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Number of data bytes already sent but not yet acknowledged at the TCP layer.
The value is constantly changing until the entire upload job has completed. If the value equals 0 all data sent so
far is acknowledged.
In binary mode, <unackData> includes the <cnfWriteLength> value of the pending write operation. There-
fore, the very first write operation of an upload job returns identical values for <cnfWriteLength> and
<unackData>.
This mechanism allows the host application to easily verify whether or not the remote host has successfully
received the data.
Parameter is not applicable to HTTP, POP3, SMTP and Socket UDP client. For these services the counter is
always set to 0.
1 The service is ready to accept new user data.
2 Data transfer has been finished successfully and Internet service may be
closed without loss of data.
Notes
•The AT^SISW write command must be terminated only with the ASCII character set with ATS3. The factory
default for S3 is #13 (Carriage Return). Do not send any further characters after the S3 end-of-line identifier,
until the response "^SISW" is received. This is necessary to avoid that any characters related to the AT com-
mand can be interpreted as being part of the data stream to be transferred. Also refer Section 1.4, AT Com-
mand Syntax.
• If the Socket service is configured for UDP and fixed size and the interactive text mode is active, the PDU
length always equals the specified fixed length. If the input characters exceed the specified fixed length, then
all surplus characters will be ignored. If the input characters are less than the specified fixed length, then the
remaining range will be filled with "\0" bytes.
10.8.1 Usage of parameter <eodFlag><unackData>(num)
<urcCauseId>(num)
Service type
Socket After the service accepts the end-of-data flag the service state changes to "Closing". No fur-
ther user data is accepted.
After releasing the TCP link the service remains in state "Down".
FTP Parameter only applicable for FTP upload session.
After accepting the end-of-data flag the service state changes to "Closing" and starts to end
the running FTP session.
No further user data is accepted.
After the FTP session is completed on FTP protocol level the service state switches to "Down".
In case of successful completion the URC "^SISW: x,2" is generated.
SMTP SMTP service sends some "closing" commands to the SMTP server which are necessary to
mark the email as successfully sent on the server. The service enters "Closing" state and
remains in it until the final protocol exchange with the SMTP server has been completed.
The "OK" response following AT^SISW indicates that the SMTP service has accepted the last
data - IT DOES NOT indicate the successful completion of the SMTP service.
Successful completion will be indicated either by the appropriate URC "^SISW:x,2" or due to
the fact that the SMTP service state changes to "Down" state without any error.
HTTP / POP3 Parameter not applicable, i.e. value is ignored.