Thanks Dan,
I've managed to setup Wireshark and grab some traffic:
18 8.881541 192.0.0.64 192.0.0.128 TFTP 84 Read Request, File: digicap.dav, Transfer type: octet, timeout=5, blksize=512
19 8.882507 192.0.0.128 192.0.0.64 TFTP 74 Error Code, Code: File not...