click twice to send SMS from VB.net using AT command

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1.The below written codes works only if the button is clicked twice.
2.The message is send along with AT command and phonenumber. eg."AT+CMGS"9430011111" hii there!!!

Imports System.IO.Ports

Public Class Form1
    Shared _Continue As Boolean = False
    Shared _ContSMS As Boolean = False

    Dim SerialPort1 As New System.IO.Ports.SerialPort()
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

        SerialPort1.PortName = "COM3"
        SerialPort1.BaudRate = 115200
        SerialPort1.Parity = Parity.None
        SerialPort1.StopBits = StopBits.One
        SerialPort1.DataBits = 8
        SerialPort1.Handshake = Handshake.RequestToSend
        SerialPort1.DtrEnable = True
        SerialPort1.RtsEnable = True

        SerialPort1.NewLine = vbCrLf

        SerialPort1.Open()
    End Sub

    Public Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click


        If SerialPort1.IsOpen() Then
           


            
            SerialPort1.Write("AT+CMGS=" & """" & "9430011111" & """" & vbCrLf &"hii there!!!" & Chr(26))
            
        End If



       

    End Sub



End Class

Posted 10-Nov-11 17:45pm

Member 8327420

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lovehacker · Answer 1 · 2012-01-18T05:31:00

have you've tried send AT command using the hypertermal? as i noticed you need two user action to send sms using hypertermal.. which is AT+CMGS="desired number"(first user action) then type a message then press CTRL+Z to send it... so this is what happen to your button action... the first click was to send the command AT+CMGS and the second click was for the CTRL+Z to send it...

1 more thing when you receive the message the at command was include into the sent message... here is my answer code to your problem...

VB

SerialPort1.WriteLine("AT+CMGS=" & """" & "09103434639" & """" & vbCrLf)
            SerialPort1.WriteLine("hii there!!!" & Chr(26))

cheers....
paperjam,ph

Ashok19r91d · Answer 2 · 2011-11-13T22:28:00

Solution 1

Use SerialPort1.WriteLine instead of SerialPort1.Write

Posted 13-Nov-11 22:28pm

Ashok19r91d

SOHAM_GANDHI · Answer 3 · 2014-02-08T02:29:00

Solution 3

SerialPort1.WriteLine("AT+CMGS=" + Chr(26) + "09103434639" & + Chr(26)+& vbCrLf)
SerialPort1.WriteLine("hii there!!!" & Chr(26))
Thread.wait(500)

Posted 8-Feb-14 2:29am

SOHAM_GANDHI

Member 10661620 · Answer 4 · 2014-11-11T18:34:00

Solution 4

separate the part for settig receivrr contact and the message and in between include a delay of 3 seconds .by doing that u will even avoid sending the commands as part of message. can contact for a sample in this email fchege20@yahoo.com

Posted 11-Nov-14 18:34pm

Member 10661620