![]() ![]() SMSPort.WriteLine(MyMessage & amp Chr(26)) & #39 LF notreqd. & #39 SMSPort.WriteLine(MyMessage & amp vbCrLf & amp Chr(26)) & #39 insert delay time (1000) below each comand AT command SMSPort.WriteLine(& quot AT+CMGS=& quot & amp Chr(34) & amp CellNumber & amp Chr(34) & amp vbCr) Quotes char are required to enclose CellNumber SMSPort.WriteLine(& quot AT+CMGS=& quot & amp CellNumber & amp vbCr) The corrected code is written copy-paste below (may be Malformed by WEB-prog).Pl correct code as per above instruction 1 & 2 Quotes char chr(34) are required before & after CellNumberĢ. I could not send SMS but then I studied in detail and found solution/correction in code as underġ. 11 June, 2007 - Article edited and posted to the main article base.1 June, 2007 - Original version posted.Some provide sample code that can be used for programming custom applications. It differs from service provider to service provider. Here, it may be a non-standard protocol or over HTTP. Sending SMS via service provider is also similar to using a webservice. Sending SMS via service provider endpoints The Code Project sample is available at The Code Project. Here, the usage is very simple, as it is just consuming a webservice to send a number and message to a function. So, purchase SMS credits to send a limited number of SMS using a webservice. There are free ones that are not so reliable. There are lots of webservices and you should be able to find one by searching the web. Sending SMS via webservices, although not for real-time services, is a very cost-effective solution. SMSEngine.Close() Sending SMS via a webservice SMSPort.WriteLine( " AT+CMGS=" + CellNumber + " r") MyMessage = SMSMessage.Substring( 0, 160) If (SerialIn.Contains( " +CMGS:") = true) ![]() Public bool SendSMS( string CellNumber, string SMSMessage) SMSPort.Handshake = Handshake.RequestToSend Public event DataReceivedEventHandler DataReceived Public delegate void DataReceivedEventHandler( string Message) ![]() Public event SendingEventHandler Sending Public delegate void SendingEventHandler( bool Done) In a Windows application, follow the steps below: While creating the instance of the class, provide the port to which the modem is connected. The above class exposes three functions: Open, SendSMS and Close. IsOpen = False End If End Get End Property Public Sub Open() _Continue = True RaiseEvent Sending( True)Įnd If End While RaiseEvent DataReceived(SerialIn)Įnd If End While End Sub Public ReadOnly Property IsOpen() As Boolean Get If SMSPort.IsOpen = True Then _ContSMS = True End If If SerialIn.Contains( " +CMGS:") = True Then SMSPort.Read(RXBuffer, 0, SMSPort.ReadBufferSize) SMSPort.IsOpen = True) Then While SMSPort.BytesToRead 0 ReadThread = New Thread( AddressOf ReadPort)Įnd Sub Public Function SendSMS( ByVal CellNumber As String,īyVal SMSMessage As String) As Boolean Dim MyMessage As String = Nothing ' Check if Message Length 0) And ( Public Sub New( ByRef COMMPORT As String) Public Event DataReceived( ByVal Message As String) Shared _Continue As Boolean = False Shared _ContSMS As Boolean = False Private _Wait As Boolean = False Shared _ReadPort As Boolean = False Public Event Sending( ByVal Done As Boolean) Imports System.IO.PortsPublic Class SMSCOMMS If you are using VB.NET for coding the application, you can use the class shared by Jeanred. Copy and paste the code given below into the class.Add a new class file with the name SMSCOMMS.Create a new Windows application or Web Application.The connection settings explained are common for most GSM modems. Sample connection details of the Maestro 20/100 modem can be found here. Connect the modem to the computer according to the setup guide specified in the manual provided with the GSM modem.Understand the AT Command set required to communicate with the modem.First, find the best GSM modem that suits the needs.In contrast, sending SMS via GSM modem has a few additional steps to take care of. Sending SMS via a webservice or endpoints is simplest. ![]() Service provider demands a commitment of at least 100,000 SMS per month.
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