Receiving SmppChannelException while the SMSC is still sending response

[MaximeKestemont]

Hi,

My test case is the following : I am trying to send 100 000 SubmitSM request to a production SMSC.
In some cases, this test will work correctly, and I will be able to send all the 100 000 sms, and receiving response from the server for each of them.

However, I have sometimes experienced failure, receiving a com.cloudhopper.smpp.type.SmppChannelException : Channel was closed after sending request, but before receiving response. The strange part is, even if the channel seems closed, I am still able to send request, see the request in the logs of the SMSC, which then send me back the response, which I do not receive.
It seems that I am thus still able to send requests to the SMSC, but not to receive anything.

My questions are :

• What could cause this ChannelException? I see nothing particular in the logs of the SMSC.
• Why I am still able to send request once the channel seems closed, but not receive any response?

Moreover, my quick fix was to unbind and destroy the session, then rebind myself when I encountered this exception. However, the connection was refused, so I had to wait a small period of time (10s) before trying the rebinding, which then worked correctly. Any hindsight on that problem?

Thanks !

[lospejos]

I faced the same error. My details:

1. Sending about 15 SMSs (not hundreds nor thousends);
2. My session example: 1 sent, 2 errors, then again 3 sent, 2 errors etc, i.e. without restarting or reconfiguring, errors and succeeded attempts are mixed;
3. cloudhopper-smpp version is 5.0.9

[Eeswar-Surya]

Year 2020. cloudhopper-smpp version is 5.0.8

1. Getting the Exception for 5 sms (neither hundreds nor thousands)
2. isBound returns true
3. EnquireLink returns SmppChannel Exception.