SOFTWARE SUPPORT / NODE-RED
Create your first flow
Inject a known number and verify one visible message. No field device or broker is required.
Enlarge diagram +Add Inject
Create an Inject node. Set msg.payload to the number 255 and leave periodic repeat disabled.
Connect Debug
Add a Debug node that displays msg.payload. Wire the Inject output to the Debug input.
Deploy, then inject
Apply the flow, open the Debug sidebar and click the Inject button once.
Check the result
Expect one numeric payload of 255. Change it to 305, deploy again and verify the changed output.