Downlink time out (AT_RX_TIMEOUT) when relaying via a NBX R1000-RF repeater.

[peterj43]

We have recently been doing some work with Sigfox repeater(NBX R1000-RF) with B-L072Z-LRWAN1, to help us reach some areas not covered by the Sigfox network. The messages being routed via the repeater uplink messages were being relayed to the Sigfox backend but downlink messages to the B-L072Z-LRWAN1 timed out returning AT_RX_TIMEOUT. We do not have this issue with the Arduino MkrFox1200. Logging in to the web interface for the repeater it is possible to see that the NBX in receiving the downlink messages and it has forwarded them to the device. The Sigfox backend sees the data as delivered and is acknowledged. For development we have been using a "Sigfox Access Station Micro" as we don't have direct access to the Sigfox network from our location we have no issue with uplinks or downlinks with this set up the problem only manifests itself when we use the NBX repeater.