This document discusses programming Internet of Things (IoT) edge devices using RxFusion. It introduces IoT edge computing and the embedded device landscape. It then describes the RxFusion programming model using components like inputs, outputs, operators, and connectors. The document provides an example "Hello MQTT" program that connects a sensor to a broker. It demonstrates RxFusion on a Udoo board with examples for the microcontroller and CPU. Links are provided for more information on RxFusion and a pedometer example application is shown.

1. Internet of Things:
Programming on the edge
… in RxFusion

2. Agenda
 IoT Edge Computing
 Embedded Device Landscape
 Programming Model
 IoT Components
 Hello MQTT
 Udoo Demo
 Links

3. IoT Edge Computing

4. IoT Edge Devices
CPU FPGA
MCU
SoC
ASSP
Linux
Windows
RTOS
Bare Metal
ARM
x86
AVR

5. RxFusion Programming Model

6. Framework Components
Inputs Outputs
Operators
Connectors

7. Compression

8. Summarization

9. Hello MQTT
#include <WiFi101.h>
#include <RTCZero.h>
#include <RxFusion.h>
WiFiClient client;
MqttPub broker(client,"broker.hivemq.com",1883,"vtcc8/rxfusion/test","vtcc8");
AnalogIn<int> sensor(A1);
void app() {
ConnectWifi("your-wifi-ssid", "your-wifi-password");
sensor >> AverageOver<int>(1000) >> Dedup<int>(30000) >> Format<int>("{"sensor":$1}") >> broker;
}

10. Udoo Demo
M4 A9
ARM ARM
Browser
Freescale i.Mx 6SoloX
SoC

11. Udoo - MCU
#include <RxFusion.h>
Range<int> ramp(-200,200,5);
AnalogIn<int> ambient(A0);
AnalogOut<int> led(6);
Cpu<int> cpu;
void app() {
ramp >> Iterate<int>(100,true) >> Abs<int>() >> led;
ambient >> Poll<int>(250) >> cpu;
}

12. Udoo - CPU
var http = require('http');
var rx = require('rxfusion');
http.listen(8090, function(){
var mcu = new Mcu();
var browser = new SocketIO(io, 'hist');
// Average 5 samples at a time with sliding window of data to socket.io clients
rx()(mcu >> AverageOf(5) >> Window(16,true) >> browser);
});

13. Udoo - Web Page
<script>
var chart = c3.generate({
data: { columns: [], type: 'spline' }
});
var socket = io();
socket.on('hist', function(data) {
chart.load({ columns: [ Array.concat('ambient', data) ] });
socket.emit('ack', 'ok');
});
</script>

14. Links
 Twitter @GreenMtnComp
 Source github.com/sathibault/RxFusion
 Documentation readthedocs.com/project/rxfusion

15. Pedometer
// Extract x-axis and calculate a moving average with a window of 4.
auto smooth = accelerometer >> Project1<xyz>() >> WinAverage<short,4>();
// Produce tuples of original value, min and max over a window of 8.
auto box = smooth & (smooth >> WinMin<short,8>()) & (smooth >> WinMax<short,8>());
// Custom function using C++ 2011 anonymous function uses the original
// value with the min/max to detect rising and falling edges.
auto edges = box >> Map<xyz,int>([](xyz& vec) -> int {
int pos = (vec._1 - vec._2) > 30;
int neg = (vec._3 - vec._1) > 30;
return pos - neg;
})