Thank you for your report. I'll fix it soon.

My library tries to find user data header in the short_message and it reports "Invalid DELIVER_SM packet" when UDH cannot be found. It is not problem in your code. This problem comes from SMSC side. Please ask them why they send ems_class = 0x40 (which means UDHI is enabled), but short_message field...

Dear araxno, SmppClient Demo has example method where concatenated messages are processed private void client_evDeliverSm(object sender, DeliverSm data) { if (data.SegmentNumber > 0) { AddMessageSegmentToCollector(data); string messageText = SmppClient.GetMessageText(data.UserDataPdu.ShortMessage, d...

Both DELIVER_SM packets have enabled UDHI (User-Data-Header-Indicator)
but actually short_message field does not contain user data header.

How did you receive such messages?

There are only "Sending Data:" lines, but I need "Received Data:" to analyze invalid packet.

Hi Raksa, Sorry, I'm so overloaded this time. But I try to solve your problem. I need "Received Data" from your log. Possible you disabled evReceiveData event in your code private void client_evReceiveData(object sender, byte[] data) { AddToLog("Received Data: "+ByteArrayToHexString(data)); } Can yo...

I think you are right.
I've improved PrepareSubmit method in version 2.6.2
Please test it.

fixed in version 2.6.2

I think SMSC allow you to connect only with one session.
Sometimes when you have some network problems SmppClient can be disconnected, but SMSC still believe that you are connected.
You have to wait 2-3 minutes when SMSC drops your session by timeout.

Hi,

Can you show us any log information?

You need to use SubmitMode.Payload Example: client.SubmitText( SubmitMode.Payload, byte.Parse(tbSrcAdrTON.Text), byte.Parse(tbSrcAdrNPI.Text), tbSrcAdr.Text, byte.Parse(tbDestAdrTON.Text), byte.Parse(tbDestAdrNPI.Text), tbDestAdr.Text, coding, tbSend.Text);

Did you try without AddressRange?

Please make sure that you attached to the event
client.evDeliverSm +=new ALT.SMS.SmppClient.DeliverSmEventHandler(client_evDeliverSm);

please try with method sometimes Dns.GetHostEntry returns No such host is known.

I'm promised to get obfuscator update in 1-2 weeks.