Section 5.5.1 T4:
"Teams may not set up their own 802.11a/b/g/n/ac (2.4GHz or 5GHz) wireless communication (e.g.
access points or ad-hoc networks) in the venue.
A wireless hot spot created by a cellular device is considered an
access point."
Bluetooth is 802.15. To my knowledge, the manual doesn't mention anything about Bluetooth in the stands or pits for scouting or networking purposes
Source:
Wikipedia