in http://code.google.com/p/smslib/wiki/SMSServer_DB_Interface, the
description of gateway_id field in outbound sms table says:

"gateway_id, CHAR(64), NOT NULL, Default value is the star character" and
"Set it to the star character if you want to leave to SMSServer the
decision as to which gateway to use to send your message."

I always set the gateway_id of outbounding messages to '*' in my database
and never had a problem. But after I upgraded to v3.3.1, outbound messages
stopped working. Then I played around with the source codes for awhile and
found this in the preroute() function of org.smslib.routing.Router:

if (msg.getGatewayId().length() != 0)
{
    if (msg.getGatewayId().equalsIgnoreCase(gtw.getGatewayId()))
getCandidates().add(gtw);
}
else getCandidates().add(gtw);

In my case, since the value of msg.getGatewayId() is '*' and not equals to
any available gateway name, so that no gateway is added into the candidate
list. Thus failed to route the message.

Change the gateway_id field to "NOT NULL, Default value is empty string"
can solve this problem but the document should be updated as well. Maybe a
better solution is to change the above code to:

if (msg.getGatewayId().length() != 0)
{
    if (msg.getGatewayId().equals("*") ||
msg.getGatewayId().equalsIgnoreCase(gtw.getGatewayId()))
getCandidates().add(gtw);
}
else getCandidates().add(gtw);

Regards,
Zheng Yue