This is basically the same error. +CMS ERROR 500 means 'Unknown error' when trying to send the message. When the modem just returns 'ERROR', the cause of the error is also not specified by the GSM modem module.
The bottom line is that the modem just reports that the message could not be sent (or at least that the modem cannot confirm that the message is sent) but it does not give a specific reason why the error occurs.
What about this one "The GSM Modem returned ERROR after the 0791551218312800512C0D91551289610245F00008AA8C050003470501004C0065006D00620072006500740065002000530061006C00E3006F0020005100750061006C0069007400790020002D00530068006F007000700069006E00670020004D00610069006E0020005300740072006500650074003A000A0048006F006A006500200076006F006300EA002000740065006D00200055006E00680061002000640065 command."?
This error message, and your description of the problem, indicates that the GSM modem does not receive a confirmation that the message was received by the GSM network. Since the message is received on the mobile phone, the message is sent to the mobile network but apparently the GSM modem does not know it and generates the CMS ERROR 500.
The reason for this error is difficult to pinpoint but it usually has something to do with a GSM modem module that does not work well together with the GSM network, sometimes because the network strength is not sufficient but it also could be a faulty GSM modem module or a bad antenna connection.
Unfortunately, there is nothing in the settings of Diafaan SMS Server that can have an effect on this error.
The error message on the Events "The GSM Modem returned +CMS ERROR: 500 (Unknown error) after the 079155121831280051270D91551299792857F50008AA8C050003460501004C0065006D0062007200650074006500200050006F007200740075006700610048006100690072003A000A0048006F006A006500200076006F006300EA002000740065006D0020002F0043006F007200740065002000660065006D0069006E0069006E006F002000560049005000200063006F006D0020006500730063006F007600610020 command."
I am having a problem with one device (GSM Modem). I can send SMS from it, the number receives the SMS. But on the Send Log appears an error status (300, Error: Unknown error after PDU sent.).
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