I want to send PLC data to NODE-RED through an IOT gateway so that I can control something as simple as a switch, generate the data value as JSON, and send it to the connected node. (Like a redis node)
I'm wondering where to connect the JSON node.
Can we connect to the function node right after the switch node, make msg.payload a global variable, and connect to the json node?
If I connect a redis node behind a json node to send data, will it be sent as json?
Let me know if I'm wrong or need to be careful.
How are sending the data to/through the IOT gateway? MQTT?
I can't see any MQTT nodes.
The JSON node is sort of used to construct a JSON message. (Or decode deconstruct one).
I am guessing the input from your IOT is where the inject node is?
You mention a switch you want to control.
The terms used are not clear.
So you mean the switch node I can see or are you calling the gate node a switch?
So depending on HOW you are sending the messages you may not need one.
I believe that REDIS is a key/value database. As such, it will only be able to store a simple value as text unless you use an extension to REDIS which I'm guessing the REDIS node would not support?
To store as text, assuming you have the data as a JavaScript object on msg.payload, simply send it through a JSON node before sending to REDIS.
