The information in this presentation is public. | Copyright © 2016

MBED TUTORIAL

Edinburgh - May 2016

Hannes Tschofenig - ARM Limited

Enabled by the mbed ecosystem

BBC MICRO:BIT

Programmable IoT

device given free to

every 12year old

child in the UKShipping in February

2016

MBED SMART CITY REFERENCE DESIGN: SUB-

GHZ 6LOWPAN

Sub-Ghz technology for robust long-range communications• Significant penetration on materials

• Long range distance communications

6LoWPAN enables native IP-

based connectivity thru backhaul

networks

Appmbed

Device Connector

6LoWPAN

nodes

ISPAccess Point

IPv4IPv6IPv4

Tunnel

Broker

IPv4IPv6

AYIYA Tunnel

Raspberry Pi

IPv6

6LoWPAN

Border Router

MBED WEARABLE REFERENCE DESIGN ON

MBED.COM

Ultra Energy

Efficient Products

Build differentiated

products quickly

Tools for

successful

ecosystem

Components and

code needed to

bootstrap

Tested to deliver

8-week long battery

life.

Ready development

tools from mbed

partners

TAKING IOT TO SCALE

Productivity &

Time-to-market

Connectivity &

SecurityDeployment diversity

CONNECTIVITY

To use the Web and the Internet to the best possible extend IoT devices need to support IP.

Modern 32-bit MCUs easily handle IP stacks (and Internet security as well)

Non-standard approaches are a risk• Particularly when it comes to rolling out

your own, custom security mechanism.

Information Models

IPv4 | IPv6

UDP | TCP

DTLS | TLS

CoAP | HTTP

REST APIs

IoT Application Device Management

Hardware Interfaces

uVisor

Drivers

Networking

mbed OS API

mbed TLS

mbed Client

IP Stack BLE API

Device DriversCMSIS-Core

Application Code Libraries

uVisor

Debug Support

Software UpdateSecure Drivers

ARMv6-MARMv7-M

ARM Cortex-M CPU

MCU

Radio

SensorCrypto

SW Crypto

ThreadWiFi BLE6LoWPAN

Thread API

CommunicationSecurity

LifecycleSecurity

DeviceSecurity

SECURITY

UDP TCP

CoAP HTTP

IOT DEVICES?

Limited RAM

Limited Flash memory size

Computational capabilities

Energy efficiency

User interface limitations

Low bit rate

High loss rate

Small frame sizes/MTU

sizes

Limited reachability

See also RFC 7228 “Terminology for Constrained-Node Networks”

Constrained Node Constrained Networks

CORTEX-M PROCESSORS

Lowest costLow power

Example: Touchscreen

Controller

Lowest powerOutstanding energy efficiency

Example: Sensor node

Bluetooth Smart

Performance & efficiencyFeature rich connectivity

Example: Weables,

Activity trackers, Wifi receiver

Digital Signal Control (DSC)/

Processor with DSP

Accelerated SIMD

Floating point (FP)Example: Sensor fusion,

motor control

Processors use the 32-bit RISC architecture

http://www.arm.com/products/processors/cortex-m/index.php

Maximum Performance

Flexible Memory Cache

Single & Double Precision FPExamples: Automotive,

High-end audio set

EXAMPLE: STM32F215RET6

32bit CORTEX M3 with120 Mhz

Flash: 512 KB

RAM: 128KB

Features: • Interfaces: CAN, I2C, SPI, UART, USART, USB, Ethernet

• Camera interface

• Random number generator, hardware accelleration (AES-128, AES-192, AES-256, Triple DES, MD5, SHA1, HMAC)

• Real-Time Clock

• A/D & D/A Converters

• Temperature sensor

• Serial wire JTAG debug port

Datasheet can be found here.

Farnell

Volume Price

1 - 9 € 16,49

10 - 99 € 13,61

100 - 249 € 10,15

250 - 499 € 8,99

500 - 999 € 8,09

1000 - 1999 € 7,35

2000+ € 6,62

*: Prices from March 2015

EXAMPLE: STM32F415ZGT6

32bit CORTEX M4 with168 Mhz

Flash: 1MB

RAM: 192KB

Features: • Interfaces: CAN, I2C, SPI, UART, USART, USB, Ethernet

• Camera interface

• Random number generator, hardware accelleration (AES-128, AES-192, AES-256, Triple DES, MD5, SHA1, HMAC)

• Real-Time Clock

• A/D & D/A Converters

• Temperature sensor

• Serial wire JTAG debug port

Datasheet can be found here and here.

Farnell

Volume Price

1 - 9 € 12,40

10 - 99 € 11,36

100 - 249 € 10,14

250 - 499 € 9,33

500 - 999 € 8,59

1000 - 1999 € 7,90

2000+ € 6,75

*: Prices from March 2015

EXAMPLE: STM32L063C8T6

32bit CORTEX M0+

with max 32 Mhz

Flash: 64 KB

RAM: 8 KB

Datasheet can be found here.

Mouser*

Volume Price

1000 € 2,25

2500 € 2,14

5000 € 2,06

*: Prices from March 2015

COST

Reducing total system cost by enabling better system tradeoffs

We care about this.

… if it results in savings here …

(e.g. sophisticated power management)

But it can make sense to spend more here …

(e.g., on flash/RAM, CPU, BOM)

= + +

Total Cost Hardware Cost Energy Cost Development Cost(amortized, inc. deployment cost)

… and here.

(e.g. firmware

update,

manageability)More detailed treatment of this topic in a webinar by Peter Aldworth about

“How to Select Hardware for Volume IoT Deployments?”

ARM Cortex-M Architecture

mbed OS mbed Device Connector mbed Cloud Partnership

mbed Silicon Partnership mbed Enabled

Collaboration and contributions

from over 55 partners

Over 100 boards available

for developers to get started

MBED DEVICE CONNECTOR:

MAKING IOT SCALE

• mbed Device Connector eases development, management and scaling of IoT

• Available at connector.mbed.com. Easy transition to commercial service

providers

Build IoT

Device Connect your devices

Build application

with example

code

Utilize cloud

solutions

MBED DEVICE CONNECTOR

• Free for development purposes

• 100 devices, 10,000 events per hour

• Caching and subscription aggregation

• Strong end-to-end trust and security

• Based on industry standard protocols for

energy-efficient data communication

• REST APIs for easy integration with

existing systems

• Full integration with and web tools on

mbed.com

Device Connector

Support

Protocol Implementations: LWM2M, CoAP,

HTTP

Channel Security Implementations: TLS, DTLS

Client Library Port

mbed OS or RTOS/Linux +

Networking

mbed Client C++ API

Application and Service Integration

MBED CLIENT

Connects to mbed Device Connector and mbed Enabled Services

Included as part of mbed OS, also portable to other platforms including Linux and third party RTOS

Implements protocols and support for securely publishing resources (e.g. sensor data), and managing the device from the cloud

• mbed TLS makes it easy for developers to include cryptographic and

TLS/DTLS capabilities in their embedded products, with a minimal code

footprint.

• mbed TLS makes it easy to disable any feature during compilation thus

reducing the footprint to only those features absolutely needed.

• Small footprint and API’s with full documentation available

• Open Source under Apache 2.0 license at https://tls.mbed.org/

• Suitable for use on Cortex-M and Cortex-A targets

MBED TLS

GETTING STARTED

• Entry Point: https://www.mbed.com

• Getting started guide:

https://docs.mbed.com/docs/getting-started-mbed-os/en/latest/

• Running your first program (blinky):

https://docs.mbed.com/docs/getting-started-mbed-

os/en/latest/FirstProjectmbedOS/

• Mbed Client Example:

https://github.com/ARMmbed/mbed-client-quickstart

• ARM mbed Developer site (with mbed Classic Online IDE):

https://developer.mbed.org/

DEVELOPMENT

BOARDS

• Freescale – K64F http://developer.mbed.org/platforms/

FRDM-K64F/

ARM Cortex-M4 (120MHz)

1MB FLASH, 256KB RAM

• Other supported boards: Mbed Classic:

https://developer.mbed.org/platforms

Mbed OS: https://www.mbed.com/en/development/hardware/boards/