Sierra Wireless AirLink RV50 Series User Manual page 238

ALEOS 4.9.0 Software Configuration User Guide for AirLink RV50 Series
Table 9-2: Location: Servers 1 – 4
Field
SNF Reliable Mode
SNF Simple Reliable
Max Retries
SNF Simple Reliable
Backoff Time (secs)
Rev 1 Dec. 17
Description
Store and Forward Reliability: location reports are retransmitted if not acknowledged by the
server.
Options are:
OFF (Unreliable Mode) (default)—If this field is Off, the device does not expect
•
acknowledgment to any location report sent to the server.
Reliable Mode—A sequence number (1–127) is added to each packet (page). The
•
server acknowledges every 8th packet. If there is no ACK from the server, ALEOS
pings the server and re-sends the packets when the server responds. If the server
receives packets out of sequence, the server NAKs the first and last missed packets.
ALEOS retransmits the missing packets.
Note: Reliable mode is valid only when a RAP report is selected as the
Type.
Simple Reliable Mode—ALEOS attempts to contact the server the configured number
•
of times, after which it stops attempting to contact the server and discards messages
that cannot be transmitted or received after the configured number of tries. When
contacted, the server responds with the ASCII string UDPACK. For information on
configuring the maximum number of retries see
page 238. For information on configuring the backoff time, see
Backoff Time (secs) on page 238.)
UDP Sequence Mode—A hex sequence number (30–7f) is prepended to the packet.
•
The server responds with SEQACK and the sequence number. The sequence number
is not stored and is re-initialized when the AirLink gateway is reset or power cycled.
Unacknowledged packets are dropped after the configured number of retries.
TCP Listen Mode—This mode is the same as UDP Sequence Mode, except that the
•
server initiates the connection using TCP. Use this mode if your server is behind a
firewall. If you are using this mode, the AirLink gateway must have a mobile
terminated/Internet routable IP address.
TCP—By default, location reports are sent over UDP. Select this option if you want
•
the location reports sent over TCP. Because TCP is an inherently reliable protocol, no
additional headers are added to the report packet. TCP works with all location report
types.
Note: You can also use an AT Command to set this field. For more information, see
*PPSNFR on page 451.
When the AirLink gateway is configured to use Simple Reliable Mode, use this field to set
the maximum number of retries when a report is sent and there is no response. Use the
SNF Simple Reliable Backoff Time (secs)
Options are:
Disabled
•
1–255 retries (Default is 10.)
•
You can also use an AT Command to set this value. For more information, see
*PPMAXRETRIES on page 450.
When the AirLink gateway is configured to use Simple Reliable Mode, use this field to set
the interval for the retries. (Use the
maximum number of retries.)
0–255 (Default is 10.)
•
You can also use an AT Command to set this value. For more information, see
*PPSIMPLETO on page 451.
238
SNF Simple Reliable Max Retries
field to set the interval between retries.
SNF Simple Reliable Max Retries
Location Report
on
SNF Simple Reliable
field to set the
41111088