we are using a Quectel chip to connect to the NB-IoT network. Now we are making first attempts on the connection. We proceeded step by step according to the “NarrowBand IoT Quick Start Guide” and came till here:
#Now data is sent through the open socket to the gateway server with IP
#172.25.102.151 on port 1883. 29 bytes of data are sent. The sent data represents
#a MQTT-SN CONNECT query to the Cloud of Things gateway server. This should
#be acknowledged by the server by sending a CONNACK (hex: 030500). The data
#should be sent as usual in the hex string format. Exchanging <IMSI> and <PW> by
#one of your valid IMSI/Password combinations, formatted in hex strings, should
#result in the described behavior. at+nsost=0,”172.25.102.151”,1883,29,”1D0404010384<IMSI><PW>”
Unfortunatelly it was not possible to connect to the server via command: at+nsost=0,”172.25.102.151”,1883,29,”1D0404010384<IMSI><PW>” It works neither with hexadecimal converted strings, nor the IMSI and PW as ASCII. We don’t know what should stay istead of <IMSI><PW> What should be entered in there? In response, we always got only one error and we tried pretty much all variants, whether converted, normal, with <> or without etc …
Can you explain in simple words how to build the command set that works?
Currently I have the feeling that in principle a connection can be established otherwise the previous registration steps would have already failed and thus we have network coverage in Tettnang - which is very good. Unfortunately, it has not been possible to register yet.
I’m looking forward to a quick help