How Do I Send A Long Sms Exceeding 160 Characters Using At Command?

Question

1.00/5 (1 vote)

See more:

i'm sending SMS using AT commands in Text mode, its works fine but there is a problem in characters.... i m not able to send sms more than 160 character at one sms.

Please tell me how do i send a long sms exceeding 160 characters using AT command (Dongle).

Thanks in advance.

Posted 19-May-15 21:14pm

Mohamed Farhan

Add a Solution

Comments

Richard MacCutchan 20-May-15 3:36am

Send it as multiple messages of 160 or less.

Mohamed Farhan 20-May-15 7:01am

Hi Richard, I don't know how to send it as multipart message can you post the code please...

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

OriginalGriff · Answer 1 · 2015-05-19T22:40:00

Solution 1

160 characters is the limit for a single SMS - that's what the first "S" stands for: "Short Messaging Service".

To send longer messages, you need to break them into multiple messages, all shorter than 160 characters.

Posted 19-May-15 22:40pm

OriginalGriff

Frankie-C · Answer 2 · 2015-05-19T23:48:00

Solution 2

There is already an answer[^] about the issue.
Anyway to send multipart SMS you have to use the PDU mode[^].
A sample for multipart PDU is here[^] where they show you how to add an UDH (User Data Header) to send a multipart message in PDU mode.
There are a lot of online PDU encoders just google[^].
There is an excellent article wiith code for a library[^] on codeproject.

Posted 19-May-15 23:48pm

Frankie-C

Updated 20-May-15 3:36am

v3

Comments

Mohamed Farhan 20-May-15 6:59am

I have already tried but no success... Can you post a multipart message in PDU mode coding and explain it.. thank for reply my question....

Frankie-C 20-May-15 7:31am

Have you read the whole serie of articles in the site whose link I attached?
This page [http://mobiletidings.com/2009/02/11/more-on-the-sms-pdu] details very well the PDU, phone number encoding, 7 bits gsm encoding etc.

Mohamed Farhan 20-May-15 9:23am

I Red this article and got a good knowledge.... but error... where to attached the pdu
AT+CMGS=24<crlf>
> 0001000B915121551532F400000CC8F79D9C07E54F61363B04<ctrl-z>

What Does Value??? Send me example of Message using PDU code please...

Frankie-C 20-May-15 9:37am

I updated the solution with a library link and some other usefull links.
If it's ok for you accept the answer.

Mohamed Farhan 20-May-15 10:41am

First Link Sample PDU Not Working....

This is my text base code
public bool sendSms(string cellNo, string sms)
{
string messages = null;
messages = sms;

if (this.serialPort.IsOpen == true)
{
try
{
this.serialPort.WriteLine("AT" + (char)(13));
Thread.Sleep(4);
this.serialPort.WriteLine("AT+CMGF=1" + (char)(13));
Thread.Sleep(5);
this.serialPort.WriteLine("AT+CMGS=\"" + cellNo + "\"");
Thread.Sleep(10);
this.serialPort.WriteLine(messages + (char)(26));
}
catch (Exception ex)
{
MessageBox.Show(ex.Source);
}
return true;
}
else
return false;
}

I Need this pdu please help me...

Mohamed Farhan 20-May-15 10:42am

The above coding working fine problem is more than 160 Characters. Please help me...
Thank you...