Internet of Things!Internet of Things!Discuss with your board

How many languages in IOT?How many languages in IOT?

The web discuss in HTTP (typically)The web discuss in HTTP (typically)

and my board?and my board?

HTTPMQTT

LWM2MCOAP

UDP/IPTCP/IP

The HTTP nature

Not connected

Client/ServerClient/Server

String based

Formats, parsers and low resources

We have just 2k bytes of RAM...

Ok, we have to proxy all things...

We also have to drink a couple of beers...

Beeeeeerrrr!!!

Board is connected directly using TCP/IP

● Connected protocol (we can discuss about this)

● New application support (we have to design it)

● New application formats (we have to design it)● New application formats (we have to design it)

● No error management (we have to design it)

● No re-connect on failures (we have to design it)

Users uses HTTP resources

● Resources basedo GET http://domain.tld/a-path

● Existing applicationso Browsers, Api clients etc...

● Existing formatso HTML, JSON, XML etc...

● Response code (eg. error management)o 4xx Client errorso 5xx Server errors

How the board is connected to users

Not Connected → Connected

BoardProxy

Connected TCP/IPSTREAM

User 1

BoardProxy

User 2

Other cloud services

How the proxy works

TCP/IP Module

Golang ChannelHTTPServer

s.writeChannel <- data[0]

ON/OFF LED

ModuleGolang Channel

Serverdata = <-s.writeChannel

The flip-side of the discussionThe flip-side of the discussion

The proxy cannot contact users at anytimeusers at anytime

How the board is connected to users

HTTP Client/Server model can be a problem!

● Unable to discuss with users at anytime…o Cannot shows any board figure (any nature)

● How to add the missing method?o HTTP Pollingo HTTP Long Pollingo HTTP Chunked responseso Web Sockets

● Change the application layer?o MQTT - Telemetry Transport

Just grab the server code! Golang!func main() {

router := mux.NewRouter()

server := proxy.Server{

Router: router,

HttpServer: &http.Server{

Addr: "0.0.0.0:8082",

Handler: router,

},},

BoardServer: &board.Server{

Addr: "0.0.0.0:9005",

},

}

server.ListenAndServe()

}

https://github.com/wdalmut/iot-http-to-low-level

Embedded Side

● Now the server side is up and running● I’ve still to solve the embedded side

problem…Excuse me Sir,

● How to Continue???o First I have to choose a platformo Then I have to choose a development

environment

Excuse me Sir, what do you mean Platform???

Which Platform?

● The Platform, in this case, is the electronic object that will embed our application

● IoT = Internet Of Things● In many cases “Small Things”...● In many cases “Small Things”...● Not much space… we have to make it as small as

possible

● Use a Microcontroller

What About TCP/IP Interface?

● TCP/IP is a pretty much complicated protocol● It has been developed during ‘70 by a group of

engineers

● You don’t want to do it again...

● Use a Tcp/Ip Module● Wiznet W5100

HW Setup

Wiznet

Microcontroller

LEDs

Looking for an Environment

● Lots of Environment for Microcontroller C code development

● Very complicated to use and understand● C language is pretty complex● C language is pretty complex

Just Make It Simple...

● What about a Graphic Environment?● It will reduce the code overhead and simplify application

development :-)

● Yes, it is scalable if you use it in the right way…● Yep, it could be debugged like a text based…● Yeah, it can be simulated as well…● Sure, it could… OK, please somebody stop the

questioning engineer!!!

Make it simple...and Smart

● We are going to use flowcode for the development of embedded side

● Flowcode is a Graphic Integrated Development Environment (or G-IDE)Environment (or G-IDE)

● It looks like a flowchart, but allow you to program microcontrollers FLASH memory

Make it veeery simple...

Pretty Cool, Ah?

Using a Component

● Inside Flowcode a lot of complex problems could be easily solved using a component

● A component is a set of API that allow you to interface a complex peripheral inside your flowchartcomplex peripheral inside your flowchart

● In Flowcode, CAN, USB, Ethernet are all components● Besides APIs, components require also an initial

configuration, in the form of, so called, “extra properties”● A component is added to a project simply

Dragging&Dropping it inside the project itself

Configure Ethernet Component

GateWay Address

SubNet MaskSubNet Mask

Our Node Address

TCP/IP Management 1

TCP/IP Management 2

And it Works!!!

Amazing!!!

Beeeerr!!!

Wants only Graphics???

Code References

Embedded Code:● www.francescoficili.com

Golang Server Implementation:Golang Server Implementation:● https://github.com/wdalmut/iot-http-to-low-level

Labview Server Implementation:● www.francescoficili.com

Learn More

FlowCode: ● Product Website: http://www.matrixtsl.com/flowcode/● Italian Course: http://www.elettronicain.it/MyMain/corsi/

Golang:● https://golang.org/