ESP-NOW (ESP32) for SuperTeam communication - is it an allowed protocol?

We are evaluating this before adding any new hardware to our robot, and
we think this could be useful for other teams thinking about SuperTeam
communication too!

Rule 6.3 recommends that teams “bring some kind of communication hardware
or think about a communication mechanism”
for the SuperTeam Challenge.

We are considering adding an ESP32-C3 Mini to our robot and using
ESP-NOW as the inter-team communication protocol.

For those unfamiliar, ESP-NOW is a connectionless protocol by Espressif
that allows ESP32 devices to communicate directly without a router, with
very low latency (~1ms) and low power consumption. It operates on 2.4GHz.

  1. Is ESP-NOW an allowed communication protocol for the SuperTeam
    Challenge?
  2. Are there any 2.4GHz frequency restrictions at the venue in
    South Korea we should consider?
  3. Is there a recommended or standard protocol that organizers suggest
    so teams can cooperate more easily regardless of their hardware?

We are aware that ESP-NOW requires both teams to use ESP32 hardware, which
could be a limitation — happy to discuss alternatives if others have
solved this differently!