I have a Lopy4 as a LoRa end node connected to the open TTN Stack v3.11.3 and being configured as multicast on the TTN stack. The LoPy operates in class C mode using ABP/multicast activation. When I schedule a downlink to the LoPy it works fine when operating in DR=0 but with other DR like DR1, DR2, etc. the data is not received by the LoPy. Does anyone know what could be the cause of this behavior. (The downlink messages were schedule via MQTT client)
What I have the noticed is that the TTN stack gateway does the transmission on SF12 (DR0) and I guess that might be a reason why the LoPy only receives data only on DR0. If what I think is right, how can I make TTN stack to transmit data using other spreading factors/data rate not only with SF12.