LORAWAN Error message on uplink when node.downlink() is removed

[RonMeier]

Describe the bug I noticed when testing LoRaWAN_End_Device_Reference.ino in case node.downlink() is taken out as I don't need a downlink It is also no longer possible to send an uplink From the second time the uplink is sent, the error message appears: [LoRaWAN] Sending uplink packet ... failed, code -1108 [LoRaWAN] Waiting for downlink ... failed, code -1108

Expected behavior No waiting for a downlink

Additional info (please complete):

• MCU: tested with ttgo esp32 and heltec esp 32
• Wireless module type SX1276
• Arduino IDE version 1.8.19

[jgromes]

in case node.downlink() is taken out as I don't need a downlink

LoRaWAN requires you to open Rx windows after uplink. Without that, functionality like adaptive data rate will not work.

[RonMeier]

Ok I understand, Thank you very much for your response.