This error indicates that the GSM modem does not give an acknowledgement that the message Diafaan SMS Server is sending is accepted by the mobile network and that the GSM modem also does not return an error code. Usually it is an indication that there is a (temporary) problem with the mobile connection between the GSM modem and the mobile network.
Sometimes the underlying cause is that the network signal quality is insufficient but it is also possible that there is a source of interference with the mobile signal or that the GSM modem module has problems staying connected to your mobile network because it is not 100% compatible.
It might help to use a different antenna, locate the GSM modem to another position with better network signal quality or to use a SIM card from another network. Other that that, there is not much you can do to solve this problem.
I am having a problem with one device (GSM Modem). I can send SMS from it, the number does not receives the SMS but send log appears an sent status and some time no any message sent and send log appears an error status (300, Error: Timeout error, no or unexpected response after GSM Modem send command.)
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