upon closer look I don't see how waiting while Check network registration < 6 would make any sense. The command, I guess that it issues, is: AT+CREG which would yield something like: +CREG: 0, 1 if connected to the home network or +CREG: 0, 5 in case of roaming.

You could add a print of the result code of check network registration to see the value you get. If it's 1 or 5 then the modem is registered to the network and you could change the code accordingly.

BTW: Interestingly on the product page there is a Chinese version of the UIFlow code which omits the registration check. (I wonder why.)

Thanks
Felix

I assume you're trying the MQTT Test example? Yes?

I think the command Check network registration is confused about the echo sent from the modem.

Try moving the command Set command echo mode off before the command Check network registration. E.g. move it right after the command Check module status.

Thanks
Felix