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Events
1.3
Event.MulticastTrigger
The
MulticastTrigger
block defines the event generated by receiving of a command
sent via
SendMulticastRequest
. The request is a message sent by UDP to a
multicast address (235.255.255.250:4433) and can thus be received by multiple
devices at the same time. The message includes the command ID (Command
parameter) and additional optional parameters. The message can be password-
secured (Password parameter).
Parameters
Command
Define the command ID to distinguish separate command types. The
MulticastTrigger block responds to the SendMulticastRequest action only if the
command identifier is the same. Any text containing the A-Z, a-z and 0-9
characters can be used for identification. The Upper/Lower case must be
respected in the command name.
Password
Define the password to secure the command against unauthorised access. The
password must match the value defined in the SendMulticastRequest action to
which MulticastTrigger is expected to respond.
CheckTime
Enable/disable the check of the command receiving time against the time value
included in the command message to eliminate attacks caused by repeating of an
already processed message. Synchronised time (via the NTP server) on all
command sending and receiving devices is required for this function.
Valid values:
0
– message time is not checked
1
– message time is checked (enhanced security)
The parameter is optional, the default value is
0
.
Variables
The MulticastTrigger event is generated whenever a mass command including the
list of user parameters (Params parameter, MulticastRequest action) is received.
Each of the parameters has a user-defined unique name and is available as a
variable of the same name in the MulticastTrigger block.
Example:
Suppose a mass command generated by the MulticastRequest action is received,
in which Params=“AAA=123” is included. The MulticastTrigger event which