The easiest and quickest way to get started with Programmable Wireless connectivity for your IoT (Internet of Things) devices is to use Machine to Machine commands.
With the simple steps in this Quickstart, we will show you how you can send and receive text-based commands using the Arduino MKR GSM 1400 development board.
While most of your code will be transferable, new product development for 2G in the United States is not a good choice. 2G networks in the United States are being deprecated. For new product development, we suggest researching alternatives or discussing your idea with the Twilio Programmable Wireless team.
In this Quickstart, you'll learn how to:
- Sign up for a Twilio account.
- Purchase your first SIM cards for Twilio Programmable Wireless.
- Insert your SIM card into the Arduino MKR GSM 1400 development board.
- Power and flash the board.
- Send a Machine to Machine command from the Arduino MKR GSM 1400 and read it in the Wireless Console.
- Receive a Machine to Machine command on the Arduino MKR GSM 1400.
Already have a Twilio account and a SIM card? Skip ahead to the register and activate step by clicking the button at the end of this section.
Before you can connect with Twilio Programmable Wireless, you'll need a Twilio Account and a SIM card.
After you have signed up, then purchase a set of 3 starter SIMs:
Orders of 10+ SIMs will be delivered with the SIM cards already registered to your account.
Detailed information about ordering SIMs is available here.
Once you receive your SIM shipment, pick a favorite and unpack it.
In the Console, open the Register a SIM page in the SIMs section of the Programmable Wireless menu and enter the registration code as instructed:
Next, pick a distinct Unique Name for this SIM.
Select a Rate Plan from the options provided by Twilio.
We have created data metering quotas that are optimized for both high and low usage devices. You can use our data usage estimator to find the right Quota for you. Rate Plans also let you control every aspect of what your device can do with data, voice, and messaging.
For this quickstart, you can choose a low volume plan but ensure the plan you choose includes messaging.
When you're happy with the name and plan, Activate the SIM card.
Detailed information about registering and activating SIMs is available here.
If your module does not come with a PCB (onboard) antenna, you need to connect a wired PCB antenna to the board. If you are unsure, check for an antenna included with your module or read the documentation included with your purchase.
Carefully attach the antenna to the board. Although your board may differ, here is a picture of one module with an antenna connected:
Punch out your Twilio SIM card and, if necessary, insert it into the slot on the module. Be very careful to get the orientation correct with the SIM card insertion. If you are unsure of the correct side to insert, look for a diagram on the housing or the board showing the layout.
On our version of the board, the SIM housing shows the correct SIM orientation:
Locate the JST connect and plug the Lipoly Battery into the board. The battery must be plugged in at all times for connectivity to work.
Your setup may vary, but one possible setup will look like this:
- In the Arduino IDE, go to Sketch > Include Library > Manage Libraries.
- In the Library Manager search for and install the MKRGSM library.
You can download the code directly from this directory on Github.
- Load the file
m2m_command_arduinomkrgsm.inointo the Arduino IDE. Alternately, you can copy/paste the code into a new Arduino sketch using File > New Sketch.
- Power your Arduino MKR GSM 1400 by connecting it to your computer using a USB cable.
- Wait for a few moments.
- Then in the Arduino UI, select your board and the serial port it enumerates from Tools > Board > Arduino MKR GSM 1400.
Now, upload (flash) the code to the board. You have a choice:
- One way is to use the Upload button on the toolbar
- Another is to select Upload from the Sketch Menu.
One way is to use the buttons on the toolbar, another is to select 'Upload' from the 'Sketch' Menu.
While the board receives your code, open the Serial Monitor from the Tools menu.
And that's all you need to do on the Arduino side! Watch the monitor and you should see it churn away and send an M2M command:
If you don't see the above, make sure the power is connected and you have the speed set to 115,200 baud. Power cycle or hit the reset button on the Arduino board to have it spin through again.
Let's look at how the message was sent in the next session then prepare to send a response from our computer.
We're included a very small helper library to assist you sending M2M commands. Here's the method to send a machine to machine command:
Behind the scenes, we send an SMS to the shortcode 2936.
The easiest way to check the command was successful is through the Programmable Wireless Console.
- From the Console, select SIMs from the Programmable Wireless menu.
- Click the SIM you are using for this project, then navigate to the Commands tab.
- Copy the SIM Sid.
As you might guess, we will implement the reverse - you'll receive an inbound SMS from 2936 on the Arduino triggered by an API call using the SIM's Sid. Let's look at that next.
Sending (or in this case, manually responding to) a Machine to Machine command is very straightforward from your development machine.
The fastest way to respond to a command is to use cURL if available. If you can, send a command (under 160 ASCII characters) back to the SIM using cURL:
curl -X POST https://wireless.twilio.com/v1/Commands -d 'Sim=DEXXXXXXXXXXXXXXXXXXXXXXXXXXXX' -d 'Command=Testing return' -u 'ACXXXXXXXXXXXXXXXXXXXXXXXXXXXX:YOUR_API_KEY'
Otherwise, commands can be sent from our helper library:
Again, we've included code to help you receive the M2M command easily.
To test this out, return to the Arduino IDE and make sure the Serial Monitor is still connected.
Cycle power or reset the Arduino MKR GSM 1400. If all goes well, the Arduino MKR GSM 1400 should once again send a command, then after a short wait, you should see...
And that's all there is to Machine to Machine commands. You now know how to send them from an Arduino MKR GSM 1400 and check their status in the console. You can also return a message from your machine and have seen how to receive it on your Feather.
With those basic building blocks you're ready to build the next big IoT Thing!
Now that you have seen how to send and receive Machine to Machine commands on both your Arduino MKR GSM 1400 and development machine, you're ready for your custom application. Here are some possible ideas to take it to the next level:
- Try full end-to-end applications with Twilio Wireless Blueprints
- Dig into the Programmable Wireless API
- See all Programmable Wireless Guides and Tutorials