My Gateway is RAK7268V2, and my Network Server is built-in network server.
I check the status again via AT+CLASS after five minutes of sending uplink packet. It still returns AT+CLASS=B:S3.
This could be related to the gateway. I never got Class B to work with a gateway without GPS. It has something to do with exact time information that the gateway requires for Class B function.
More a question for the gateway section.
I posted the same question at LPWAN Industrial Gateway, but no relevant staff member has replied to me.
So, which gateway with GPS uses the built-in server to get the class B functionality working? I need to buy a new gateway to complete my experiment.