I tried the http_test example from the Sodaq_R4X library on a Sodaq Sara R412 AFF. When setting the connection RAT to 2G the example works like expected. When setting RAT to NBIoT there is an error when the +UHTTPC command is sent. Sending data via TCP/UDP socket is working fine when connected via NBIoT. Anyone else experiencing this behaviour?
I also posted a question here: