SubmitSmResp resp = client.Submit(data);

if (resp.Header.Status == CommandStatus.ESME_ROK)
{
MessageBox.Show(resp.MessageId);
}
else
{
MessageBox.Show("Error");
}

You can use method SmppClient.SubmitText. It originates SUBMIT_SM packets and send them to SMSC. There are two modes to send concatenated messages, using short_message field and using optional TLV parameters. Try both SubmitMode and determine which mode is suitable to your SMSC.

Yes, you can get source code updates on request.
Use Contact Us form.

I have removed this functionality. You can download version 1.2.7.

Which timeout value do you mean?

SmppClient has two values where process sleeping and waiting for a while.

SmppClient.Timeout gets or sets the maximum time in milliseconds waiting for response from SMSC.

SmppClient.SubmitSpeed gets or sets the number of SUBMIT_SM packets per minute that can be ...

There are two events evReceiveData and evSendData where you can get transfered byte arrays.

Please try version 1.2.6

I'll do my best to implement this in the next release.
I'll add two new events evDeliverSmComplete and evDataSmComplete.

SmppClient sends DeliverSmResp packet after evDeliverSm event.
You did not receive SubmitSmResp because SMSC still waits DeliverSmResp.
Solution could be to add evDeliverSmComplete which will be raised after sending response packet.
What do you think?

SMPPCLIENT_RCVTIMEOUT error arises when SMSC did not response after 120 seconds. SmppClient has propery Timeout with default value 120 seconds.
Do you need to send concatenated message?
Which SubmitMode do you use? Payload or ShortMessage?
Try both. SMSC servers work different.
Can you send me the ...

Fixed in the version 1.2.5
http://www.inetlab.ru/Download/SmppClient_1.2.5.zip

byte[] SubmitSM.Serialize(SubmitSM submit)
SubmitSM SubmitSM.Deserialize(byte[] data)

in version 1.2.4 I have implemented SubmitSm object serialization methods.
Please check it.

You can use evDelivery or evData events to receive SM from SMSC.
Please check sample application souce code.

Sorry, it was my fault. I have uploaded correct assembly. Please download it again.

In AddressRange property you can use regular expressions.
I'm posting some examples from specification.

^1234
The ‘^’ char is used to represent “beginning with”, therefore ^1234 is interpreted as
MSISDNs beginning ...