ConstReadonlySymbols2: LorawanCadToRxTwo symbols.
ReadonlySymbols4: LorawanCadToRxFour symbols.
ReadonlySymbols6: LorawanCadToRxSix symbols.
ReadonlySymbols8: LorawanCadToRxEight symbols, which a device assumes before it has heard from a relay.
How many symbols a relay takes from detecting activity to receiving, table 15.