If you read section
4.3.1 Robot Wireless Control in the rules, you will see that wireless networks are prohibited anyway.
Quote:
Teams are not allowed to set up their own 802.11a/b/g/n (2.4GHz or 5GHz) wireless communication (access points or ad-hoc networks) in the venue
Note that a wireless hot spot created by a cellular device would be considered an access point, and thus not allowed
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This is probably made to prevent the wireless networks from interfering with the FMS, but could also be due to the fact that many arenas have vendor-supplied wifi and could have urged FIRST to make this rule. Either way, you shouldn't setup a wireless network at a event (unless it's a bluetooth PAN).
Because of this rule, our team has setup a completely wired network using a Apache2 server running on a laptop and a router to connect to other laptops which scouts use. However, we ran into issues with getting power at our last regional and needed to fall back on our paper system.