Sending SMS to PDU mode GSM VB.NET

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Hi Members,

I am new in vb.net solution and I have a project which send a sms using smartbro plug in. It can send single and multiple message but it's only limited to 160 characters. Can anyone help me to check my code for me to send beyond 160 characters.

I read some forums to send SMS in PDU mode but it's very difficult to understand. Kindly see below code for your reference and comment. Hope someone who can help me.

What I have tried:

With SerialPort1
.WriteLine("AT" & vbCrLf)
Threading.Thread.Sleep(300)
.WriteLine("AT+CREG=1" & vbCrLf)
Threading.Thread.Sleep(300)
.Write("AT+CGREG=1" & vbCrLf)
Threading.Thread.Sleep(300)
.WriteLine("AT+CMGF=1" & vbCrLf)
Threading.Thread.Sleep(300)
.WriteLine("AT+CSMP=17,167,2,0" & vbCrLf)
Threading.Thread.Sleep(300)
.WriteLine("AT+CSCS=""GSM""" & vbCrLf)
Threading.Thread.Sleep(300)
.WriteLine("AT+CMGS=" & Chr(34) & txtNumber.Text & Chr(34) & vbCrLf)
Threading.Thread.Sleep(300)
.WriteLine(RichTextBox1.Text & Chr(26))
Threading.Thread.Sleep(300)
MsgBox(rcvdata.ToString)
End With
If rcvdata.ToString.Contains(">") Then
MessageBox.Show("Messsage is successfully sent!", "Sending SMS Information", MessageBoxButtons.OK, MessageBoxIcon.Information)
cmdSend.Enabled = False
txtNumber.Clear()
RichTextBox1.Clear()
txtNumber.Enabled = True

Posted 7-Dec-20 12:40pm

Member 15014775

Updated 18-Oct-21 3:21am

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Comments

Peter_in_2780 7-Dec-20 19:48pm

SMS stands for *SHORT* Message Service. An SMS message is limited to 160 characters (if entirely alphanumeric).

Member 15014775 7-Dec-20 23:04pm

Hi Sir Peter, thank you for your comment. Just to add, I downloaded a trial version of sms sender then I used the smart bro plugin and it can send more than 160 characters by setting the modem to PDU mode but I don't know how to do it. I read many articles and read forum about SMS sender but hardly understand. Hope somebody can help me.

Thanks in advance.

kgmmurugesh 8-Dec-20 7:17am

This is true.

Richard Deeming 8-Dec-20 5:20am

How about reading the documentation that came with your modem, or contacting the manufacturer's support team?

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