1. IzoT™ Device Stacks
March 2014

2. IzoT Platform Device Stacks
IzoT Device Stack EX
Free download from iiot.echelon.com
Premium Edition adds SMIP for creating an FT network interface
Develop applications using Python, C++, or C
Stack source code included
1MB Control Stack footprint
Use a Raspberry Pi, BeagleBone Black, or port to processor of your choice
Sample source code and schematics for applications using the Raspberry Pi
IzoT Device Stack DX
Smaller stack for memory-constrained processors such as Marvell 88MC200
70KB Control Stack footprint
IzoT Device Stack AX
Platform-optimized stack for the Series 6000 processors
EX and AX with patented self-installation
Device Stack EX
User C/C++ Application
User Python Application
Python Package
C API
Self-installation Engine
Control Services
Linux UDP/IP Stack
The core of the IzoT Platform are the device stacks. The device stacks provide control services on top of IP that enable devices to discover each other and to easily and reliably exchange data.
There are three device stacks, the full-featured EX stack, a smaller DX stack for memory-constrained devices, and an optimized AX stack for the FT 6050 chip.
The EX stack is available as a free download from Echelon. Using this stack, you can develop IzoT-enabled applications in Python, C++, or C. Full source code for the stack is included in the free download. A reference implementation is included that runs on a Raspberry Pi, BeagleBone Black, or other ARM processors. You can also port the stack to other processors and operating systems.
The stack includes a set of example applications and schematics for the Raspberry Pi that provide a quick start for trying the stack.
SMIP Driver
Ethernet/ Wi-Fi
FT SMIP FT
Echelon Confidential

3. Software Platform Requirements
Processor
32-bit or 64-bit processor including ARM and Pentium
Reference implementations on Raspberry Pi’s Broadcom processor with ARM11 core (ARMv6 architecture) and BeagleBone Black’s TI processor with ARM Cortex A8 core (ARMv7-A architecture)
Operating system
Any operating system supporting the services required by the Operating System Abstraction Layer (OSAL) including Linux and Windows—requires UDP socket and threading support
Reference implementations on Raspberry Pi’s Raspbian and Ubuntu Linux on BeagleBone Black
Memory
Approximately 1MB application memory required for the Device Stack
Non-volatile storage required for persistent data
Implementation languages
IzoT Control Services: C++
C API: C
Python package: Python 3.2

4. IP Channel Implementation
IzoT SDK Beta 1: 2 options based on IP-852
Option 1: Unicast – requires an IP-852 Configuration Server and is limited to 255 devices
Option 2: Multicast (default) – does not require an IP-852 Configuration Server but is limited to a single subnet
Both options tunnel LonTalk packets over UDP/IP
IzoT SDK Beta 2: native IPv4
LonTalk Layers 1 to 3 replaced with UDP/IP over any IP link including Ethernet or Wi-Fi
Network size limited to 32,385 devices
Network can span multiple IP subnets
Application
Control Services
(L3 – L7)
IP-852 Tunnel
UDP/IP
Link Specific L2 & MAC
Application
Control Services
(L4 – L7)
UDP/IP
Link Specific L2 & MAC

5. IzoT Control Services Communication with datapoints
Unicast and multicast addressing
Reliable message delivery – acknowledged and request/response services
Standard profiles and types
Self-installation or commissioning primitives

6. IzoT Control Service Limits
AX Stack
DX Stack
EX Stack
Communication with datapoints
Bytes per datapoint 31
228
Datapoints per application
254
4096
Datapoint aliases per application
8192
Unicast and multicast addressing
Devices per network
32,385
Address table entries per device
32,767
Groups per network
256 or
65,535*
256 or 65,535*
Reliable message delivery
Simultaneous outgoing transactions 2
256
* Enhanced mode only

7. Network Installation Options
Interoperable Self-Installation (ISI)
Device applications discover each other and form communities of devices
No installation tool or platform required
Limited to hundreds of devices and a single channel
Managed installation with OpenLNS or IzoT Network Services Server
Network installation managed by an OpenLNS Server and one or more installation tools such as the OpenLNS Commissioning Tool
Supports up to 32,385 devices per network

8. IzoT Data Model Devices communicate with datapoints
Each datapoint has a datapoint type
Over 200 standard datapoint types are defined
Devices are configured with properties
Each property has a property type
Over 300 standard property types are defined
Datapoints and properties are organized into blocks
Each block is an implementation of a profile
Over 100 standard profiles are defined

9. IzoT Profiles and Types
New IzoT profiles and types are included with the DX and EX stacks that are optimized for IP communication and simplify interoperating with BACnet devices
The new profiles and types are not compatible with the Series 6000 processors
New profiles optimized for IIoT applications
Analog Input and Analog Output
Keypad, Load Control, and Occupancy Sensor
Device Status
New datapoint types optimized for IIoT applications
Including iot_analog, iot_load_control, iot_dev_status, and iot_alarm

10. Device Application Development
Device Stack
C++ or C
C API similar to the Echelon LonTalk Stack
Python
Python classes deal with much of the complexity of implementing and binding datapoints
User C/C++ Application
User Python Application
Python Package
C API
ISI Engine
Control Services
Linux UDP/IP Stack
Ethernet/ Wi-Fi

11. Implementing an IzoT Python Application
Here is the code you would write to implement a sensor based on the IoT Analog Input profile:
import izot.device.application
import izot.resources.profiles.iotAnalogInput
def main():
app = izot.device.application.Application()
app.program_id = ‘9F:FF:FF:05:00:00:00:01’
temperatureSensor = app.block(
profile=izot.resources.profiles.iotAnalogInput.iotAnalogInput() )
def new_output(value):
with temperatureSensor.nvoAnalog:
temperatureSensor.nvoAnalog.data.present_value = value
app.start()
while True:
app.service()
… other application processing …

12. IzoT REST API for Web page and enterprise application development
Web Page Development
Server Stack
IzoT REST API for Web page and enterprise application development
Enables device and datapoint discovery, for example: GET /api/devices
Supports reading and writing datapoints, for example: GET /api/datapoints?name=temperature
REST
Web Pages
Web Server
REST Server
Database
Controller
Collector
Network Server
Control Services
Linux UDP/IP Stack
Ethernet/ Wi-Fi

13. IzoT Platform Example Overview
Occupancy
Luminosity
iPad
Implements a lighting system with color control
Demonstrates peer-to-peer control combined with Web-based monitoring & control
Includes example source code, schematics, and PCB layouts
Temperature / Humidity
IzoT Web Apps
Environmental Sensor
Example
Devices
Touch Keypad
The free IzoT SDK includes an example application that demonstrates how the SDK can be used with Raspberry Pis to create a lighting system with color control. The example demonstrates both peer-to-peer control as well as Web-based monitoring and control.
There are thee example device applications. First is an Environmental Sensor that measures and reports temperature, humidity, occupancy, and light level. Second is a 2.5” touch screen keypad that can be used to control the lighting. Third is an LED Controller that controls up to two 3W RGB LEDs. The example support multiple instances of each device type, so you can have multiple Environmental Sensors and Keypads controlling multiple LEDs.
The Web pages are all implemented using HTML5 and Javascript. They are compatible with all major browsers, and are also optimized when displayed on an iPad.
The example includes source code for the device applications, schematics and layouts for the I/O hardware, and HTML5 and JavaScript code for the Web pages.
IzoT Server
LED Controller
Example Web Pages
Echelon Confidential