SIM7080 Long connection

Connectivity LTE Cat-M1 & NB-IoT
1

Hi everyone,

I have a SIM7080G module. The connection does not seem constant. Sometimes, in 2 seconds I am connected to the network and sometimes, it will take 10 minutes. I’m wondering if the AT commands I’m sending are in the correct order or relevant. Could anyone help me?
My module sleeps and wakes up every 5 to 10 min, once awake, I send the following commands (I check the errors, I don’t put the responses to simplify reading):
AT+CFUN=1
AT+COPS=0
AT+CNMP=38
AT+CMNB=1
AT+CGREG? => wait for response +CGREG: 0.5 or +CGREG: 0.1 => sometimes it’s instantaneous and sometimes it takes more than 10 min
AT+CNCFG=0.1, “hologram”
AT+CGDCONT=1,“IP”,“hologram”
AT+CGNAPN
AT+CNACT=0.1

Is there a problem in the sequence?

AT +CSQ => AT+CSQ\r\r\n+CSQ: 22.99\r\n\r\nOK\r\n

Thank you for your help

2

I’m seeing the same issue. Have you figured this out?

3

Hi, yes, I found a solution. I don’t understand how the other modules can work correctly because no one specifies that it is important to select the frequencies of the country where we are so that the network search can be done more quickly. You must use the following command for France:
AT+CBANDCFG=“CAT-M”,3,20,1,28

I hope this could help

4

That’s great news. Thank you so much!