Enable data connection
: Enable or disable data connection through gsm modem.
Priority SIM
: Primary SIM card (if Dual SIM modem is used). Mainly used for pinger configuration.
Service Type
: Which radio access technology will be used when connecting to gsm network.
Pinger configuration
Pinger is a service which pings two hosts (primary and secondary) to check internet connection.
If both of these hosts are unreachable pinger will wait and restart modem (or switch SIM card, if
DualSIM modem is installed in WCC Lite)
Disable
: Disable pinger functionality.
Failed ping count
: Limit of failed ping requests, before pinger decides, that internet connection is
lost.
Reset modem
: If checked, pinger resets gsm modem after ”Failed ping count”.
Switch SIM
: If checked, pinger switches SIM to nonpriority after ”Priority SIM retry count”. If internet
connection is not available with nonpriority SIM as well, pinger switches back to priority SIM after
one failed ping attempt.
Priority SIM retry count
: How much blocks of failed pings will the pinger tolerate, before switching to
nonpriority SIM.
Ping interval (minutes)
: Interval between ping requests.
Primary host
: The host, that will be pinged first.
Secondary host
: The host, that will be pinged second, if primary host fails.
Network interface
: GSM network interface name.
GSM Pinger is used to detect the status of network connection via cellular
network. This status is written to file (
/var/run/board/internetstatus
) and can be
configured to be sent to SCADAs. If pinger is disabled, status is always set equal
to zero and should not be trusted to represent internet status. Additionally, this
status is reflected in ”Status”>”GSM Status” window.
This is Pinger functionality described step by step:
• Pinger will ping primary host every 2 minutes.
• If primary host fails, pinger redirects to secondary host immediately.
• If either primary or secondary host is responding to ping requests, pinger will continue testing
connection every ”Ping interval (minutes)” parameter and no further action is taken.
• If both primary and secondary host are unreachable, pinger will start pinging these hosts every
”Ping interval (minutes) / 2” minute for ”Failed ping count” times.
• If hosts are still unreachable, pinger will try to switch SIM and restart modem (if corresponding
parameters are set) or will restart immediately if single SIM modem is used.
• SIM card is switched to nonpriority SIM after ”Priority SIM retry count” failed modem restarts
with priority SIM. If nonpriority SIM fails, it is swtiched to priority SIM in next pinger action.
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