Microhard Systems BulletPlus Operating Manual page 30

4.0 Configuration
Once the connection is lost, the modem will send one of the requests
to the remote host to determine the connection status. If the modem
fails to get the response, it will re-send the request within the seconds
specified by Keepalive Interval below:
ICMP: Send a "ping" request
HTTP: Send a "wget" request to a HTTP server
DNS Lookup: Send a "dslookup" request to a DNS server
Specify a IP Address or Domain that is used to test the modems
connection. The modem will send out the connection requests to the
specified Host.
The Interval value determines the frequency, or how often, the unit will
send out PING messages to the Host. The BulletPlus will first attempt
to re-initialize the cellular model before performing a full system
reboot, thus the interval may be delayed by up to 120 seconds)
The Keepalive Retry is the maximum number of connection failures
such as "Host unreachable" the unit will attempt before the unit will
reboot itself to attempt to correct connection issues. The default
number is 20, and valid value is from 10 to 200.
© Microhard Systems Inc.
Type
Values (Selection)
ICMP
HTTP
DNS Lookup
Host Name
Values (IP or Domain)
8.8.8.8
Keepalive Interval
Values (seconds)
300
Keepalive Retry
Values (number)
20
30