ng_networking example

Connecting RIOT native and the Linux host

To establish a connection between RIOT and the Linux host, the following dependencies are required:

netcat (with IPv6 support)

Ubuntu 14.04 comes with netcat IPv6 support pre-installed. On Debian it's available in the package netcat-openbsd.

After installing, create a tap interface (to which RIOT will connect) and a bridge (to which Linux will connect):

sudo ip tuntap add tap0 mode tap user ${USER}
sudo ip link set tap0 up

Now you can start the ng_networking example by invoking make term. This should automatically connect to the tap0 interface.

To verify that there is connectivity between RIOT and Linux, go to the RIOT console and run ifconfig:

> ifconfig
Iface  7   HWaddr: ce:f5:e1:c5:f7:5a
inet6 addr: ff02::1/128  scope: local [multicast]
inet6 addr: fe80::ccf5:e1ff:fec5:f75a/64  scope: local
inet6 addr: ff02::1:ffc5:f75a/128  scope: local [multicast]

Copy the link-local address of the RIOT node (prefixed with fe80) and try to ping it from the Linux node:

ping6 fe80::ccf5:e1ff:fec5:f75a%tap0

Note that the interface on which to send the ping needs to be appended to the IPv6 address, %tap0 in the above example. When talking to the RIOT node, you always want to send to/receive from the tap0 interface.

If the pings succeed you can go on to send UDP packets. To do that, first start a UDP server on the RIOT node:

> udp server start 8808
Success: started UDP server on port 8808

Now, on the Linux host, you can run netcat to connect with RIOT's UDP server:

nc -6uv fe80::ccf5:e1ff:fec5:f75a%tap0 8808

You should now see that UDP messages are received on the RIOT side. Opening a UDP server on the Linux side is also possible. Do do that, write down the IP address of the host (run on Linux):

ifconfig tap0
tap0     Link encap:Ethernet  HWaddr ce:f5:e1:c5:f7:59
        inet6 addr: fe80::4049:5fff:fe17:b3ae/64 Scope:Link
        UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
        RX packets:6 errors:0 dropped:0 overruns:0 frame:0
        TX packets:36 errors:0 dropped:0 overruns:0 carrier:0
        collisions:0 txqueuelen:0
        RX bytes:488 (488.0 B)  TX bytes:3517 (3.5 KB)

Then open a UDP server on Linux:

nc -6ul 8808

Now, on the RIOT side, send a UDP packet using:

udp send fe80::4049:5fff:fe17:b3ae 8808 testmessage