This repository contain a full implementation of the Sparrow application layer protocol and tools needed to make use of it. The implementation is based on Contiki OS and some of the popular platforms are supported from start.

Sparrow is communicating on top of IPv6/UDP and defines an encapsulation format (called encap) that encapsulates different types of payload. The most important payload is the TLV payload. This is used for all of the application data to and from IoT devices running Sparrow. TLVs consist of type, length and values and are fairly similar to OMA TLVs used in OMA LWM2M.

The application layer also defines an object model where each IoT device can present a number of object instances at runtime. There is a discovery procedure to discover the number of objects that any IoT device implements and their type. All Sparrow devices have instance 0 which is a management and discovery instance. Instance 0 includes one variable that describes the number of instances available on this device and knowing the instance count, all other instances can be discovered (e.g. read out type of object and other parameters).

Sparrow Application Layer is released under BSD 3-Clause License.

Design by Yanzi Networks. Main contributors:

Lars Ramfelt lars.ramfelt@yanzinetworks.com
Stefan Sandhagen stefan.sandhagen@yanzinetworks.com
Fredrik Ljungberg flag@yanzinetworks.com
Oriol Piñol Piñol oriol.pinol@yanzinetworks.com
Marie Lassborn marie.lassborn@yanzinetworks.com
Simon Gidlund simon.gidlund@yanzinetworks.com

The work on preparing the Sparrow Application Layer for open source release have been done by Niclas Finne and Joakim Eriksson, SICS Swedish ICT (nfi@sics.se and joakime@sics.se).

Start by checking out needed submodules. Contiki OS is included as a git submodule and some of the Contiki OS submodules are also needed.

> cd sparrow
> git submodule update --init --recursive

There is an example application included for testing with Zolertia RE-MOTE. To begin with, the RE-MOTE needs to be programmed with a rescue image that contains the Sparrow bootloader. The RE-MOTE can always be reprogrammed again using the serial bootloader so it is no problems reprogramming the RE-MOTE later with another non-Sparrow application.

> cd examples/zoul/remote
> make IMAGE=1
> make rescue-image

Make sure the RE-MOTE is connected via USB

> make upload-rescue-image

Now the RE-MOTE should be running an example application where it is possible to control the LEDs and listen to the user button using the Sparrow application layer. Make sure you have a border router running and wait for the RE-MOTE to connect to your network before trying to communicate with the node.

Start by creating an image archive for OTA. An image archive contains both images which makes it easy for the upload tool to simply upload the image for the container that is currently not used in the node.

NOTE: Remember to always increase the INC number when recompiling during each day to mark the newly compiled image as newer than the previous image. If both images have the same date and same INC, the first one will be used when booting.

 > cd examples/zoul/remote
 > make images INC=0
 > make upload-fast DST=<IP-address-of-the-RE-MOTE-node>

The make rule upload-fast can be used for faster update of locally connected (single hop) nodes. The make rule upload uses a slower update process that should be used for multihop networks or to avoid affecting the network during updates.

During bootup, before the application is started, the Zoul RE-MOTE will blink once if booting on the first image, and twice if booting on the second image.