How to verify downlink data

Just managed to send downlink data to the device from the api POST /api/devices/{devEUI}/queue got the response as 200 :grinning: see the pic for info

but cmdline for app server iam getting
’ grpc: addrConn.resetTransport failed to create client transport: connection error: desc = “transport: Error while dialing dial tcp operation was canceled”; Reconnecting to {localhost:8000 }’

see the pic for info

Please let me how to check in the device if I have received the packets.My device is Lorawan powered by raspberry pi

It seems like LoRa App Server doesn’t connect the LoRa Server.

Make sure your LoRa Server running in the host