Resolute User Manual Version 2.5
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Iridium Keep Alives in the XeosOnline Message Tab
Tunnel connections over cellular are normally stable (in good cellular coverage). Tunnel
connections over Iridium RUDICS will have interruptions under normal operation. The maximum
data transfer rate of Iridium RUDICS is 17 KB/min.
The user of the remote device can interact with the device through a number of interface
(sockets) into the tunnel. These include an embedded HTTP (Web) Server, automatic download
scripts and a Telnet Server. It is possible to open only one socket of the tunnel at a time. Multiple
open connections to the tunnel will result in the tunnel disconnecting. The tunnel will reconnect
after disconnecting provided the tunnel end time is not met. See
for information on
setting up Iridium Service.
SBD: Theory of Operation
SBDs are a low cost, low power method of communicating remotely with your unit if you have
an Iridium modem installed. They are the Iridium equivalent of a text message (SMS). The
Resolute schedules SBD message checks using the scheduler. At a scheduled interval, the unit will
check for messages at the Iridium gateway. SBDs cannot be sent at the same time as RUDICS
tunnels are scheduled. If an SBD message check is scheduled during a tunnel connection, it will
be executed upon the tunnel reaching its end time. Any messages sent by the user between the
last message check and the next message check will wait at the Iridium gateway for the unit to
check in. The unit requires an unlock code in order for any message sent to the unit to issue a
command to prevent undesired command and control. Unlock codes are sent out to the
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