Atmel AVR2070 6.5 Sensor App Example

28 AVR2070 8240B-AVR-06/09

When setting an IP address, the full IP address must be specified with all zeros

present. If the address is short any bytes, the node will respond “length error”.

The 'server address' is the IP address which the node automatically sends readings

to. The 'button press address' is the IP address which the node sends a certain

message to only when the button is pressed.

The 'G' command returns a timestamp in front of the last received message. This

timestamp is in milliseconds, and is a 16-bit value. Hence there will be a range of 0 –

65536, after which point the timestamp will overflow back to zero.

As a simple first example, a wireless node will be setup to ping the connected

computer. This assumes the computer's IPv6 address is

2001:db8:1e1::459d:ff:fe29:bcf5.

C:\> nc6 -u 2001:db8:1e1:1:baad:ff:fe00:1 61618 <enter>

D2001:0db8:01e1:0000:459d:00ff:fe29:bcf5 <enter>

BP <Enter>

H <enter>

G <enter>

[10293] Ping took 13 mS

Note that when the 'H' command is issued, this is no different from just hitting the

button on the node.

Next let's assume there was another node on the network, and the first node wanted

to query the temperature on the second node. The following commands would cause

the first node to send the 'T' command to the second node whenever the button is

pressed. The 'G' command is then used to receive the data the second node sent the

first.

C:\> nc6 -u 2001:db8:1e1:1:baad:ff:fe00:1 61618 <enter>

D2001:0db8:01e1:0001:baad:00ff:fe00:0002 <enter>

BST <Enter>

H <enter>

G <enter>

[12313] T22.3

6.5 Sensor App Example

The RUM example described in section 5 uses the RUM networking layer to pass

messages around. This allows end nodes to communicate with the coordinator to

exchange sensor readings, calibration data, etc. With IPv6 support enabled however,

these messages can then be passed along an IPv6 link instead.