I like the built-in telemetry function. I asked MGM which telemetry systems will be supported and this is the reply I got:

"We will add more telemetry systems asap but it also depends on telemetry producers if they provide their telemetry datasheet - after having datasheet we can add any telemetry system."

These data can be transfered (taken from the preliminary manual):
- main (traction) battery voltage (respectively voltage of lower cell)
- main battery current
- temperature of the battery (when is measured)
- rpm of the motor
- motor temperature (if measured)
- controller temperature
- BEC voltage
- BEC current
- BEC temperature