Sorry for “reviving” this topic after 2 years but I’m trying to get this specific information right for a thesis I’m writing which involves the use of ChirpStack.
I have examined the last version of the LoRaWAN Regional Parameters document and for what concerns the transmissions, I haven’t found any restriction within the datarates proposed (DR0-DR7).
The only thing that resembles what you are referring to is in the “EU863-870 Receive windows” paragraph, i.e.:
463 By default, the RX1 receive window uses the same channel as the preceding uplink. The data
464 rate is a function of the uplink data rate and the RX1DROffset as given by the following table.
465 The allowed values for RX1DROffset are in the [0:5] range. Values in the [6:7] range are
466 reserved for future use.
Am I missing something and 0-5 should be still considered the range to use in the data rate settings…?