SENA ProBee-ZU10 - Manual (Page 27)

27 ProBee-ZU10 User Guide Rev.1.5
3.5.1 Security Level
In order to use security in the application, a user should set security level using the AT command below.
Set 1 defines both Authentication and Encryption at the network layer. Set 0 defines no security. Disabling
security in the application is not ZigBee compliant. All nodes in the network should have the same
security level setup. The security level is configured using the AT command below.
AT+SECURITY=n or AT+SE=n,, where n is encryption level. (0=disable, 1=enable)
3.5.2 Link Key
The trust center (normally coordinator in network) requests link key before a device is trying to join
network. If link key the device has is wrong, joining process will be denied. Hence, all nodes in the
network should have the same link key setup before joining the network.
AT+LINKKEY=xxx … xxx or AT+LK= xxx … xxx, where xxx … xxx is 128-bit hexadecimal trust center link key.
Default is FFF … FF.
3.5.3 Network Key
It is the network-wide key used to secure transmissions at the Network Layer. The network key encrypts
all transmissions at the Network Layer. The network key only needs to be set up for the coordinator.
AT+NWKKEY=xxx … xxx or AT+NK=xxx … xxx, where xxx … xxx is 128-bit hexadecimal network key.
Default is FFF … FF.
3.5.4 Update Key
A trust center can update the Network Key to help minimize the risk associated with a particular instance
of the network key being compromised. Key updates are broadcast by the trust center throughout the
network, encrypted using the current network key. Devices that hear the broadcast will not immediately
use the key, but simply store it. Later, a key switch is broadcast by the trust center to tell all nodes to start
using the new key. At a minimum, the trust center should allow adequate time for the broadcast of the
new key to propagate throughout the network before switching.
AT+UPDATEKEY or AT+UK
3.6 Frequency Agility
Frequency Agility refers to the function to shift operating channel to avoid interference. To perform the
frequency agility function, the network manager monitors communication failures, decides to changes the
operating channel and send message to indicate the channel change. Other nodes in the network move
to the designated channel by responding to the message.
Even though ZU10 cannot be a network manager, ZU10 implements the frequency agility function by