Change node property from ui

[jegham aymen]

Let's say i have a email node and mqtt node ,and i want to change the "mqtt topic", "send to adress" ,"from adress" and "password",...etc from the ui ,i see passing these values to the email or mqtt node is deprecated and won't work anymore, is there other solution to that ? thank you all 

[Nick O'Leary]

In the case of the MQTT Topic, as long as you leave it blank in the MQTT Node, then msg.topic will be used to determine the topic.

So you could use a flow context property (eg flow.myTopic) to store the 'current' topic you want to use, and stick a Change node ahead of the MQTT node to set mqtt.topic of each message passing through.

When you say from the UI, I assume you mean a node-red-dashboard UI? If so, wire the output from the ui widget to a Change node to update the flow context value.

A similar approach can be used for the email node (although I can't remember off the top of my head which of those properties can be set by msg property). They key thing is you must leave the property blank in the node config in order for the msg property to override it.

Nick

On 17 October 2017 at 23:04, jegham aymen <jegham....@gmail.com> wrote:

Let's say i have a email node and mqtt node ,and i want to change the "mqtt topic", "send to adress" ,"from adress" and "password",...etc from the ui ,i see passing these values to the email or mqtt node is deprecated and won't work anymore, is there other solution to that ? thank you all 

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[Colin Law]

On 17 October 2017 at 23:04, jegham aymen <jegham....@gmail.com> wrote:

Where did you see that these are deprecated?

Colin

[jegham aymen]

Hi Colin , 

Here is the link: https://github.com/node-red/node-red/wiki/Deprecated:-Message-properties-overriding-set-node-properties

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[jegham aymen]

Thank you nick,that was helpful regarding mqtt output topic , but i am still in the quest for an approach to dynamically change my coming mqtt  topic on my UI dashboard so i can switch from one sensor to one another(every sensor has its own topic) ,i would like also to be able to enter email credentials from UI to enable SMTP messaging ...the case is i have too many sensors in my network and are sending measurements through mqtt and i would like to find an approach to make the factory users switch and control such options without access to the editing panel ..is there anything i can do ?   

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[Colin Law]

That link is talking about the situation where a value has been set in
the node, then an attempt is made to change it using the message. If
all you want to do is set it from a message then leave it blank in the
node config. That is not deprecated.

Colin

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