Page 123 - Programming the Photon Getting Started With the Internet of Things

Device ID=55ff74062678501139071667
Access Token=cb8b348000e9d0ea9e354990bbd39ccbfb57b30

Note that we have everything we need and the program is running on the Photon
waiting for the led command to be sent. We can now send a command to it to turn the

LED on using curl in the command line. To test this, we can send the following
command:

curl https://api.spark.io/v1/devices/<deviceid>/led -d access_token=<access
token> -d params=on

This command shows us how to use curl to send an HTTP request to control the LED.
Before you do this, however, you need to change the device ID and access token with your
token ID, which we discovered earlier. You can paste this command into the command
line using curl as shown in Figure 6.5.

Figure 6.5 Sending an HTTP command using curl.

If everything went well, the LED connected to your Photon board should light up
almost instantly, and you will see a response from your Photon device containing the

information that it was successful by returning a value of 1. To turn the LED off again,
you can issue the same command that we sent earlier, but change the value from ON to
OFF and press ENTER. You should see the LED turn off.

Web User Interface

Controlling your devices through the command-line tool is an excellent way to test out