Publishing Data Stream from Node-Red Manual

Configure MQTT in Node-RED:
From the nodes in the left navigation bar, drag and drop the output mqtt node. 
Double click on mqtt node, click on the pencil/edit button and set these parameters to configure the connection:
Connection Tab Parameters:
Parameter
Value
Server
mqtts.connect.iotflows.com
Port
443
Enable secure (SSL/TLS) connection
Checked
Client ID
Your-Device-API-Key-Username
Keep alive time (s)
60
Use clean session
Checked
Use legacy MQTT 3.1 support
Checked
Security Tab Parameters:
Parameter
Value
Username
Your-Device-API-Key-Username
Password
Your-Device-API-Key-Password
Node-Red Security Parameter 
Node-Red Security Parameters from IoTFlows
After the configuration is done, press the ADD
Once it has been added, click DONE.
Publish a Data Stream from Node-RED:
Drag and drop an inject node.
Drag and drop a function node.
Connect the inject to function to mqtt node, respectively.
Double-tap the function node and write this code:
1
msg.topic = "YOUR-DATA-STREAM-MQTT-TOPIC";
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msg.payload = 
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{
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    "data": "Data from sensor",
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    "data_stream_id": "YOUR-DEVICE-DATA-STREAM-ID",
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    "client_id": "YOUR-DEVICE-CLIENT-ID"
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}
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return msg;
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From the top right corner of Node-RED, tap Deploy.
Tap the button of the inject node and you should receive a data stream.
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