Node-RED - The wiring editor
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Tab
Will Message
In the tab
Will Message
you configure the topic that is sent before a
connection is terminated.
Information on the Will Message, an MQTT message that is sent at the end
of the lifetime of a node, if a topic is entered here.
Figure 71: Dialog box MQTT broker config node - tab Will Message
Parameter Type
Description
Topic
Input field
In the input field
Topic
you can enter the topic of the MQTT
communication. If you leave this field blank, no Will
Message will be sent. In that case, all other parameters of
this tab are meaningless.
QoS
Selection list
You can set the selection list QoS (Quality of Service) to
one of the three values 0, 1, and 2. The meaning of these
values is as follows:
0 = At most once (no acknowledge by the receiver)
1 = At least once (the sender stores the message until it
receives an acknowledge from the receiver)
2 = Exactly once (Sender and receiver acknowledge the
message using additional acknowledge messages)
Retain
Selection list
Here you can set whether the connection is to be
maintained after use:
TRUE: The connection is to be maintained.
FALSE: The connection will be terminated.
Payload
Input field
Here you can enter the payload (text) to be transmitted in
the Will Message via MQTT.
Table 39: Parameters in the tab Will Message
Edge Gateway | NIOT-E-TPI51-EN-RE (Connect)
DOC170502UM04EN | Revision 4 | English | 2018-08 | Released | Public
© Hilscher 2017 – 2018
