Netualizer

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====== WPAN IoT Use Case: IEEE 802.15.4, CoAP and Azure ======

Netualizer can also be used to set up a real life //WPAN// IoT topology. For example:

{{:wiki:ieee802154.png?700|}}

In this case, an embedded device (a raspberry pi) running a Netualizer agent is connected through an //I2C// interface to an 12-bit Analog-to-Digital (//ADC//) converter //[[https://www.ti.com/product/ADS1015/|ADS1015]]//. The readouts generated by the //ADC// are encapsulated by //CoAP// and transmitted over //IEEE 802.15.4//. The frames eventually arrive at a laptop that also runs a Netualizer agent. The readouts are decapsulated and transmitted over MQTT to a Microsoft Azure IoT Hub. As in other examples, once the controller programs and deploys the agents, it is not needed anymore. The real scenario looks like:

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First, let's create a new project by clicking on //File ⇒ New ⇒ Project//. Name it //802154Azure//. Make sure that the local built-in agent does not get attached (uncheck box):

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Then attach the agent running on the device sensor by clicking on //Agents ⇒ Add Agent// and entering the management IP address of the raspberry pi that runs the Netualizer agent:

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Double click on the agent entry and name it //sensor//:

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Attach the agent to the project:

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Create a physical link layer and select the IEEE 802.15.4 radio:

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And place it on the configuration:

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Then let's create an IEEE 802.15.4 layer and call it //ieee802154//:

{{:8.png?1000|}}

Place it on top of the physical layer:

{{:9.png?1000|}}

Similarly, create an 6LoWPAN layer, call it //sixlow//, place it on top of the //ieee802154// layer. Then create an IP layer and name it //ip//:

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Put the //ip// layer on top of the //sixlow// layer and create a new UDP layer and name it //udp//:
 
{{:12.png?1000|}}

Place the UDP layer on top of the IP layer and create a new CoAP layer. Call it //coap//:

{{:13.png?1000|}}
 
Put the //coap// layer on top of the //udp// layer. The stack should look like:

{{:14.png?1000|}}

Then create an I2C interface and call it //i2c//:

{{:15.png?1000|}}

Place it on top of the //coap// layer:

{{:16.png?1000|}}

Next, let's create an AD1015 helper layer and name it //ads1015//:

{{:17.png?1000|}}

This finalizes the full stack:

{{:18.png?1000|}}

Now, let's add the other Netualizer agent running on the laptop by clicking on //Agents ⇒ Add Agent// and entering the management IP address:

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Double click on the agent entry and name it //gateway//:

{{:20.png?1000|}}

Add the agent to the project:

{{:21.png?1000|}}

Create a physical layer and select the IEEE 802.15.4 radio:

{{:22.png?1000|}}

Then continue to build the whole stack up to the CoAP layer:

{{:23.png?1000|}}

Now, let's build the ethernet based stack. Click on the physical layer and select the ethernet interface:

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Place it on the configuration;

{{:25.png?1000|}}

Click on the ethernet layer and name it //eth//:

{{:26.png?1000|}}

Put it on top of the physical layer:

{{:27.png?1000|}}

Then let's create an IP layer and call it //ip2// (since the //ip// layer was created on the IEEE 802.15.4 stack):

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Set the //ip2// layer on top of the //eth// layer:

{{:29.png?1000|}}

Create a TCP layer and name it //tcp//:

{{:30.png?1000|}}

Place it on top of the //ip2// layer:

{{:31.png?1000|}}

Similarly, create a TLS layer and call it //tls//:

{{:32.png?1000|}}

Put it on top of the //tcp// layer:

{{:33.png?1000|}}

Then create an MQTT layer and name it //mqtt//:

{{:34.png?1000|}}

Place the //mqtt// layer on top of the //tls// layer:

{{:35.png?1000|}}

Then create an Azure helper layer and name it //azure//:

{{:36.png?1000|}}

Put it on top of the //mqtt// layer:

{{:37.png?1000|}}

Now, let's configure the //azure// layer. First let's right click on it and select action:

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Then select //Publish//:

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Next select the //Hub Name//:

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And enter it in accordance with the Azure configuration:

{{:41.png?1000|}}

Select then the //Device Id//:

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And, again, enter it in accordance with the Azure configuration:

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Select the CA certificate:

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And fill it in:

{{:45.png?1000|}}

Select the client certificate:

{{:46.png?1000|}}

And fill it in:

{{:47.png?1000|}}

And again, select the client private key:

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And fill it in:

{{:49.png?1000|}}

Right click on the IP layer to figure out what the IPv6 address of the IEEE 802.15.4 based stack is:

{{:50.png?1000|}}

Back in the sensor IEEE 802.15.4 stack, select //Url//:

{{:51.png?1000|}}

And enter the URL that results from the IPv6 address //[2001::41:11]/SensorData//:

{{:52.png?1000|}}

Also let's make sure to enable //Post Readouts// in the CoAP layer:

{{:53.png?1000|}}

Change the transmission period on the //ads1015// layer by selecting //Period//:

{{:60.png?1000|}}

And enter //5000//:

{{:61.png?1000|}}

In the CoAP layer of the gateway select the //Forward List// field:

{{:54.png?1000|}}

And enter //SensorData//:

{{:55.png?1000|}}

Make sure to forward traffic arriving at the CoAP layer to the Azure layer by clicking on //Destination Peer// and selecting //azure//:

{{:56.png?1000|}}

The gateway configuration then looks like:

{{:57.png?1000|}}

Then start the suite by clicking on //Scripts ⇒ Run Suite//:

{{:58.png?1000|}}

Azure's Device Explorer shows the 12-bit readouts:

{{:59.png?1000|}}
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