MLB-S-BGS2-BW Terminal User Guide
52
Rev 1.3
If <reqReadLength> equals 0 (peek operator) the value indicated by <cnfReadLength> may
be greater than 1500.
< urcCauseId >
(num)
Indicates whether or not data is available for reading with AT^SISR.
1
Data is available and can be read by sending the AT^SISR command. The URC appears when
less data was confirmed (in <cnfReadLength>) than requested (with <reqReadLength>) during
the last "Read Data" operation and new data is available.
2
End of data. Data transfer has completed (all data read). The service can be closed with
AT^SISC.
< remainUdpPacketLength >
(num)
Optional third parameter of the AT^SISR write command response displayed only if the Socket service uses
the UDP protocol.
The reception of each datagram must be completed before the next datagram can be received. This may be a
problem if the buffer of the host application is limited and not designed to handle the maximum packet size of
1500 bytes. To compensate this, the host is advised to request, via <reqReadLength>, an amount less or
equal its maxmimum buffer capacity and wait for the resulting AT^SISR write command response with
parameter <remainUdpPacketLength>. The benefit of this approach is that the host may properly receive all
parts of a UDP datagram, as after each received data part the number of remaining bytes is synchronized, until
reading
the datagram is finished.
If the currently read datagram is smaller than the number of bytes requested by the host the
<remainUdpPacketLength> parameter is omitted.
Further write attempts with AT^SISR are denied as long as the <remainUdpPacketLength> is unequal 0 or is
not omitted. In this case the service returns "+CME ERROR: operation of service temporary not allowed".
0
Indicates that all bytes of the current UDP datagram are read.
1...(max. data size)-1
Indicates that the currently read UDP datagram is not yet complete. The displayed
value is the remaining number of bytes.
<remainUdpPacketLength> is unequal 0 until reading all parts of the current
datagram is finished.
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