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OpenWeave + Happy Cross Network Multicast Inet Layer HOWTO

View source on GitHub

You have decided that you would like to experiment with cross-network multicast using OpenWeave. This how-to guide illustrates using the Happy network simulation tool to set up a virtual topology that demonstrates using OpenWeave's Inet layer across two distinct networks with a multicast proxy.

Download and build mcproxy

The IPv6 multicast proxy daemon, mcproxy, serves to proxy / forward / route IPv6 multicast traffic across two disjoint IPv6 network links.

While it is not particularly important where you clone and build the mcproxy daemon executable, please take note of the location where you create it as a relative or absolute path to it is necessary in Step 6 below.

git clone https://github.com/mcproxy/mcproxy.git mcproxy
sudo apt-get install qt5-qmake qt5-default
cd mcproxy/mcproxy
qmake
make

Download, build, and install happy

git clone https://github.com/openweave/happy.git happy
sudo apt-get install bridge-utils python-lockfile python-psutil python-setuptools
cd happy
sudo make install

Download and build openweave-core

git clone https://github.com/openweave/openweave-core.git openweave-core
cd openweave-core
./configure
make

Establish the Happy topology

This creates a topology very similar to the Happy Codelab.

happy-network-add ThreadNetwork thread
happy-network-address ThreadNetwork fd00:0000:0000:0006::
happy-network-add WiFiNetwork wifi
happy-network-address WiFiNetwork fd00:0000:0000:0001::
happy-network-address WiFiNetwork 192.168.1.0
happy-node-add ThreadNode
happy-node-add WiFiNode
happy-node-add BorderRouter
happy-node-join ThreadNode ThreadNetwork
happy-node-join WiFiNode WiFiNetwork
happy-node-join BorderRouter ThreadNetwork
happy-node-join BorderRouter WiFiNetwork
happy-network-route --prefix fd00:0000:0000:0006:: ThreadNetwork BorderRouter
happy-network-route --prefix fd00:0000:0000:0001:: WiFiNetwork BorderRouter
happy-network-route --prefix 192.168.1.0 WiFiNetwork BorderRouter

Create the mcproxy configuration for the Happy topology

This creates an IPv6 multicast proxy configuration between the simulated "Thread" network interface on "wpan0" and the simulated "WiFi" network interface on "wlan0" in the Happy topology we created above in Step 4.

While it is not particularly important where you create the mcproxy.conf file, please take note of the location where you create it as a relative or absolute path to it is necessary in Step 6.

cat > mcproxy.conf << EOF
protocol MLDv2;
pinstance myProxy: wpan0 ==> wlan0;
EOF

Run the demonstration

This runs the IPv6 multicast proxy, mcproxy, on the "BorderRouter" node and then launches the Inet layer multicast functional test sender and receiver on the simulated "Thread" and "WiFi" nodes, respectively.

If you'd like, you can transpose the sender and the receiver nodes and the example will work equally as well.

Each of the following sets of commands should be run from parallel, independent shells.

Border router

happy-shell BorderRouter
<path-to-mcproxy-from-step1>/mcproxy -f <path-to-mcproxy-config-from-step5>/mcproxy.conf

Receiver

happy-shell WiFiNode
openweave-core/src/test-apps/TestInetLayerMulticast -6 --udp -I wlan0 -g 5 --group-expected-rx-packets 5 --group-expected-tx-packets 0 -l

Sender

happy-shell ThreadNode
openweave-core/src/test-apps/TestInetLayerMulticast -6 --udp -I wpan0 -g 5 --group-expected-rx-packets 0 --group-expected-tx-packets 5 -L

Output

Sender

openweave-core/src/test-apps/TestInetLayerMulticast -6 --udp -I wlan0 -g 5 ... -L
Weave Node ready to service events; PID: 50845; PPID: 46482
Using UDP/IPv6, device interface: wpan0 (w/o LwIP)
Will join multicast group ff15::5
1/5 transmitted for multicast group 5
2/5 transmitted for multicast group 5
3/5 transmitted for multicast group 5
4/5 transmitted for multicast group 5
5/5 transmitted for multicast group 5
Will leave multicast group ff15::5
WEAVE:IN: Async DNS worker thread woke up.
WEAVE:IN: Async DNS worker thread exiting.
WEAVE:IN: Async DNS worker thread woke up.
WEAVE:IN: Async DNS worker thread exiting.

Receiver

openweave-core/src/test-apps/TestInetLayerMulticast -6 --udp -I wlan0 -g 5 ... -l
Weave Node ready to service events; PID: 50826; PPID: 46499
Using UDP/IPv6, device interface: wlan0 (w/o LwIP)
Will join multicast group ff15::5
Listening...
UDP packet received from fd00::6:8693:b7ff:fe5a:1dc1:4242 to ff15::5:4242 (59 bytes)
1/5 received for multicast group 5
UDP packet received from fd00::6:8693:b7ff:fe5a:1dc1:4242 to ff15::5:4242 (59 bytes)
2/5 received for multicast group 5
UDP packet received from fd00::6:8693:b7ff:fe5a:1dc1:4242 to ff15::5:4242 (59 bytes)
3/5 received for multicast group 5
UDP packet received from fd00::6:8693:b7ff:fe5a:1dc1:4242 to ff15::5:4242 (59 bytes)
4/5 received for multicast group 5
UDP packet received from fd00::6:8693:b7ff:fe5a:1dc1:4242 to ff15::5:4242 (59 bytes)
5/5 received for multicast group 5
Will leave multicast group ff15::5
WEAVE:IN: Async DNS worker thread woke up.
WEAVE:IN: Async DNS worker thread exiting.
WEAVE:IN: Async DNS worker thread woke up.
WEAVE:IN: Async DNS worker thread exiting.