You can use these tools to help analyze packet data, checksums, etc.
To break down hex dumps:
http://rdm.openlighting.org/tools/packet-extractor
To build example packets:
http://rdm.openlighting.org/tools/packet-builder
An EUID analyzer:
http://rdm.openlighting.org/tools/uid-converter
They're very handy tools when you're troubleshooting.