Table of Contents
Advertisement
Work with networked devices
The device you use to send FN transmits a zero-hop broadcast to all of its immediate neighbors. All of
the devices that receive this broadcast send an RF packet to the device that transmitted the FN
command. If you sent FN remotely, the target devices respond directly to the device that sent the FN
command. The device that sends FN outputs a response packet in the same format as an
Command Response frame -
Trace route option
In many networks, it is useful to determine the route that a DigiMesh unicast takes to its destination;
particularly, when you set up a network or want to diagnose problems within a network.
Note
Because of the large number of Route Information Packet frames that a unicast with trace
route enabled can generate, we suggest you only use the trace route option for occasional diagnostic
purposes and not for normal operations.
The Transmit Request (0x10) frame contains a trace route option, which transmits routing
information packets to the originator of the unicast using the intermediate nodes.
When a device sends a unicast with the trace route option enabled, the unicast transmits to its
destination devices, which forward the unicast to its eventual destination. The destination device
transmits a Route Information Packet (0x8D) frame back along the route to the unicast originator.
The Route Information Packet frame contains:
Addressing information for the unicast.
n
Addressing information for the intermediate hop.
n
Other link quality information.
n
For a full description of the Route Information Packet frame, see
0x8D.
Trace route example
Suppose that you successfully unicast a data packet with trace route enabled from device A to device
E, through devices B, C, and D. The following sequence would occur:
After the data packet makes a successful MAC transmission from device A to device B, device A
n
outputs a Route Information Packet frame indicating that the transmission of the data packet
from device A to device E was successful in forwarding one hop from device A to device B.
After the data packet makes a successful MAC transmission from device B to device C, device B
n
transmits a Route Information Packet frame to device A. When device A receives the Route
Information packet, it outputs it over its serial interface.
After the data packet makes a successful MAC transmission from device C to device D, device C
n
transmits a Route Information Packet frame to device A (through device B). When device A
receives the Route Information packet, it outputs it over its serial interface.
After the data packet makes a successful MAC transmission from device D to device E, device D
n
transmits a Route Information Packet frame to device A (through device C and device B). When
device A receives the Route Information packet, it outputs it over its serial interface.
There is no guarantee that Route Information Packet frames will arrive in the same order as the
route taken by the unicast packet. On a weak route, it is also possible for the transmission of Route
Information Packet frames to fail before arriving at the unicast originator.
XBee®/XBee-PRO XTend Compatible (XTC) DigiMesh RF Module User Guide
0x88.
Test links between adjacent devices
AT
Route Information Packet frame -
103
Advertisement
Table of Contents
