Motorola G24 Guide Developer's Manual page 492

GPRS/EDGE
The following table shows the +MPING unsolicited response parameters.
<"Destination IP">
<type>
<code>
<RTT>
Notes:
3-408
Table 3-274: +MPING Unsolicited Response Parameters
<Parameter>
1. Ping request is being executed from the moment the valid AT+MPING set command
was received by G24 until +MPINGSTAT unsolicited report with <status> equal either to
0 or 2 is sent to DTE or ping request execution was aborted with AT+MPING=0
command. Refer to description of +MPINGSTAT unsolicited response for details.
2. In some cases, the reply message for an Echo Request message might be not an Echo
Reply messages but rather some other ICMP message, which is reporting an error in
datagram processing. For purpose of reporting an exact type of response for sent Echo
Request message, unsolicited response includes <type> and <code> fields.
The first octet of the data portion of the IP datagram is an ICMP <type> field. The value
of this field determines the format of the remaining data. The <type> and <code> fields
jointly define ICMP message type.
For example, a case when an Echo Request message encapsulated in IP datagram to be
forwarded by a gateway has exceeded TTL (equal zero). In this case the gateway must
discard the datagram and may return an ICMP Time Exceeded message.
AT Commands Reference Manual
Description
Specifies the message sender machine (computer),
which is identified by IP address 4 octets long in dotted
decimal notation. Each octet of IP address has valid
value range of 0 to 255. The message sender machine
(computer) may be either the target of Echo Request
message (if a response was an Echo Reply message) or
a gateway (router) in a path of Echo Request message
passage for any other ICMP response message.
The first octet of the ICMP header is a ICMP type field,
which specifies the format of the ICMP message. Refer
to IETF RFC 792 for <type> valid values.
The reasons for the non-delivery of a packet are
described by code field value of ICMP header. Every
<type> has its own defined <code> values. Refer to
IETF RFC 792 for <code> valid values.
Specifies Round Trip Time (RTT) measured in
milliseconds. This parameter will be reported in
command response only if Echo Reply message was
received.
December 31, 2007