Hi,
I have noticed a bug in the vesc 6 firmware. If you use an external nrf module via the comms port, it will not connect to the nrf nunchuck unless you hit "write app conf" in vesc tool.
This is what happens (with the nrf settings already configured).
1. Turn on power to vesc
2. Press button on NRF nunchuck (nothing happens, it doesn't connect)
3. Connect vesc to computer and hit hit "Write App Configuration" in the nrf tag (not changing any values)
4. NRF nunchuck will now connect.