(check my previous post if you don't know how to create Iot Hub)
Step 1 After creating Iot Hub click on device manager then device as shown below
you can see we have zero device zero message

Then click add device

Step 2 give your device a name and save

Step 3 click the device created and copy the primary connection sting _


Step 4 _Go to web search for raspberry pi stimulator and open

you can see our diode is not working yet

Step 5 go to the code section (number 15) paste the primary connection string you copy and run

paste the code like this

You can see our diode has started blinking shows its working


Step 6 go back to your created Iot Hub in Azure and refresh
you can see we 1 device connected and 123 messages

yes we did it, follow for more tips.