Siemens AC75 manual Thisi, Sdata, Grama, RemainUdpPacketLength, New

AC75 AT Command Set

10.7 AT^SISR

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10.7.1Example: Socket Host Reads Small Amounts of UDP Data Pack- ets (URC Mode)

This section applies only to the Socket service using the UDP protocol. The example shows how to read UDP packets if the buffer of the host application can handle only a few bytes. There are two datagrams available for reading.

Buffer size: 6 bytes

Datagram A = 18 bytes (content "THIS_IS_DATAGRAM_A") Datagram B = 3 bytes (content "NEW")

^SISR: 0,1	Service profile 0 is configured for Socket service and UDP. The URC
	notifies host that data is available for reading.
at^sisr=0,6	The host requests to read 6 bytes.
^SISR: 0,6,12	The first 6 bytes of datagram A are confirmed and transmitted. Another
THIS_I	12 bytes are still available.
OK	The host requests to read the next part of 6 bytes.
at^sisr=0,6
^SISR: 0,6,6	The next 6 bytes of datagram A are confirmed and transmitted. Another
S_DATA	6 bytes are still available.
OK	The host requests to read the next part of 6 bytes.
at^sisr=0,6
^SISR: 0,6,0	Last part of datagram A was received, no remainder is left.
GRAM_A
OK	Again, the host requests to read 6 bytes. This time, the request refers to
at^sisr=0,6
	datagram B which has only 3 bytes. As the read datagram is smaller
	than the size requested by the host, the response does not include the
	<remainUdpPacketLength>.
^SISR: 0,3	3 bytes are confirmed and transmitted. Datagram B was properly
NEW	received.
OK

AC75_ATC_V01.002	Page 282 of 569	10/30/06
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