Sending such a low amount of messages cannot cause any performance problems in Diafaan SMS Server. The most likely cause for delays and hang ups when you send the messages using a GSM modem is that the modem or mobile network generates a lot of send errors or that the modem has trouble connecting to the mobile network.
If you send the communication log for the modem and the event log to email@example.com, I will have a look to see if I can spot a problem. Please include the date and time when you see the hang up in the log.
I've had a look through the forum and have noticed some people having similar issues as me. We have been using diafaan server for a few years now and have been happy with the performance except the hanging of queued messages. This occurs when we send multiple SMS, the maximum we would send at any one time is between 300-500 messages. Maximum batch size is 10 with a delay of 3secs in between messages and it seems to make no difference. Can you offer any suggestions, I have an event log i can send you if it helps. My modem is a Huawei E173, hope this helps
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