit module by AT commands. The problem is to make an ascii buffer that is recognized as an file? and therefore be able to be attached.
But I'm afraid it can be impossible.. so maybe I just have to be satisfied with the 1Kb of data that can be in the body, that at least works fine.
And admit that a 8-bit PIC isn't the right mcu to use in this sort of applications.
Maybe instead some sort of an linux kernel and a 32 bit mcu with a fat memory.
But thanks any way
/Tagge |
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bkamen
Joined: 07 Jan 2004
Posts: 1611
Location: Central Illinois, USA
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| Posted: Tue Jul 14, 2009 1:52 pm |
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are you trying to send binary data in the attachment that needs to be base64 encoded or just plain text?
If so, the mime headers for the email are easy... if the telit stuff doesn't do it up early (needs to be in the headers) then it's a problem.
So a > 1kb text attachment or straight binary (if supported upstream) is easy.
base64 encoding, not so nice on a PIC if large files are intended.
-Ben
_________________
Dazed and confused? I don't think so. Just "plain lost" will do. :D |
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Tagge
Joined: 23 Aug 2005
Posts: 93
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| Posted: Wed Jul 15, 2009 3:39 am |
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Hi, thanks,
Yes, I just want to send ascii chars as an textfile and as an attachement.
My problem is how to define a string or a buffer as a .txt file?
or .bin or any file.
/Tagge |
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Guest
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| Posted: Wed Jul 15, 2009 5:55 am |
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Hi
As I see it, it's not possible, you must have some kind of file system and you don't. If the Telit expect a plain text file to read from the Pearl I can't see how you want to handle this from a clean ram layout...? |
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bkamen
Joined: 07 Jan 2004
Posts: 1611
Location: Central Illinois, USA
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| Posted: Wed Jul 15, 2009 8:43 am |
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I don't know the delivery mechanism to telit, but in my TCL scripts, you declare the mime header and then just STDOUT all the stuff you want and then end it with the appropriate separator.
I'll supply some TCL code that acts as a document mailer. It's pretty easy to read... but it's not C. So I apologize. (it's also written for Sendmail in Unix) However, I think you'll still get the idea.. Sendmail can take an email in multiple methods. File, STDIN. One just has to construct it properly. (and maybe this is still even missing a few things. I wrote this about 8 years ago.)
Anyway - I hope it helps. You want only the stuff between my "look here" markers.
However change the
puts $ofh "--$boundary"
to
puts $ofh "--$boundary--" (See the 2 -'s on the end? they signify the end of the markers/mime attachments. IMPORTANT! :D
And $boundary can be anything as long as it's unique in the email. So make it a 40col mixed hex number. (could even be the same from one message to another. AS LONG AS IT'S UNIQUE IN IT'S OWN MESSAGE.)
I'm rambling. Sorry.
| Code: |
<====Look from here =====>
set timestamp [ clock seconds ]
set hextimestamp [ format "%X" $timestamp ]
set boundary "--$hextimestamp$hextimestamp$hextimestamp"
set ofh [open "|/usr/sbin/sendmail -t " w ]
puts $ofh "From: Ben (WebScript) <someemail@yourdomain.net>"
puts $ofh "X-Mailer: Ben's Web DocMailer version 1.0 (tcl; U; AIX 4.3)"
puts $ofh "MIME-Version: 1.0"
puts $ofh "To: $FormData(email)"
puts $ofh "Subject: Here's the file you requested, $FormData(file)"
puts $ofh "Content-Type: multipart/mixed; boundary=\"$boundary\""
puts $ofh ""
puts $ofh "This is a multi-part message in MIME format."
puts $ofh "--$boundary"
puts $ofh "Content-Type: text/plain; charset=us-ascii"
puts $ofh "Content-Transfer-Encoding: 7bit"
puts $ofh ""
puts $ofh " This message was sent automatically per your request"
puts $ofh " via the DocMailer system from my web site."
puts $ofh ""
puts $ofh " Need anything else? Email me at myemail@somedomain.net or"
puts $ofh " click back to http://www.benjammin.net"
puts $ofh ""
puts $ofh " - Ben"
puts $ofh ""
puts $ofh "--$boundary"
<====Look to here =====>
if { [ regexp {[.](.*)$} $FormData(file) ] } {
set ext "[file extension $FormData(file)]"
if { ! [ catch { open "$defaults(mimefile)" "r" } fh ] } {
while { [gets $fh mimedef] >=0 } {
regexp {^AddType[\t\s]+([.]\w+)[\t\s]+(.*/.*)[\t\s]+(\w+)[\t\s]+.*$} $mimedef junk fileExt mimeType encoding
if { [ regexp -- $ext $fileExt ] } {
break
}
}
}
} else {
if { ! [info exists $fileExt] } {
PrintMessage 5
exit
}
}
set filesize "[file size "$RootPath/$FormData(file)"]"
if { ! [ catch { open "$RootPath/$FormData(file)" "r" } fh ] } {
fconfigure $fh -translation binary
fconfigure $ofh -translation binary
set buffer [read $fh]
if { ! [ regexp "text" $mimeType ] } {
set buffer "[::base64::encode -maxlen 100 $buffer]"
set encoding "base64"
}
close $fh
} else {
puts stderr "DOCUMENT_URI = $env(DOCUMENT_URI)"
puts stderr "fullFileName = $FormData(file)"
puts stderr " Could not open file ($fh)"
puts "Could not open requested file... Sorry - Ask Ben!"
puts ""
exit
}
puts $ofh "Content-Type: $mimeType; name=\"$FormData(file)\""
puts $ofh "Content-Transfer-Encoding: $encoding"
puts $ofh "Content-Disposition: attachment; filename=\"$FormData(file)\"; size=\"${filesize}\""
puts $ofh "Content-Length: ${filesize}"
puts $ofh ""
puts -nonewline $ofh $buffer
flush $ofh
fconfigure $ofh -translation crlf
puts $ofh "--$boundary--"
puts $ofh "."
flush $ofh
close $ofh
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_________________
Dazed and confused? I don't think so. Just "plain lost" will do. :D |
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