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Jan	Jongboom	&	Alessandro	Grande
IoT	DevFest	2019
Low-power IoT nodes
with	Mbed	and	LoRaWAN
©	2019	Arm	Limited	2
Jan	Jongboom	
Principal	Developer	Evangelist	
jan.jongboom@arm.com
Alessandro	Grande	
Developer	Advoc...
©	2019	Arm	Limited	3
IoT	Networks
Powerconsumption/Bandwidth
Range
©	2019	Arm	Limited	4
10kilometers range years of battery life
©	2019	Arm	Limited	
The	range
©	2019	Arm	Limited
©	2019	Arm	Limited	6
High	link	budget
RX
Derived	from	work	by	Thomas	Telkamp
TX	Power
Connector	loss
Antenna	gain
Connecto...
©	2019	Arm	Limited	7
Link	budget
Wi-Fi
Sub-GHz 6LoWPAN
LoRa
TX	Power RX	Sensitivity Link	budget
20 dBm -75 dBm 95	dBm
11 d...
©	2019	Arm	Limited	8
Theoretical	maximum	in	free	space
2.4	GHz,	with	95.5	dBm	link	budget:

550	meters	
915	MHz,	with	151	...
©	2019	Arm	Limited	9
©	2019	Arm	Limited	10
Unfortunately...	we	don't	live	in	free	space
Attenuation Reflection and diffraction Fresnel zone
©	2019	Arm	Limited	
Based	on	Tokyo	-	model	for	calculating	realistic	path	loss
Picture by Moyan Brenn: https://commons.wik...
©	2019	Arm	Limited	
LoRaWAN
©	2019	Arm	Limited	13
The	secret	behind	low	power	consumption...
!
©	2019	Arm	Limited	14
Device	classes
Flexibility	in	power	conservation	versus	fast	network	initiated	transmission
Class	A	...
©	2019	Arm	Limited	15
Typical	LoRaWAN	Topology
Network	Session	Key:	Message	Integrity
Applicacon	Session	Key:	Join,	Encryp...
©	2019	Arm	Limited	16
©	2019	Arm	Limited	
Mbed	OS	5
©	2019	Arm	Limited	18
Components	required
Bootloader
Asymmetric	crypto
Storage	driver
Resilient	filesystem
Advanced	

netw...
©	2019	Arm	Limited	18
Components	required
Bootloader
Asymmetric	crypto
Storage	driver
Resilient	filesystem
Advanced	

netw...
©	2019	Arm	Limited	19
©	2019	Arm	Limited	20
Arm	Mbed
A	free,	open	source	Platform	OS	targeting	IoT	end	node	devices	
Mbed	
OS
Cortex-M	
RTOS

ke...
©	2019	Arm	Limited	21
Open	source	and	community	built
325,000	developers	
70+	partners	
Apache	2.0	licensed	
https://os.mb...
©	2019	Arm	Limited	22
Example	Mbed	OS	products
Smart	City	
Parking	sensor
Smart	Agriculture	
Soil	monitoring
Smart	Retail	...
©	2019	Arm	Limited	23
Testing
40,000	hours	of	testing	on	*real*	hardware	
Pre-certification	testing	of	LoRaWAN	stack
©	2019	Arm	Limited	
Developing	for	Mbed	OS
©	2019	Arm	Limited	25
Three	development	environments
Online	compiler Mbed	CLI Offline	IDE
C:> mbed
©	2019	Arm	Limited	26
Proper	online/offline	story
C:> mbed
Sync
os.mbed.com

GitHub	
Private	DVCS
©	2019	Arm	Limited	27
Getting	started	-	Online	Compiler
Import https://github.com/janjongboom/iot-devfest
©	2019	Arm	Limited	28
Getting	started	-	Mbed	CLI
Install	Mbed	CLI:	https://github.com/armmbed/mbed-cli	
$	mbed	import	http...
©	2019	Arm	Limited	29
Advanced	features
RTOS	included	(KEIL	RTX)	
Event	scheduler	(Mbed	Events)	
Tickless	mode	and	automat...
©	2019	Arm	Limited	
Mbed	Labs	-	
forefront	of	IoT	innovation
©	2019	Arm	Limited	31
©	2019	Arm	Limited	32
http://mbed.com/js
©	2019	Arm	Limited	33
©	2019	Arm	Limited	34
©	2019	Arm	Limited	35
Google:	"firmware	updates	lorawan"
https://www.youtube.com/watch?v=0NoshDOqmdM
©	2019	Arm	Limited	
Building	something
©	2019	Arm	Limited	37
Three	approaches
Module Radio
Radio	+	MCU	
Easy	to	integrate	in	own	design	
Pre-certified
SX1272	or	...
©	2019	Arm	Limited	38
Picking	a	gateway
Kerlink IoT station
Multi-Tech Conduit
IMST iC880A
Lorix One
The Things Gateway
Lo...
©	2019	Arm	Limited	39
Typical	LoRaWAN	Topology
Devices Gateways Network	Server User

ApplicaTon
ApplicaTon	
Server
©	2019	Arm	Limited	40
Hands-on,	building	a	network
NUCLEO-F411RE
SX1272
Multi-Tech Conduit Network Server
©	2019	Arm	Limited	
https://github.com/janjongboom/iot-devfest
Thank	You!	
Danke!	
Merci!	
!	
!	
Gracias!	
Kiitos!	
감사합니다	
धन्यवाद
©	2019	Arm	Limited	43
Jan	Jongboom	
Principal	Develope...
Low Power IoT Nodes with Mbed and LoRaWAN - IoT DevFest 2019
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Low Power IoT Nodes with Mbed and LoRaWAN - IoT DevFest 2019

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10 years of battery life and 10 km of range? Not impossible with Mbed OS and LoRaWAN. Presentation from Alessandro Grande and me during IoT DevFest in Tempe, Arizona.

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Low Power IoT Nodes with Mbed and LoRaWAN - IoT DevFest 2019

  1. 1. Jan Jongboom & Alessandro Grande IoT DevFest 2019 Low-power IoT nodes with Mbed and LoRaWAN
  2. 2. © 2019 Arm Limited 2 Jan Jongboom Principal Developer Evangelist jan.jongboom@arm.com Alessandro Grande Developer Advocate alessandro.grande@arm.com
  3. 3. © 2019 Arm Limited 3 IoT Networks Powerconsumption/Bandwidth Range
  4. 4. © 2019 Arm Limited 4 10kilometers range years of battery life
  5. 5. © 2019 Arm Limited The range © 2019 Arm Limited
  6. 6. © 2019 Arm Limited 6 High link budget RX Derived from work by Thomas Telkamp TX Power Connector loss Antenna gain Connector loss Antenna gain RX Power Path loss and fading Receiver sensitivity -137 dBm 14 dBm151 dBm link budget
  7. 7. © 2019 Arm Limited 7 Link budget Wi-Fi Sub-GHz 6LoWPAN LoRa TX Power RX Sensitivity Link budget 20 dBm -75 dBm 95 dBm 11 dBm -110 dBm 121 dBm 14 dBm -137 dBm 151 dBm
  8. 8. © 2019 Arm Limited 8 Theoretical maximum in free space 2.4 GHz, with 95.5 dBm link budget:
 550 meters 915 MHz, with 151 dBm link budget:
 850,000 meters
  9. 9. © 2019 Arm Limited 9
  10. 10. © 2019 Arm Limited 10 Unfortunately... we don't live in free space Attenuation Reflection and diffraction Fresnel zone
  11. 11. © 2019 Arm Limited Based on Tokyo - model for calculating realistic path loss Picture by Moyan Brenn: https://commons.wikimedia.org/wiki/File:Tokyo_(16043023330).jpg© 2019 Arm Limited Hata model Large city (250 bps) Large city (1,760 bps) Suburb (250 bps) TX height RX height Range 0.1 m 40 m 4 km 0.1 m 40 m 2.5 km 0.1 m 40 m 9 km Suburb (250 bps) 1 m 100 m 13 km
  12. 12. © 2019 Arm Limited LoRaWAN
  13. 13. © 2019 Arm Limited 13 The secret behind low power consumption... !
  14. 14. © 2019 Arm Limited 14 Device classes Flexibility in power conservation versus fast network initiated transmission Class A ! Class B ⏰ Class C ⚡ Device initiated communication Devices are typically in deep sleep and send messages on intervals and/or events Only after uplink transmission, there is a receive window for downlink messages Best for most sensor applications and battery conservation Time synchronized communication The network broadcasts beacons for devices to sync time In so-called ping slots, devices wake up and the network may send downlink messages Best for most downlink intensive applications Network initiated communication The devices are continuously listening, often temporarily or on power supply The network can send downlink message at any given time Best for downlink intensive applications that require low latencies
  15. 15. © 2019 Arm Limited 15 Typical LoRaWAN Topology Network Session Key: Message Integrity Applicacon Session Key: Join, Encrypcon and Decrypcon Devices Gateways Network Server User
 ApplicaTon ApplicaTon Server
  16. 16. © 2019 Arm Limited 16
  17. 17. © 2019 Arm Limited Mbed OS 5
  18. 18. © 2019 Arm Limited 18 Components required Bootloader Asymmetric crypto Storage driver Resilient filesystem Advanced 
 networking stack Radio drivers FlashIAP Update client
  19. 19. © 2019 Arm Limited 18 Components required Bootloader Asymmetric crypto Storage driver Resilient filesystem Advanced 
 networking stack Radio drivers FlashIAP Update client
  20. 20. © 2019 Arm Limited 19
  21. 21. © 2019 Arm Limited 20 Arm Mbed A free, open source Platform OS targeting IoT end node devices Mbed OS Cortex-M RTOS
 kernel Portable
 drivers Integrated
 security IoT
 connectivity Device management Development tools Developer community Partner ecosystem 150 development boards LoRa, BLE, Cellular, Wi-Fi, etc. 20
  22. 22. © 2019 Arm Limited 21 Open source and community built 325,000 developers 70+ partners Apache 2.0 licensed https://os.mbed.com
  23. 23. © 2019 Arm Limited 22 Example Mbed OS products Smart City Parking sensor Smart Agriculture Soil monitoring Smart Retail BLE Beacon Smart Spaces Air quality monitor Smart Building HVAC sensor Smart Home AI devices
  24. 24. © 2019 Arm Limited 23 Testing 40,000 hours of testing on *real* hardware Pre-certification testing of LoRaWAN stack
  25. 25. © 2019 Arm Limited Developing for Mbed OS
  26. 26. © 2019 Arm Limited 25 Three development environments Online compiler Mbed CLI Offline IDE C:> mbed
  27. 27. © 2019 Arm Limited 26 Proper online/offline story C:> mbed Sync os.mbed.com
 GitHub Private DVCS
  28. 28. © 2019 Arm Limited 27 Getting started - Online Compiler Import https://github.com/janjongboom/iot-devfest
  29. 29. © 2019 Arm Limited 28 Getting started - Mbed CLI Install Mbed CLI: https://github.com/armmbed/mbed-cli $ mbed import https://github.com/janjongboom/iot-devfest
  30. 30. © 2019 Arm Limited 29 Advanced features RTOS included (KEIL RTX) Event scheduler (Mbed Events) Tickless mode and automatic sleep management Filesystems included (FAT and LittleFS) Memory tracing supported Easy to port!
  31. 31. © 2019 Arm Limited Mbed Labs - forefront of IoT innovation
  32. 32. © 2019 Arm Limited 31
  33. 33. © 2019 Arm Limited 32 http://mbed.com/js
  34. 34. © 2019 Arm Limited 33
  35. 35. © 2019 Arm Limited 34
  36. 36. © 2019 Arm Limited 35 Google: "firmware updates lorawan" https://www.youtube.com/watch?v=0NoshDOqmdM
  37. 37. © 2019 Arm Limited Building something
  38. 38. © 2019 Arm Limited 37 Three approaches Module Radio Radio + MCU Easy to integrate in own design Pre-certified SX1272 or SX1276 Cheaper Need to do own RF design SiP Integrated silicon Not certified Cheap
  39. 39. © 2019 Arm Limited 38 Picking a gateway Kerlink IoT station Multi-Tech Conduit IMST iC880A Lorix One The Things Gateway Lorrier LR2 SX1301 + 2x SX1257
  40. 40. © 2019 Arm Limited 39 Typical LoRaWAN Topology Devices Gateways Network Server User
 ApplicaTon ApplicaTon Server
  41. 41. © 2019 Arm Limited 40 Hands-on, building a network NUCLEO-F411RE SX1272 Multi-Tech Conduit Network Server
  42. 42. © 2019 Arm Limited https://github.com/janjongboom/iot-devfest
  43. 43. Thank You! Danke! Merci! ! ! Gracias! Kiitos! 감사합니다 धन्यवाद © 2019 Arm Limited 43 Jan Jongboom Principal Developer Evangelist jan.jongboom@arm.com

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